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| IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 Features VS CONTR General * Minimum number of inexpensive external components * Auto shutdown in case of over temperature with internal or external temperature sensor * Small package allows compact module design with minimised wire runs and short connections to achieve improved EMI performance * MLX10801 is offered in 2 package options: SOIC8 and MLPD8 5x5. The MLPD8 5x5 package option allows to take out a higher peak and average current than the SOIC8 package option LED driver High energy efficiency Light control via PWM possible Light output has a minimized dependency on supply and temperature variations * Adjustable LED parameters are stored in an internal NV memory * * * GND TEST CALIB 10801 (SO8) DRVOUT RSENSE DSENSE VS GND TEST CALIB CONTR DRVOUT RSENSE DSENSE MLX10801 (M LPD8 5x5) Coil driver * Additional use for driving coils like relays and micro valves in a power saving mode * Works with a wide range of coils * * Electronic fuse Additional use as electronic fuse. Fuse current adjust possibility Ordering Information Part Nr MLX10801 MLX10801 Temperature Code R (-40C to 105C) R (-40C to 105C) Package Code DC (SOIC8) LDC (MLPD8 5x5) General Description The MLX10801 is a multi-purpose LED driver for high power LEDs designed for automotive applications. A lot of adjustment possibilities allow for the design of different LED applications using only a few external components. The circuit is load dump protected for a 40V load dump pulse. As a second use, a variety of coils like relays and micro valves can be driven in a very efficient power saving mode. A third use is a simple electronic fuse, to protect circuits from overcurrent or overtemperature. 3901010801 Author: TFR Page 1/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 Table of content Features............................................................................................................................... 1 Ordering Information............................................................................................................ 1 General Description ............................................................................................................. 1 Table of content ................................................................................................................... 2 Block diagram ...................................................................................................................... 4 1. Typical application data............................................................................................. 5 1.1. LED driver applications .................................................................................... 5 1.1.1. Complete schematic LED driver diagram .................................................... 5 1.1.2. Minimum schematic LED driver diagram ..................................................... 5 1.1.3. LED driver application notes ........................................................................ 6 1.1.3.1. LED driver application notes for MLX10801 in MLPD8 5x5 .................. 7 1.2. Coil driver applications ..................................................................................... 8 1.2.1. Coil driver schematic diagram ..................................................................... 8 1.2.2. Coil driver application notes......................................................................... 8 1.3. Electronic fuse applications.............................................................................. 9 1.3.1. Electronic fuse schematic diagram .............................................................. 9 1.3.2. Electronic fuse application notes ................................................................. 9 2. Application pins ....................................................................................................... 10 3. Absolute maximum ratings ..................................................................................... 11 4. Electrical characteristics ......................................................................................... 13 5. EE-Latch characteristics ......................................................................................... 16 6. ESD/EMI recommendations for MLX10801............................................................ 16 7. Automotive test pulses............................................................................................ 17 7.1. Test pulse definition ....................................................................................... 18 8. LED driving principle ............................................................................................... 21 8.1. General........................................................................................................... 21 8.2. The principle in detail ..................................................................................... 22 8.3. Coil inductance, EMI and selected parameter set.......................................... 23 8.4. Switching frequency considerations and constant light output....................... 25 9. Coil driving principle ................................................................................................ 26 9.1. General........................................................................................................... 26 9.2. The principle in detail ..................................................................................... 26 10. Electronic fuse principle .......................................................................................... 26 11. Sleep mode............................................................................................................. 27 12. Temperature shutdown........................................................................................... 27 13. Load dump protection ............................................................................................. 27 14. The calibration ........................................................................................................ 27 14.1. The internal control register ........................................................................... 27 14.2. The Influence of the pseudo random generator to the monoflop time ........... 29 14.3. The calibration interface................................................................................. 30 14.4. The calibration procedure .............................................................................. 31 14.4.1. Calibration procedure for LED driver applications ................................. 31 14.4.2. Calibration procedure for coil driver applications:.................................. 32 14.4.3. Calibration procedure for electronic fuse applications:.......................... 32 15. Data content of delivered parts ............................................................................... 33 16. Mechanical Data ..................................................................................................... 34 16.1. Mechanical data of the MLX10801 in SOIC8 ................................................. 