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| 2-Phase Excitation SMA7036M 2-Phase Stepper Motor Unipolar Driver IC sAbsolute Maximum Ratings Parameter Motor supply voltage Control supply voltage FET Drain-Source voltage TTL input voltage SYNC terminal voltage Reference voltage Sense voltage Output current Power dissipation Channel temperature Storage temperature Ambient operating temperature Symbol VCC VS VDSS VIN VSYNC VREF VRS IO PD1 PD2 Tch Tstg Ta Ratings 46 46 100 -0.3 to +7 -0.3 to +7 -0.3 to +7 -5 to +7 1.5 4.0 (Ta=25C) 28 (Tc=25C) 150 -40 to +150 -20 to +85 Units V V V V V V V A W W C C C sElectrical Characteristics Parameter Control supply current Symbol min Ratings typ 10 VS=44V 24 VS=44V, IDSS=250 A 0.6 ID=1A, VS=10V 1.1 ISD=1A 250 VDSS=100V, VS=44V 2 ID=1A 0.8 VDSS=100V 2 VDSS=100V 0.8 ID=1A 1 VS=44V, VI=0 or 5V 4.0 Synchronous chopping mode 0.8 Asynchronous chopping mode 0.1 VS=44V, VYS=5V -0.1 VS=44V, VYS=0V 0 Reference voltage input 4.0 Output FET OFF 1 No synchronous trigger 40 Resistance between GND and REF terminal at synchronous trigger 1.5 VS=24V, ID=1A 0.5 VS=24V, ID=1A 0.9 VS=24V, ID=1A 0.1 VS=24V, ID=1A 12 VS=24V 5.5 2.0 V mA V V V max 15 44 Units mA V V V V AC characteristics IS Condition Control supply voltage VS FET Drain-Source VDSS voltage Condition VDS FET ON voltage Condition VSD FET diode forward voltage Condition IDSS FET drain leakage current Condition VIH Condition Active H VIL Condition VIH IN terminal Condition Active L VIL Condition II Input current Condition VSYNCH Condition Input voltage VSYNCL Condition SYNC terminal ISYNCH Condition Input current ISYNCL Condition VREF Input Condition voltage VREF Condition REF terminal IREF Input Condition current RREF Internal resistance Condition Ton Condition Tr Condition Switching time Tstg Condition Tf Condition TOFF Condition 10 100 A DC characteristics A A s Chopping OFF time s 12 SMA7036M 2-Phase Stepper Motor Unipolar Driver IC (2-Phase Excitation) SMA7036M sInternal Block Diagram 1 6 5 8 14 10 15 IN A IN B Vs 1, 6, 10, 15pin Description of pins Reg. Oscillator MOSFET gate drive circuit Synchronous chopping circuit Reg. Chopping blanking timer (5 s typ) + - Oscillator MOSFET gate drive circuit Synchronous chopping circuit Chopping blanking timer (5 s typ) + - 1pin 6pin 10pin 15pin Excitation input Active H Active L OUT A OUT A OUT A OUT A OUT B OUT B OUT B OUT B Chopping OFF timer (12 s typ) Chopping OFF timer (12 s typ) SYNC A SYNC B REF A REF B GND A GND B 7 Rs A 2 4 3 13 12 11 9 sDiagram of Standard External Circuit (Recommended Circuit Constants) Vcc (46V max) + Excitation signal time chart 8 VS 2 SyncA SMA7036M Vb (5V) 11 PchMOS r1 RsA 7 Rs RefA RefB 3 13 RsB 9 Rs GA 4 GB 12 SyncB INB 14 INB INA 5 INA 1 6 10 15 Rs B 2-phase excitation clock INA INB 0 H L 1 H H 2 L H 3 L L 0 H L 1 H H : r1 : r2 RS (1 to 2W) : PchMOS : Inv : 8k 2k (VR) 1 typ HN1J02FU (Toshiba) 7404 r2 Inv Disable (High Active) SMA7036M 13 2-Phase Stepper Motor Unipolar Driver IC (2-Phase Excitation) SMA7036M sExternal Dimensions (Unit: mm) Epoxy resin package 310.2 10.20.2 30 40.2 2.50.2 3 0.6 1.20.1 (5.9) (7.5) 1.6 0.6 0.620.1 1.160.15 P2.030.1x14=28.42 12 3 * * * * * * * 15 1 2 3 * * * * * * * 15 (4.6) 0.55 -0.1 +0.2 8.5max Lot No. Part No. 1.450.15 6.7 0.5 (9.7) +0.2 +0.2 0.65 -0.1 1.16 +0.2 -0.1 0.55 -0.1 40.7 P2.030.1x14=28.42 31.3 +0.2 Forming No. No.1054 (3) Forming No. No.1055 14 SMA7036M 2-Phase Stepper Motor Unipolar Driver IC (2-Phase Excitation) SMA7036M Application Notes sOutline SMA7036M is a stepper motor driver