34 16.2. Mechanical data of the MLX10801 in MLPD8 5x5 ......................................... 35 16.3. Melexis standard soldering information.......................................................... 38 17. History record.......................................................................................................... 39 3901010801 Author: TFR Page 2/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse 18. Disclaimer ............................................................................................................... 41 MLX10801 3901010801 Author: TFR Page 3/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 Block diagram VS GND CONTR VDD VDD Regulator POR Sleep Reference 3V+/-5% POR DAC COMP Debouncing time 32ms Debouncing 1us FF COMP POR CLK CLK Start Programmable devider: not used;/1;/2;/4;/8;/16;/32 Delay POR Divider / 1024 1 MHz oscillator 3 Bit devider selection for delay generation after POR 6 Bit Free running counter Stop Monoflop 6 Bit Compare register as programmable Monoflop EELatch Jitter 3 Bit Johnson counter for jitter on monoflop time CLK EE-Latches DRVOUT Hysteresis VDD DAC VDD CALIB Tresh. detect. Serial interface EELatch COMP EELatch RSENSE TEST Testmode detect. Digital Testmode DSENSE 3901010801 Author: TFR Page 4/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 1. Typical application data 1.1. LED driver applications 1.1.1. Complete schematic LED driver diagram VBAT Cap for EMC directly on the connector 100nF...1uF 10...100uF 100nF Calibration point CONTROL 47k optional Cap for EMC reduction VS GND TEST Calibration point CALIB CONTR DRVOUT RSENSE Calibration points DSENSE GND Diode only needed, in case temperature shut off is done with an external diode temperature sensor 1.1.2. Minimum schematic LED driver diagram VBAT Cap for EMC directly on the connector 100nF...1uF 10...100uF 100nF Calibration point 47k VS GND TEST Calibration point CALIB CONTR DRVOUT RSENSE Calibration points DSENSE GND 3901010801 Author: TFR Page 5/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse 1.1.3. LED driver application notes The MLX10801 is optimised for the use of low cost coils. For a standard application with 1 LED and an average current of 350mA a coil of about 100H...470H having 1R omic resistance should be chosen. The sense resistor should have a value between 0.47R...1R / 250mW. As a general rule: the higher the load current, the lower the inductance of the coil should be, since higher currents lengthen the charging time of the coil. Switching frequencies lower than 20kHz are often not desired. It is possible (without manipulating the internal IC trimming data) to set the peak current and the average current of the LED by a variation of sense resistor and coil value. The same can be achieved by programming a modified parameter set to the EEPROM of the IC. The free wheel diode that carries the load current during the passive state (driver OFF) should be a very fast switching diode like ES1D or BYG80 with a recommended trr<30ns in order to avoid parasitic spikes on RSENSE. The diode must be able to carry the current flowing in the LED. For applications that use an external temperature sensor, virtually any low cost diode with a temperature coefficient of -2mV/K can be used. In case of longer lines between the IC and the coil (which should be avoided because of EMI), a capacitor might be placed in parallel to RSENSE to avoid crosstalk and parasitic switching. A well chosen parameter set can help to avoid such a condition. The goal should be to unload the coil as much as possible during the selected monoflop time (see as well chapter 8.3). The schematic diagram under 1.1.1 is used in applications, where the LED is controlled by external control electronics. A PWM with a frequency between 30Hz..4kHz can be applied to the CONTROL pin in order to dim the light output. This frequency is limited by the debouncing time for the sleep mode on the lower side and the selected monoflop time on the upper side of that range. This function can be used to achieve different light outputs or also be used in a temperature down regulation. It is recommended to have the PWM frequency at least 5-10 times lower than the selected driver switching frequency. The minimum schematic diagram under 1.1.2 is sufficient for all applications with a constant light output. Nevertheless a dimming function could be achieved by a PWM driving directly on the module supply. In this mode, the PWM frequency should be chosen between 0 and 1kHz. It is limited by the maximum IC settling time. MLX10801 3901010801 Author: TFR Page 6/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 1.1.3.1.LED driver application notes for MLX10801 in MLPD8 5x5 The MLX10801 assembled in a MLPD8 5x5 package allows to take out of the IC a higher average and a higher peak current. The pre calibration data of the MLX10801 in all types of packages is identical. In order to take advantage of the bigger output current capability without changing the ICs pre trimmed parameter set, the user can change the values of the coil and the sense resistor. A typical LED average current of approx. 700mA can be achieved by using a coil of 220uH and a sense resistor of 0,3 Ohm. In case of such typical high current applications, the user must provide a suitable heat sink possibility on the PCB. Changing the pre calibrated data, which is stored in the internal EEPROM, allows to tune the IC also to other coil and sense resistor values, the EMC performance can be influenced as well. Please check as well out the MLX10801 application notes for different driving solutions, which allow to drive more than one high power LED on a single MLX10801. 3901010801 Author: TFR Page 7/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 1.2. Coil driver applications 1.2.1. Coil driver schematic diagram Cap for EMC directly on the connector VBAT 10...100uF 100nF Calibration point 47k optional cap for EMC reduction VS GND TEST Calibration point CALIB CONTR DRVOUT RSENSE RF COIL Calibration points DSENSE RSENSE GND CF 1.2.2. Coil driver application notes The purpose of this application is to drive a coil in a power saving efficient way using a switched mode power supply. Coils of 10mH...5H can be driven. Attention has to be drawn to the maximum allowed current which must not be exceeded. In case of high inductive coils and/or longer cables between the IC and the coil, CF and RF might be needed for reducing electromagnetic emissions. When the driver switches on, the coil still contains a certain amount of energy, which is connected to a high voltage on node COIL. Via the RDSon of the driver this voltage together with switching oscillations is then coupled to RSENSE. If these switching oscillations do not disappear within the debouncing time of the comparator (typically 1s) the driver is switched off immediately, an effect known as "parasitic switching". A solution to that could be: * CF, RDSon+ RF form a filter * CF only acts in case the driver switches ON (in the OFF state it is quickly discharged by RSENSE) * RDSon + RF should be larger than RSENSE * RSENSE and CF must be directly connected to pin RSENSE * CF and RF must be figured out in the application. However, typical start values are RF=0 (not used) and CF=1.5uF. 3901010801 Author: TFR Page 8/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 The idea is to decouple the node COIL from RSENSE so that the switch off voltage can not be reached. Thus, parasitic switching is avoided. Instead of using RF and CF, "parasitic switching" can also be avoided by a well chosen parameter set (see also chapter 8.3) and a well designed PCB that avoids switching oscillations. Note: Melexis designed in a debouncing time of 1s to the internal comparator due to the fact that the MLX10801 can be used with a wide range of inductances. 1.3. Electronic fuse applications 1.3.1. Electronic fuse schematic diagram VBAT 10...100uF 100nF Calibration point CONTROL 47k RL VS GND TEST Calibration point CALIB CONTR DRVOUT RSENSE Calibration points DSENSE GND 1.3.2. Electronic fuse application notes The purpose of this application is the protection of an external load against overcurrent. In this mode, the switch mode regulator is disabled. The driver is permanently ON as long as the current remains below a specified level. Once this level is reached, the driver switches OFF and remains OFF until a POR is given. A shutdown of the module due to overtemperature is also achievable if the internal or external temperature sensor is used. 3901010801 Author: TFR Page 9/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse 2. Nr. 1 2 3 4 5 6 7 8 MLX10801 Application pins Name VS GND TEST CALIB DSENSE RSENSE DRVOUT CONTR Function Supply Voltage Ground MELEXIS test pin for test modes enable Serial clock/data for end of line programming External diode pin for temperature measurement and temperature shutdown condition External sense resistor pin for peak current detection Driver output Light control input, ON/OFF or dimming via PWM signal, sleep mode possibility 3901010801 Author: TFR Page 10/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 3. Absolute maximum ratings Symbol vs iprot Condition DC max. 2h max. 0.5s In case of maximum supply ratings without external resistor protected with external 47k resistor Min -0.3 -0.3 -0.3 -10 Max 28 36 40 10 Unit V V V mA Parameter Power supply Maximum input current in protection circuitry on any pin Maximum input voltage on CONTR vicontr -0.3 18 V -40V (0.5s) 40 (0.5s) V Maximum input voltage on RSENSE, DSENSE, TEST Maximum input voltage on CALIB Maximum input voltage on DRVOUT vilv vicalib vdrvoutmax with load DC max. 2h max. 0.5s -0.3 -0.3 -0.3 -0.3 -0.3 vdd+0,3 18 28 36 40 550 400 V V V V V mA mA A mA C C C C C C Maximum peak current on DRVOUT for MLX10801 in SOIC8 Maximum average current on DRVOUT for MLX10801 in SOIC8 Maximum peak current on DRVOUT for MLX10801 in MLPD8 5x5 Maximum average current on DRVOUT for MLX10801 in MLPD8 5x5 Maximum junction temperature Lifetime Dynamic In case of EE Latch write Storage temperature Ambient temperature range ipkdrvout iavgdrvout ipkdrvout iavgdrvout tjunc -40 -40 -40 -55 tambient -40C *) *) 1.2 750 130 150 85 125 150 (100h) 105 3901010801 Author: TFR Page 11/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 Thermal resistance junction to ambient for MLX10801 in SOIC8 Thermal resistance junction to ambient for MLX10801 in MLPD8 5x5 (Under consideration of the thermal application notes for MLPD packages published under www.carsem.com ) rth rth *) 120 37 K/W K/W *) The parameters are only valid, in case the specified rth is insured by having a suitable heat sink capability on the PCB. 3901010801 Author: TFR Page 12/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 4. Electrical characteristics Following characteristics are valid - for the full temperature range of T = -40C to +105C, - a supply range of 28V VS > 6V - and the IC settling time after power on reset unless other conditions noted. With 6V VS > vporh analog parameters can not be guaranteed. Note: The correct operation of the MLX10801 as a switching mode power supply for voltages lower than the nominal supply voltage is dependent on the forward bias voltage of the used LED. The user must ensure that at low supply voltage the peak current threshold voltage on the RSENSE pin can be reached in order to keep the switching principle working. If several pins are charged with transients above VS and below GND, the sum of all substrate currents of the influenced pins should not exceed 10mA for correct operation of the device. Normal operating supply voltage is supposed to be 13.8V. Parameter Symbol Conditions Min Maximum current during 40V load dump Normal supply current at highest DC voltage Normal supply current Sleep mode current ihv inomdch inom isleep Global parameters VS=40V CONTR=H VS=28V CONTR=H VS=13.8V CONTR=H VS=13.8V Chip in sleep T=25C IC settling time Limits Typ Units Max 10 4 2 105 mA mA mA A IC settling time after tsettle power on reset IC settling time after wake tssettle up 300 300 s s Oscillator related parameters The min/max specification influences directly all derived timings in the same deviation Oscillator frequency fosc (frequency can 0.7 1.0 1.3 MHz only be adjusted by Melexis during final parts test) Debouncing time for sleep mode Debouncing time on tdebsleep 32 ms CONTR for sleep mode Wake up time twakeup 8 s 3901010801 Author: TFR Page 13/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 RESET related parameters (Reset is 5.0 connected to the internal VDD, but vporh is measured on pin VS) VDD related parameters (VDD stays only internal) 5V supply voltage range vdd VS=13.8V 4.0 5.5 Monoflop related parameters Monoflop time tmon specified under 14.1 Delay time generation for current reduction after power on reset Delay time tdelay specified under 14.1 DAC reference related parameters DAC reference voltage vdacref 2,75 3 3,25 RSENSE related parameters Input leakage current ileakrsense DRVOUT is -5 5 switched off Minimum threshold vrsensemin specified under 14.1 voltage on RSENSE of a given step Maximum threshold vrsensemax specified under 14.1 voltage on RSENSE of a given step 1) 1) Stability of a selected step vrsensestab 3 -3 due to temperature and supply influence and long term drift DSENSE related parameters Output leakage current ileakdsense CONTR=0 -5 5 Output current for idsense CONTR=1 80 120 temperature measure(current can only ment be adjusted by Melexis during final parts test) Minimum temperature vdsensemin specified under 14.1 shutdown voltage on pin DSENSE of a given step Maximum temperature vdsensemax specified under 14.1 shutdown voltage on pin DSENSE of a given step Hysteresis between vdsensehyst 13 35 shutdown and switch on for a selected trimming step 1) 1) Stability of a selected step vdsensestab 3 -3 due to temperature and supply influence and long term drift Power on reset level, if VS is ramped up vporh V V V A % A A mV % 3901010801 Author: TFR Page 14/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 Temperature shutdown related parameters for the internal temperature sensor Forward bias voltage of vfwdrt idsense trimmed 630 660 690 mV internal diode at 25C Forward bias voltage of vfwdht idsense trimmed 460 490 520 mV internal diode at 105C CONTR related parameters Input leakage current ileakcontr -5 5 A Comparator digital vin5vhcontr 0.6*vdd 0.65*vdd 0.7*vdd V threshold level L => H, switching point vdd=5V 3 3.25 3.5 V Comparator digital