IC developed to reduce the number of external parts required by the conventional SMA7029M. This IC successfully eliminates the need for some external parts without sacrificing the features of SMA7029M. The basic function pins are compatible with those of SMA7029M. Connect TTL or similar to the SYNC terminals and switch the SYNC terminal level high or low. When the motor is not running, set the TTL signal high (SYNC terminal voltage: 4 V or more) to make chopping synchronous. When the motor is running, set the TTL signal low (SYNC terminal voltage: 0.8 V or less) to make chopping asynchronous. If chopping is set to synchronous when the motor is running, the motor torque deteriorates before the coil current reaches the set value. If no abnormal noise occurs when the motor is not running, ground the SYNC terminals (TTL not necessary). sNotes on Replacing SMA7029M SMA7036M is pin-compatible with SMA7029M. When using the IC on an existing board, the following preparations are necessary: (1) Remove the resistors and capacitors attached for setting the chopping OFF time. (r3, r4, C1, and C2 in the catalog) (2) Remove the resistors and capacitors attached for preventing noise in the detection voltage VRS from causing malfunctioning and short the sections from which the resistors were removed using jumper wires. (r5, r6, C3, and C4 in the catalog) (3) Normally, keep pins 2 and 11 grounded because their functions have changed to synchronous and asynchronous switching (SYNC terminals). For details, see "Circuit for Preventing Abnormal Noise When the Motor Is Not Running (Synchronous circuit)." (Low: asynchronous, High: synchronous) SYNC_A TTL, etc. SYNC_B SMA7036M SYNC voltage : Low Chopping asynchronous SYNC voltage : High Chopping synchronous sCircuit for Preventing Abnormal Noise When the Motor Is Not Running (Synchronous Circuit) A motor may generate abnormal noise when it is not running. This phenomenon is attributable to asynchronous chopping between phases A and B. To prevent the phenomenon, SMA7036M contains a synchronous chopping circuit. Do not leave the SYNC terminals open because they are for CMOS input. 5V The built-in synchronous chopping circuit superimposes a trigger signal on the REF terminal for synchronization between the two phases. The figure below shows the internal circuit of the REF terminal. Since the VREF varies depending on the values of R1 and R2, determine these values for when the motor is not running within the range where the two phases are synchronized. SMA7036M R1 VREF R2 3 14 REF_A REF_B 40 (typ.) 40 (typ.) VREF waveform VREF 0 ONE SHOT (tw=2 S) FET B/B gate drive signal To comparator (high impedance) Sync/async switching signal ONE SHOT (tw=2 S) FET A/A gate drive signal sSynchronous circuit operating waveform VREF Phase A 0 VRS VREF Phase B 0 VRS Synchronous circuit OFF Synchronous circuit ON SMA7036M 15 2-Phase Stepper Motor Unipolar Driver IC (2-Phase Excitation) SMA7036M sDetermining the Output Current Fig. 1 shows the waveform of the output current (motor coil current). The method of determining the peak value of the output current (IO) based on this waveform is shown below. (Parameters for determining the output current IO) Vb: Reference supply voltage r1,r2: Voltage-divider resistors for the reference supply voltage RS: Current sense resistor (1) Normal rotation mode IO is determined as follows when current flows at the maximum level during motor rotation. (See Fig.2.) r2 Vb ................................................................ (1) IO * r1+r2 RS (2) Power down mode The circuit in Fig.3 (rx and Tr) is added in order to decrease the coil current. IO is then determined as follows. IOPD 1+ 1 r1(r2+rX) r2 * rX 1 1 r1 tively. Vb Rs * IOPD -1 - 1 r2 * Fig. 1 Waveform of coil current (Phase A excitation ON) IO Phase A 0 Phase A Fig. 2 Normal mode Vb(5V) r1 3,(13) r2 7,(9) RS Vb ......................................................... (2) RS Equation (2) can be modified to obtain equation to determine rx. rX= Fig. 3 Power down mode Vb(5V) r1 3,(13) rx Power down signal Tr RS r2 7,(9) Fig. 4 and 5 show the graphs of equations (1) and (2) respec- Fig. 4 Output current IO vs. Current sense resistor RS Fig. 5 Output current IOPD vs. Variable current sense resistor rx 4 2.0 2 r2 * Vb IO= r1+r2 RS r1=510 r2=100 rx= Vb=5V Output current IOPD (A) Output current IO (A) 3 1.5 RS =0.5 1 * Vb r1(r2+rX) RS 1+ r2 * rX r1=510 r2=100 Vb=5V IOPD= 1.0 RS =0.8 RS =1 1 0.5 0 0 1 2 3 4 00 200 400 600 800 1000 1200 Current sense resistor RS () Variable current sense resistor rX () 16 SMA7036M 2-Phase Stepper Motor Unipolar Driver IC (2-Phase Excitation) SMA7036M sThermal Design An outline of the method for calculating heat dissipation is shown below. (1) Obtain the value of PH that corresponds to the motor coil current IO from Fig. 6 "Heat dissipation per phase PH vs. Output current IO." (2) The power dissipation Pdiss is obtained using the following formula. 2-phase excitation: Pdiss 2PH+0.015xVS (W) 3 PH+0.015xVS (W) 2 (3) Obtain the temperature rise that corresponds to the calcu1-2 phase excitation: Pdiss lated value of Pdiss from Fig. 7 "Temperature rise." Fig. 6 Heat dissipation per phase PH vs. Output current IO Fig. 7 Temperature rise 1.2 Heat dissipation per phase PH (W) 150 1.0 0.8 0.6 0.4 0.2 0 0 =44 V 24V V 15 T Tj-a (C) TC-a j 36 V 100 VCC Motor : 23LM-C004 Holding mode T C Natural cooling Without heatsink 50 0 0.2 0.4 0.6 0.8 Output current IO (A) 1.0 0 1 2 3 Total Power (W) 4 Thermal characteristics 30 Case temperature rise TC-a (C) 25 20 Without heatsink Natural cooling TC ( 4 pin) 15 10 5 0 Motor : PH265-01B Motor current IO=0.8A Ta=25C VCC=24V, VS=24V 2-phase excitation 200 500 1K Response frequency (pps) SMA7036M 17 2-Phase Stepper Motor Unipolar Driver IC (2-Phase Excitation) SMA7036M sSupply Voltage VCC vs. Supply Current ICC sTorque Characteristics 500 2.0 Supply current ICC (mA) Pull-out torque (kg-cm) 400 1.5 300 Motor : 23LM-C004 1-phase excitation Holding mode IO : Output current IO=1A 1.0 200 Motor : 23LM-C202 Output current IO =0.8A Motor supply voltage VCC =24V 2-phase excitation 100 0.5 0 0.5A 0.2A 0 10 20 30 40 50 0 100 500 1K 5K Supply voltage VCC (V) Response frequency (pps) sChopper frequency vs. Supply voltage sChopper frequency vs. Output current 50 50 40 40 f (kHz) 20 Motor : 23LM-C202 IO = 0.8A at VCC=24V RS=1 f (kHz) 30 30 20 Motor : 23LM-C202 VCC=24V RS=1 10 10 0 0 10 20 30 40 50 0 0 0.2 0.4 0.6 0.8 1.0 VCC (V) IO (A) sHandling Precautions The input terminals of this product use C-MOS circuits. Observe the following precautions. q Carefully control the humidity of the room to prevent the buildup of static electricity. Since static electricity is particularly a problem during the winter, be sure to take sufficient precautions. q Take care to make sure that static electricity is not applied to the IC during wiring and assembly. Take precautions such as shorting the terminals of the printed wiring board to ensure that they are at the same electrical potential. 18 SMA7036M |
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