vin5vlcontr 0.3*vdd 0.35*vdd 0.4*vdd V threshold level H => L, switching point vdd=5V 1.5 1.75 2 V DRVOUT related parameters Input leakage of DRVOUT ileakdrvout -5 5 A when switched off On resistance of rdsdrvout 1.4 DRVOUT @Tj=150C CALIB related parameters Pull down resistance of rpdcalib 5 10 20 k pin CALIB 1) Guaranteed by design 3901010801 Author: TFR Page 15/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 5. EE-Latch characteristics The NV memory carrying the trimming information is composed of an EEPROM latch. The data, that is written to this latch during final parts programming at Melexis or by the customer, is permanently stored in this latch, even after the chip is powered down. Data retention 20 years 25C permanent ambient 20 years 55C permanent ambient 10 years 85C permanent ambient 125C permanent ambient 1 year 6. * * * * * ESD/EMI recommendations for MLX10801 In order to minimise EMI, the PCB has to be designed according to EMI guidelines. Additional components may be needed, other than what is shown in the application diagrams, in order to comply with the EMI requirements. The MLX10801 is an ESD sensitive device and has to be handled according to EN100015 part 1. The MLX10801 will fulfil the requirements in the application according to the specification and to DIN 40839 part 1. The MLX10801 is designed with ESD protection >1000V HBM according to MIL883D. After ESD stress, the sleep mode current (specified in chapter 4) of the component can not be guaranteed anymore. 3901010801 Author: TFR Page 16/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 7. Automotive test pulses The following chapter is valid for a completely assembled module. That means, that automotive test pulses are applied to the module and not to the single IC. In the recommended application according to chapter 1, the reverse polarity diode together with the capacitors on the supply and the load dump protected IC itself protects the module against the automotive test pulses listed below. The exact values of the capacitors for the application have to be figured out according to the automotive and EMI requirements. No damage occurs for any of the test pulses. A deviation of characteristics is allowed during pulse 1, 2, 4; the module returns to normal operation after the pulse without any additional action. During test pulse 3a, 3b, 5 the module operates within characteristic limits. Test condition, Functional status Transient test pulses in accordance to DIN40839 part 1&3 and ISO7637 part 1&3, IC pin CONTR connected to IC pin VS via 47k, module schematics are according to application notes. Module acts as a single light source Test pulse #1 at module pin VBAT, GND vpulse1 -100 0 V 5000 pulses, functional state C Test pulse #2 at module pin VBAT, GND vpulse2 0 100 V 5000 pulses functional state C Test pulse #3a at module pin VBAT, GND vpulse3a -150 0 V 1h, functional state A Test pulse #3b at module pin VBAT, GND vpulse3b 0 100 V 1h, functional state A Test pulse #4 at module pin VBAT, GND vspulse4 -6 -4 V 1 pulse, vapulse4 -5 -2,5 V functional state C Test pulse #5 at module pin VBAT, GND vpulse5 26,5 86,5 V 1 pulse clamped to <=40V functional state C, Description of functional status: A: All functions of the module are performed as designed during and after the disturbance. B: All functions of the module are performed as designed during and after the disturbance: However, one or more can deviate from specified tolerance. All functions return automatically to normal limits after exposure is removed. Memory functions shall remain class A. C: A function of the module is not performed as designed during disturbance but returns automatically to a normal operation after the disturbance Parameter Symbol Min Max Dim 3901010801 Author: TFR Page 17/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 7.1. Test Pulse 1 Ri = 10R V Test pulse definition 200ms <100 12V 10% t vpulse1 90% 1s 2ms 0.5s...5s Test pulse 2 Ri=10R V 0.5...5s 50s 1s 90% vpulse2 10% 12V 200ms t 3901010801 Author: TFR Page 18/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse Test Pulse 3a Ri = 50R V MLX10801 10ms 12V 90ms t vpulse3a 100s 100ns 5ns 10% 90% Test Pulse 3b Ri = 50R V 100s vpulse3b 12V 10ms 90ms 90% t 10% 5ns 100ns 3901010801 Author: TFR Page 19/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 Test Pulse 4 (Cranking) Ri = 0.01R V 12V vspulse4 vapulse4 5ms 15ms 50 ms 0.5-20s 100 ms t Test Pulse 5 (Load Dump) Ri = 0.5...4R (clamped to 40V during test) V 90% vpulse5 40V Pulse 5 Pulse 5 at device 10% 12V t tr = 0.1...10ms td = 40...400ms 3901010801 Author: TFR Page 20/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 8. LED driving principle 8.1. General The LED is driven by a switched mode power supply using an inductor as the energy storage element. This method has several advantages. The supply voltage has to be set down to the forward bias voltage of the LED. In ordinary applications this is achieved by a resistor with the following drawbacks: A resistor dissipates power which is transformed to heat Efficiency is reduced drastically The light output of the LED is dependent on the supply and the temperature of the resistor The MLX10801 avoids this disadvantages as the following calculation shows (all values according to the Melexis demo board EVB10801,standard configuration with L=220H, RSENSE =0.47R): Supposed: Vbat = 13.8V VfLED 3.4V IfLED 350mA Vf1 0.7V (reverse polarity diode) Vf2 0.7V (free wheel diode) VRSENSE 0.4V (@IfLED, RSENSE=0.47R) VRDS ON 0.3V (@IfLED) VCoil 0.2V (@IfLED) Efficiency using a simple resistor: Efficiency n: n = VfLED / Vbat 25% Efficiency using the MLX10801: The following calculation is an approximation only, due to the fact the coil current is not constant. It is therefore calculated with average currents. 1) During OFF time, the coil acts as the storage element and puts its energy to the free wheel diode and the LED: n1 = VfLED / (VfLED+ Vf2+ VCoil) 79% 2) During ON time, current flows through the reverse polarity diode, LED, coil , FET driver and RSENSE, which causes the following voltage drops: n2= VfLED / (VfLED +Vf1 +VCoil +VRDS ON +VRSENSE ) 68% 3) ON and OFF times are in ratio of roughly 40:60 Efficiency n: n = (n1*0.4 + n2*0.6) = 72.4% Measurements have given an efficiency of about 70% and confirm this estimation. Note, that the ratio of ON and OFF time depends on many factors like supply voltage, coil inductance, forward bias voltage etc. and is therefore an application specific value. For ordinary applications, efficiency ranges from about 65% - 75%. 3901010801 Author: TFR Page 21/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse 8.2. The principle in detail MLX10801 The driver is switched on until a maximum current through the LED is reached. This maximum current is programmable by the customer. After reaching the maximum current, the driver is switched off for an adjustable monoflop time that is formed by a counter compare unit. The monoflop time is also programmable by the customer. Both parameters, the peak current threshold voltage and the monoflop time, create an ON/OFF period to form an average current through the LED. By programming these parameters, an adjustment of the average load current is possible in a wide range. Note: The current sense comparator has a typical debouncing time of 1s as shown in the block diagram. This delay time prevents the driver from being switched off due to short term switching oscillations etc. When working with very short monoflop times this time has to be taken into account for calculations. I Imax Iavg tmon t Note: The circuit is active only in case CONTR=H. By applying a PWM signal on CONTR, the LED can be dimmed from 0% to 100%. CONTR=0 CONTR=PWM CONTR=H LED with 0% LED dimmed with PWM LED with 100% Dimming can also be achieved by applying a PWM directly to the module supply. IC settling times have always to be considered in PWM mode. Please refer also to chapter 1.1.3 for additional PWM frequency considerations. With a configuration bit, a pseudo random generator can be applied to the last 3 LSBs of the 6 setting bits for the monoflop time. The pseudo random generator runs with the clock derived out of the monoflop time and adds a random distribution on these 3 LSBs. Therefore, the monoflop time gets a random variation from its trimmed value. This occurs in every monoflop period. It will influence the average current in the same manner. By using this jitter mode feature, the EMI behaviour of the complete module is improved, due to the variation of the otherwise fixed switching frequency. Please refer to 14.2 for additional information. 3901010801 Author: TFR Page 22/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 jitter mode 8.3. Coil inductance, EMI and selected parameter set The inductance L of a coil describes the amount of magnetical energy that can be stored in it. Consequently, high inductive coils will be discharged less than low inductive coils in a given time. Generally the coil can be driven in two different ways: 1) The coil will only be discharged partially. That means the coil still carries a significant amount of energy when going from discharging to charging. In that moment the charging current rises immediately to the coil current that was flowing just before switching. This is connected with large dI/dt transients on the RSENSE pin that have a negative impact on EMI. The coil will be discharged completely. Thus, at the end of a discharging cycle, the coil doesn't carry energy anymore. With the next charging cycle, current increases steadily from around zero. This way, large dI/dt transients are completely avoided. Care has to be taken when working in jitter mode. In this case, monoflop time (=discharging time) is not constant but varies in a certain range (see chapter 14.2 for details). It must be ensured that only the longest possible monoflop time completely discharges the coil. Otherwise the coil is discharged before the monflop time ends which results in a loss of efficiency. I Imax2 tmon2 2) Imax1 Iavg tmon1 t Conclusion: In most cases the coil is driven in a combination of both ways. A tradeoff has to be made between EMI behaviour and maximum allowed LED current. By varying these parameters, an optimum can be found for virtually every application. 3901010801 Author: TFR Page 23/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 Below are some examples for typical parameter sets given for a 350mA LED current and the following application data: Standard application used according to 1.1.1: * * * RSENSE = 0.47R (1R) LED: Luxeon LXHL-MW1C L = 220H, 470H L=470H, RSENSE=1R ;Selection of temperature sensor (1-internal). Bit[19]. 1 ;Jitter enabled (1-enabled). Bit [18]. 1 ;Delay after POR. Bits [17:15]. 000 ;Temperature shut off. Bits [14:10]. 01001 ;TMonoflop time. Bits [9:4]. 100100 ;Peak current. Bits [3:0]. 1111 w L=220H, RSENSE=0.47R ;Selection of temperature sensor (1-internal). Bit[19]. 1 ;Jitter enabled (1-enabled). Bit [18]. 1 ;Delay after POR. Bits [17:15]. 000 ;Temperature shut off. Bits [14:10]. 01001 ;TMonoflop time. Bits [9:4]. 011100 ;Peak current. Bits [3:0]. 0111 w L=100H, RSENSE=0.47R ;Selection of temperature sensor (1-internal). Bit[19]. 1 ;Jitter enabled (1-enabled). Bit [18]. 1 ;Delay after POR. Bits [17:15]. 000 ;Temperature shut off. Bits [14:10]. 01001 ;TMonoflop time. Bits [9:4]. 001100 ;Peak current. Bits [3:0]. 0111 w 3901010801 Author: TFR Page 24/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse 8.4. Switching frequency considerations and constant light output MLX10801 As already shown, the switching frequency depends on the peak current as well as on the monoflop time for a given coil. Furthermore it depends on the coil inductance itself. Due to the principle of switch mode power supplies, the current through the LED is kept constant for any supply changes. The parameter that changes in order to keep the current constant is the switching frequency itself. The lower the supply voltage, the lower the switching frequency. Furthermore, the supply current is affected by supply changes: with an increasing supply voltage the average supply current decreases. Melexis delivers the MLX10801 with a pre-trimmed parameter set according to chapter 15, where an average switching frequency for a supply voltage of 13.8V is given. The graph below shows the relative luminous flux versus the power supply for a typical application. The luminous flux at 14V has been set to 100%. The graph indicates that the light output is not as dependent on supply changes. MLX10801 with Luxeon LXHL BBO1, blue Relative Luminous Flux Tv/Tv(14V) =f(Vbat) 1,07 1,06 1,05 1,04 1,03 Tv/Tv(14V) 1,02 1,01 1,00 0,99 0,98 0,97 10 12 14 16 18 20 22 24 26 28 30 Vbat [V] 3901010801 Author: TFR Page 25/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 9. Coil driving principle 9.1. General Coils like relays or micro valves consume a relatively large amount of energy. At the moment of switching on, energy is needed in order to switch a relay or a micro valve to the ON position. Once this position is reached, the energy can be reduced drastically, while still keeping the mechanics of the relay or micro valve activated. 9.2. The principle in detail After power on reset, a delay time tdelay can be enabled, which disables the peak current detection during that time. This delay time can be selected as described in 14. The maximum current Imax that can flow during tdelay, is just dependent on the omic resistance of the selected coil. After tdelay, the trimmed configuration is valid and the current drops down to the trimmed current value Iavg. Due to the fact that the inductance of relays and micro valves is quite high, the monoflop operation in the range of microseconds does not have much of an impact on the average current. So, in this configuration the selected peak current is nearly the same as the average current. The monoflop time should be selected according to the inductance of the selected coil and for the best EMI behaviour. I Imax tmon Iavg tdelay t 10. Electronic fuse principle The principle is very simple. The monoflop will not be used and stays deselected. This way, the driver is always on and the current of a given load is sensed by RSENSE. If it exceeds the specified limit or the selected shutdown temperature, the module will be switched off. It can only be switched on again by a power on reset to the system or by reducing the module temperature. 3901010801 Author: TFR Page 26/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 11. Sleep mode In case CONTR=0 for t>tdebsleep, the MLX10801 goes to sleep mode, which reduces the IC current drastically. Only the internal regulator and the input comparator for CONTR are still working. In case CONTR=1 again, the chip is waken up after t>twakeup. The settling time for wake up, given in chapter 4, has to be considered. 12. Temperature shutdown The temperature shutdown feature can be enabled or disabled. In case it is enabled, an internal or external diode can be used as temperature sensor. The internal temperature sensor is used to protect the chip (FET driver) from overtemperature. If the adjustable temperature shutdown voltage, which is in fact the forward bias voltage of the diode, is reached, the IC shuts down. An external temperature sensor is usually used to protect the load (LED) from overtemperature. Therefore it should be thermally connected to the load. Between the temperature shutdown and release point, there is a hysteresis in order to avoid oscillations. When this point is reached, the IC automatically returns to its normal mode. The hysteresis is specified in chapter 4. The thermal behaviour of the system should be characterised during the design-in of the product by the customer. The chip can be programmed for a fixed temperature shutdown voltage thereafter during the end of line programming. For a system that is designed for thermal conditions, temperature shutdown may not be needed. In this case, the temperature shutdown can be disabled completely. 13. Load dump protection The MLX10801 is protected against 40V load dump, in case the application proposals described under 1 are used. 14. The calibration 14.1. The internal control register The internal control register consists of the following bits. Bits are shifted in from MSB to LSB, starting with Bit19 and ending with Bit0. 3901010801 Author: TFR Page 27/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse Nr of Bits 4 Bits 0...3 Scope Peak current shutdown calibration data. The DAC behaviour is monotonic. vrsensetyp stepwide is 30mV Bits vrsensemin vrsensetyp vrsensemax 3 2 1 0 0 0 0 0 -10 % 90 mV +10 % 0 0 0 1 -10 % 120 mV +10 % ... 1 1 1 1 -10 % 540 mV +10 % Monoflop time calibration data. Bits Monoflop time tmon 9 8 7 6 5 4 0 0 0 0 0 0 Monoflop disabled 0 0 0 0 0 1 1 s 0 0 0 0 1 0 2 s ... 1 1 1 1 1 1 63 s Temperature shutdown calibration data. The DAC behaviour is monotonic. vdsensetyp stepwide is 10mV Bits vdsensemin vdsensetyp vdsensemax 14 13 12 11 10 MLX10801 Remark 6 4...9 5 10...14 3 15...17 0 0 0 0 0 Temperature shutdown disabled 0 0 0 0 1 -10 % 300mV +10 % 0 0 0 1 0 -10 % 310mV +10 % ... 1 1 1 1 1 -10 % 600mV +10 % Delay generation after power on reset for current reduction. Bits Delay time tdelay 17 16 15 1 1 4 5 5 18 19 20...23 24...28 29...33 0 0 0 Delay time generation disabled 0 0 1 1 ms 0 1 0 2 ms 0 1 1 4 ms 1 0 0 8 ms 1 0 1 16 ms 1 1 0 32 ms 1 1 1 64 ms Bit cleared Bit set Pseudo random generator is Pseudo random generator is NOT applied to the monoflop applied to the monoflop time time generation. generation. External diode temperature Internal temperature diode sensor is used at DSENSE. sensor is used at DSENSE. Temperature shutdown current source calibration data. Oscillator frequency calibration data. DAC reference calibration data. Only adjustable by Melexis 3901010801 Author: TFR Page 28/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 14.2. The Influence of the pseudo random generator to the monoflop time Code dez dez 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 Code bin bin 000001 000010 000011 000100 000101 000110 000111 001000 001001 001010 001011 001100 001101 001110 001111 010000 010001 010010 010011 010100 010101 010110 010111 011000 011001 011010 011011 011100 011101 011110 011111 100000 100001 100010 100011 100100 100101 100110 100111 101000 101001 101010 101011 101100 101101 101110 101111 110000 110001 110010 110011 110100 110101 110110 110111 111000 111001 111010 111011 111100 111101 111110 111111 Monoflop- Jitter Jitter Time min max [us] [us] [us] 1 1 7 2 1 7 3 1 7 4 1 7 5 1 7 6 1 7 7 1 7 8 8 14 9 8 14 10 8 14 11 8 14 12 8 14 13 8 14 14 8 14 15 8 14 16 16 22 17 16 22 18 16 22 19 16 22 20 16 22 21 16 22 22 16 22 23 16 22 24 24 30 25 24 30 26 24 30 27 24 30 28 24 30 29 24 30 30 24 30 31 24 30 32 32 38 33 32 38 34 32 38 35 32 38 36 32 38 37 32 38 38 32 38 39 32 38 40 40 46 41 40 46 42 40 46 43 40 46 44 40 46 45 40 46 46 40 46 47 40 46 48 48 54 49 48 54 50 48 54 51 48 54 52 48 54 53 48 54 54 48 54 55 48 54 56 56 62 57 56 62 58 56 62 59 56 62 60 56 62 61 56 62 62 56 62 63 56 62 1/ MonoflopTime [kHz] 1000,0 500,0 333,3 250,0 200,0 166,7 142,9 125,0 111,1 100,0 90,9 83,3 76,9 71,4 66,7 62,5 58,8 55,6 52,6 50,0 47,6 45,5 43,5 41,7 40,0 38,5 37,0 35,7 34,5 33,3 32,3 31,3 30,3 29,4 28,6 27,8 27,0 26,3 25,6 25,0 24,4 23,8 23,3 22,7 22,2 21,7 21,3 20,8 20,4 20,0 19,6 19,2 18,9 18,5 18,2 17,9 17,5 17,2 16,9 16,7 16,4 16,1 15,9 1/Jitter 1/Jitter max min [kHz] [kHz] 1000,0 142,9 1000,0 142,9 1000,0 142,9 1000,0 142,9 1000,0 142,9 1000,0 142,9 1000,0 142,9 125,0 71,4 125,0 71,4 125,0 71,4 125,0 71,4 125,0 71,4 125,0 71,4 125,0 71,4 125,0 71,4 62,5 45,5 62,5 45,5 62,5 45,5 62,5 45,5 62,5 45,5 62,5 45,5 62,5 45,5 62,5 45,5 41,7 33,3 41,7 33,3 41,7 33,3 41,7 33,3 41,7 33,3 41,7 33,3 41,7 33,3 41,7 33,3 31,3 26,3 31,3 26,3 31,3 26,3 31,3 26,3 31,3 26,3 31,3 26,3 31,3 26,3 31,3 26,3 25,0 21,7 25,0 21,7 25,0 21,7 25,0 21,7 25,0 21,7 25,0 21,7 25,0 21,7 25,0 21,7 20,8 18,5 20,8 18,5 20,8 18,5 20,8 18,5 20,8 18,5 20,8 18,5 20,8 18,5 20,8 18,5 17,9 16,1 17,9 16,1 17,9 16,1 17,9 16,1 17,9 16,1 17,9 16,1 17,9 16,1 17,9 16,1 Monoflop-Time=f(code) 70 60 50 Monoflop-Time [us] 40 30 Monoflop-Time [us] Jitter min [us] Jitter max [us] 20 10 0 0 10 20 30 40 50 60 70 Code 1/Monoflop-Time=f(code) 1200,0 1000,0 1/Monofloptime / kHz 800,0 600,0 400,0 200,0 0,0 0 10 20 30 40 50 60 70 1/Monoflop-Time [kHz] 1/Jitter max [kHz] 1/Jitter min [kHz] Code 3901010801 Author: TFR Page 29/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 In case the pseudo random generator is enabled, a random value is applied to the 3 LSBs of the trimmed monoflop time. The table above shows the relation between programmed monoflop time and the minimum/maximum jitter, which can be seen in the related diagrams. All values are typical values. Note, that this is not the drivers switching frequency but only the discharging cycle of a full switching period. 14.3. The calibration interface The calibration interface consists of two blocks: The calibration pin (threshold detection) and the serial interface. The calibration pin is a multi level pin and handles the following functions: sending clock and data to the serial interface latching the data to the EE-Latches programming the data to the EE-Latches The pin itself is pulled down internally. On pin CALIB, comparators are connected with the following threshold levels: Threshold level Scope 0 Normal application mode 3*VS/10 Detects a logic "L" and generates a clock pulse 5*VS/10 Detects a logic "H" and generates a clock pulse 7*VS/10 Latches the data from the serial interface to the EE-Latches and generates a clock pulse. Data is not stored permanently but will be immediately used 9*VS/10 Programmes the data permanently to the EE-Latches and generates a clock pulse. Attention: * A write cycle has to take 4ms...6ms. The user has to insure this time in order to guarantee the specified EE-Latch data retention. * Note, that the interface is fully static, thus only the threshold level is important. However, the maximum transmission rate is limited to 20kBaud, which allows 50s/bit. * Note, that the CALIB pin needs to be left open (internally pulled down) in normal application mode. If the threshold for programming is reached mistakenly (e.g. by applying VBAT to pin CALIB), random data of the internal registers of the serial interface will be programmed to the EE-Latches! It is even better to pull down CALIB hard to GND after programming to avoid fail programming * It is not possible to write a single bit to the EEPROM. A programming cycle always consists of ALL bits of the scan chain. 3901010801 Author: TFR Page 30/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse Following graph shows the driving of the pin and the modes: V(CALIB) MLX10801 VS 9*VS/10 4*VS/5 7*VS/10 3*VS/5 5*VS/10 2*VS/5 3*VS/10 1*VS/5 1*VS/10 0V t Clock Data Data=H Data=L L L L L H H L L Scan in Latch data and try the application Scan in of new data Latch and try data in the application Data is O.K. and will be programmed to the EELatch, Intervall of 4ms...6ms 14.4. The calibration procedure The simple end of line calibration algorithms described below give the possibility to use only * VS, * GND, * CALIB as communication interface. No other signals need to be driven. However, depending on the application requests, other calibration algorithms which stimulate RSENSE and/or DSENSE are also possible. 14.4.1.Calibration procedure for LED driver applications An end of line calibration of LED modules is recommended due to the variation in brightness of high power LEDs at a given current. Assembled modules need to have the CALIB pin available for programming by the customer during the end of line programming. Optical feedback, such as a light meter, can be used during the end of line calibration for the adjustment of the LED brightness. 3901010801 Author: TFR Page 31/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse The following configuration parameters are trimmed using a configuration, that has been figured out during the design in phase: A) B) C) D) E) F) Monoflop time Jitter enabled or disabled Temperature shutdown voltage Internal or external temperature sensor used Delay generation after power on reset disabled The following algorithm can be used for the configuration of the LED module: A start value for the peak current threshold voltage is used. It is loaded and latched via CALIB together with the data above. A power on reset is applied and the application is started. The light output is measured and a new code for the peak current threshold voltage is calculated. The new code is loaded and latched via CALIB together with the data above. The routines C)...E) are executed until the specified light output is reached. MLX10801 14.4.2.Calibration procedure for coil driver applications: The module is assembled completely. End of line programming is performed at the customers side. The CALIB pin must be available for programming. An ampere meter is connected in the supply line of the module. The following configuration parameters are uploaded using a configuration, that has been figured out during the design in phase: Peak current threshold voltage Monoflop time Delay generation after power on reset Jitter enabled or disabled Temperature shutdown voltage Internal or external temperature sensor used The following algorithm can now be used: A) The parameters above are uploaded and latched via CALIB. B) A power on reset is applied and the application is started. C) The relay or micro valve current is measured and must be in spec after tdelay. 14.4.3.Calibration procedure for electronic fuse applications: The module is assembled completely. End of line programming is performed at the customers side. The CALIB pin must be available for programming. The following configuration parameters are uploaded using a configuration, that has been figured out during the design in phase: Peak current threshold voltage Monoflop (stays deselected) Delay generation after power on reset (is switched off) Jitter (stays disabled) 3901010801 Author: TFR Page 32/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse Temperature shutdown voltage Internal or external temperature sensor is used MLX10801 The following algorithm can now be used: A) The parameters above are uploaded and latched via the CALIB pin. B) A power on reset is applied and the application is started. C) The application is working. Adding additional current to the load will switch off the load if the sum of both currents is larger than the trimmed limit. 15. Data content of delivered parts All parts delivered to a customer have the following default parameter set, which had been programmed to the IC during Melexis' final part test. It is up to the user to modify this data depending on application requests (see also chapter 14). Application diagram according to 1.1.1: * RSENSE = 0.47R, * L= 220H, * LED: Luxeon LXHL-MW1C. Meaning Average current Resulting average switching frequency (jitter mode enabled) at 13.8V Parameter iavg fdrvout Type 350 24 Unit mA kHz Delay generation switched off Jitter mode enabled Internal temperature sensor selected, calibrated to 150C IC junction temperature for thermal IC protection The related parameter set file looks like following: ;Selection of temperature sensor (1-internal). Bit[19]. 1 ;Jitter enabled (1-enabled). Bit [18]. 1 ;Delay after POR. Bits [17:15]. 000 ;Temperature shut off. Bits [14:10]. (code 9 = 380mV). 01001 ;TMonoflop time. Bits [9:4]. (code 28 = 28s) 011100 ;Peak current. Bits [3:0]. (code 7 = 300mV) 0111 w 3901010801 Author: TFR Page 33/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 16. Mechanical Data 16.1. Mechanical data of the MLX10801 in SOIC8 DIMENSIONS MIN. .061 .004 .055 .0138 .0075 .189 .150 .230 .010 .016 0 .085 INCHES NOM. .064 .006 .058 .016 .008 .194 .155 .050 .236 .013 .025 5 .093 MILLIMETERS MAX .068 .0098 .061 .0192 .0098 .196 .157 .244 .016 .035 8 .100 Note MIN. 1.55 0.127 1.40 0.35 0.19 4.80 3.81 5.84 0.25 0.41 0 2.16 NOM. 1.63 0.15 1.47 0.41 0.20 4.93 3.94 1.27 5.99 0.33 0.64 5 2.36 MAX 1.73 0.25 1.55 0.49 0.25 4.98 3.99 6.20 0.41 0.89 8 2.54 A A1 A0 B C D E e H h L oc X Degrees 3901010801 Author: TFR Page 34/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse 16.2. Mechanical data of the MLX10801 in MLPD8 5x5 MLX10801 3901010801 Author: TFR Page 35/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 3901010801 Author: TFR Page 36/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 3901010801 Author: TFR Page 37/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 16.3. Melexis standard soldering information This Melexis device is classified and qualified regarding soldering technology, solderability and moisture sensitivity level, as defined in this specification, according to following test methods: * * * * * * IPC/JEDEC J-STD-020 Moisture/Reflow Sensitivity Classification For Nonhermetic Solid State Surface Mount Devices (classification reflow profiles according to table 5-2) EIA/JEDEC JESD22-A113 Preconditioning of Nonhermetic Surface Mount Devices Prior to Reliability Testing (reflow profiles according to table 2) CECC00802 Standard Method For The Specification of Surface Mounting Components (SMDs) of Assessed Quality EIA/JEDEC JESD22-B106 Resistance to soldering temperature for through-hole mounted devices EN60749-15 Resistance to soldering temperature for through-hole mounted devices MIL 883 Method 2003 / EIA/JEDEC JESD22-B102 Solderability For all soldering technologies deviating from above mentioned standard conditions (regarding peak temperature, temperature gradient, temperature profile etc) additional classification and qualification tests have to be agreed upon with Melexis. The application of Wave Soldering for SMD's is allowed only after consulting Melexis regarding assurance of adhesive strength between device and board. Based on Melexis commitment to environmental responsibility, European legislation (Directive on the Restriction of the Use of Certain Hazardous substances, RoHS) and customer requests, Melexis has installed a Roadmap to qualify their package families for lead free processes also. Various lead free generic qualifications are running, current results on request. For more information on Melexis lead free statement see quality page at our website: http://www.melexis.com/html/pdf/MLXleadfree-statement.pdf 3901010801 Author: TFR Page 38/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 17. Rev. 1 2 History record No. 1 1 2 3 4 5 6 7 8 1 1 2 1 2 3 4 5 6 7 1 2 3 4 5 1 2 1 2 3 4 1 1 2 3 4 1 2 3 4 5 6 7 8 1 2 3 4 Change Creation IC settling times added Minimum application diagram added Efficiency calculation had been corrected Calibration of the monoflop time had been changed Debouncing time on CONTR for going to sleep mode added Maximum ambient temperature for chip operation set to 105C rth of the SOIC8 inserted, inomdch added vs, ihv, inom, rdsdrvout adjusted Pseudo random generator on the monoflop time added in order to improve EMI Changes due to coil driver applications and electronic fuse applications tbds have been defined Device number MLX10801 assigned Typing mistakes corrected Maximum supply ratings now at 28V for industrial micro valve applications tssettle set to 300us, -vbe replaced to -0.3V, ihv (typical) removed Reset related parameters adjusted Hysteresis for the temperature shutdown has been put in the block diagram CALIB related parameters added to the electrical characteristics Possible caps added for EMI improvement Calibration procedure adjusted Gain stages out of the RSENSE and DSENSE path have been removed DSENSE is in tristate in case the internal temperature sensor is used Twakeup=8us introduced in order not to wake up in case of HF on the pin CONTR Pins DSENSE and RSENSE exchanged: pinning had been finalised Melexis standard soldering information added uF Capacitor added on the supply line for automotive test pulses Chapter to automotive test pulses added Data set added, which is stored in the devices to be delivered to a customer Forward bias voltage vfwdlt replaced by vfwdrt Exchange of the pin order of CALIB and TEST Chapter "Data content of parts to be delivered" redefined: values, conditions Application remark to the free wheel diode added: fast recovery time Chapter "Switch frequency considerations" added Pull down resistance on CALIB adjusted Application schematics adjusted according to EMI results Some additional application remarks have been added iavgdrvoutr as parameter removed Mechanical package drawings inserted Application remarks for the PWM frequency added Correction of the efficiency calculation Relation between trimmed monoflop time and pseudo random generator jitter has been added Por levels adjusted Spec of idsense adjusted Chapter coil driver applications adjusted: "parasitic switching", CF, RF introduced Graph "relative luminous flux versus power supply" has been added Calibration procedure adjusted Page 39/41 revised: RAH/SSZ Date 21.09.01 27.09.01 3 4 5 04.10.01 19.10.01 16.11.01 6 15.01.02 7 8 14.02.02 11.03.02 9 10 15.05.02 10.07.02 11 27.09.02 12 16.11.02 3901010801 Author: TFR Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse 5 6 1 2 3 4 5 6 7 8 9 1 2 1 1 2 3 4 1 1 1 2 3 4 1 2 1 2 3 vdsensehyst specified as absolute voltage ipeak removed as a specified value for the parts to be delivered Block diagram because of coil driving principle adjusted LED driver and coil driver application diagrams and -notes have been adjusted Remark to MLX10801 applications below nominal supply voltage has been added vfwdrt, vfwdht specified rdsdrvout, vdd, vporh, idsense, vdsensehyst respecified; vporhyst removed Chapter "Coil inductance, EMI and selected parameter set" has been added Coil driving principle adjusted Influence of the pseudo random generator to the monoflop time adjusted Trimming algorithms simplified Addition of Ordering Information and Disclaimer Layout changes Adjustment of the parameter set of the parts to be delivered. Definition of the coil value and sense resistor, to what this parameter set will fit. vpor, isleep, vdacref, fosc respecified Added remark, that the comparator on RSENSE is debounced with typ. 1s Added remark, that high voltage on Calib will program the IC as already shown in the timing diagram ESD respecification according to HBM Idsense, vfwdht respecified Explanations refined, example calculation adapted Typing mistakes as well as formatting errors corrected Working current changed to supply current in table electrical characteristics "Johnson counter" corrected to "pseudo random generator" Figure jitter mode corrected to true start-up behaviour and jitter "Preliminary" statement removed Melexis standard soldering information exchanged Specification for the package option MLX10801 in MLPD8 5x5 has been worked in, as well. For both versions there is now only one specification valid. Exchange of SOIC8 package drawings for better visibility Absolute maximum ratings: 36V for max 2h added as condition, vdrvoutmax respecified MLX10801 13 27.02.03 14 15 16 15.03.03 25.03.03 29.10.03 17 18 19 29.10.03 10.12.03 11.02.04 20 21 14.05.04 14.07.05 3901010801 Author: TFR Page 40/41 revised: RAH/SSZ Rev 021 14/July/05 IC specification Power LED driver for automotive applications Power saving low side coil driver Electronic fuse MLX10801 18. Disclaimer Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Melexis reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with Melexis for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by Melexis for each application. The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interrupt of business or indirect, special incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of Melexis' rendering of technical or other services. (c) 2002 Melexis NV. All rights reserved. For the latest version of this document, go to our website at: www.melexis.com Or for additional information contact Melexis Direct: Europe and Japan: Phone: +32 13 61 16 31 E-mail: sales_europe@melexis.com All other locations: Phone: +1 603 223 2362 E-mail: sales_usa@melexis.com QS9000, VDA6.1 and ISO14001 Certified 3901010801 Author: TFR Page 41/41 revised: RAH/SSZ Rev 021 14/July/05 |
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