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AP1580
PWM CONTROL 3A STEP-DOWN CONVERTER
Features
* * * * * * * * * * * Input Voltage: 10V to 40V Adjustable Output Voltage from 0.8V to 0.9Vcc Duty Ratio: 0% to 90% PWM control Oscillation Frequency: 300KHz typical Short Circuit Protect Frequency: 30 KHz 2uA Maximum Standby Current Current Limit, Enable Function Thermal Shutdown Function Built-in Internal SW N-channel MOS Lead Free Finish/RoHS Compliant for Lead Free products (Note 1) Lead-Free Package: SOP-8L
General Description
AP1580 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier and internal NMOS. AP1580 provides low-ripple power, high efficiency and excellent transient characteristics. The PWM control circuit is able to vary the duty ratio linearly from 0 up to 90%. An enable function, an over current protect function and a short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced from 300 KHz to 30 KHz. Also, an internal compensation block is built to minimize external component count. With built-in power NMOS, a step-down switching regulator is easy to be built by adding a coil, capacitors and a diode. The high efficiency (>90%), low standby current, high input voltage (40V) and output current (3A) combining with small SOP-8L package give AP1580 unprecedented advantage in high power system applications.
Applications
* * * * Microprocessor Core Supply Networking Power Supply LCD MNT, TV Power Supply Telecom Power Supply
Ordering Information
AP 1580 X X X Packing S: SOP- 8L L : Lead Free - U : Tube -13 : Taping
Note: 1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Package
Lead - Free
Device
Lead-free
Package Code
S
Packaging (Note 2)
SOP-8L
Tube Part Number Quantity Suffix
100 -U
13" Tape and Reel Part Number Quantity Suffix
2500/Tape & Reel -13
AP1580S
Note: 2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf.
AP1580 Rev. 1
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AP1580
PWM CONTROL 3A STEP-DOWN CONVERTER
Pin Assignments
Pin Descriptions
(Top View ) EN FB Vboost Output 1 2 3 4 8 7 6 5 GND GND Vcc Vcc
Pin Name EN FB Vboost Output Vcc GND
Pin # 1
Description
AP1580
SOP-8L
H: Normal operation L: Step-down operation stopped 2 Feedback pin 3 High-side gate driver boost pin 4 Switch output pin 56 Signal Vcc 78 GND pin
Block Diagram
Output Vcc Oscillation Circuit
Reference Voltage
Driver VL
PWM - Switched Control Circuit
+ FB
Thermal Shutdown
VEN EN GND
Vboost
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AP1580
PWM CONTROL 3A STEP-DOWN CONVERTER
Absolute Maximum Ratings
Symbol VCC VFB VEN Vboost VOUTPUT Top TST
Caution:
Parameter VCC Pin Voltage VOUT Pin Voltage EN Pin Voltage Vboost Pin Voltage Switch Pin Voltage Operating Junction Temperature Range Storage Temperature Range
Rating VSS - 0.3 to VSS + 45 VSS - 0.3 to VCC VSS - 0.3 to VCC + 0.3 VOUTPUT + 5V VSS - 0.3 to VCC + 0.3 -25 to +125 -40 to +150
Unit V V V V V o C o C
The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be exceeded under any conditions.
Recommended Operating Conditions
Symbol VIN IOUT TA Parameter Input Voltage Output Current Operating Ambient Temperature Min 10 0 -25 Max 40 3 85 Unit V A o C
Electrical Characteristics (VIN = 12V, TA=25C, unless otherwise specified)
Symbol VFB VIN ISTBY VOUT/VOUT VOUT/VOUT fOSC fOSC1 DC VIH VIL ISH ISL RDS(ON) ILIMIT JA JC
Note: 3.
Parameter Feedback Voltage Input Voltage Standby Current Line Regulation Load Regulation Oscillation Frequency Frequency of Current Limit or Short Circuit Protect Maximum Duty Cycle Minimum Duty Cycle EN Pin Logic Input Threshold Voltage EN Pin Input Leakage Current Internal MOSFET RDS(ON) Current Limit Efficiency Thermal Resistance Junction-to-Ambient (Note 4) Thermal Resistance Junction-to-Case (Note 4)
Conditions
VEN =0V VIN = 10V~40V IOUT = 0.1 to 3A Measure waveform at SW pin Measure waveform at SW pin VFB =0.5V VFB =1.0V Regulator ON Regulator OFF
Min. 0.780 10 240 2.0 -4 -
Typ. 0.8 1.0 0.8 300 30 90 0 20 -10 80 4.5 90 149 13.4
Max. 0.820 40 2 1.5 1 360 0.8 120 -
Unit V V A % % KHz KHz % % V A A m A %
o
VIN = 12V, VOUT = 5V, IOUT = 3A
C/W C/W
o
The PCB layout copper area should be much greater than 10*10mm at the Vcc pins (5&6) of the AP1580, if you need large PD or low Tc&TA. The dual Vcc pins (5&6) on the SOP-8L package are internally connected. 4. Devices mounted on 2oz copper, minimum recommended pad layout, FR-4 PCB.
AP1580 Rev. 1
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AP1580
PWM CONTROL 3A STEP-DOWN CONVERTER
Typical Application Circuit
Cboost 0.1uF L1 33uH CC 1nF RA 680 ohm
Vboost VIN CIN 220uF REN 100K Vcc
Output
VOUT =5V
AP1580
FB EN GN D
+ -
COUT 470uF
CEN 0.1uF
D1 PDS 540
RB 130 ohm
Note: V OUT = VFB x (1+R A/RB) R B = 100 ~ 300 ohm
AP1580 Rev. 1
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AP1580
PWM CONTROL 3A STEP-DOWN CONVERTER
Typical Performance Characteristics
Line Regulation
2.00 1.60 Line Regulation (%) 0.80 0.40 0.00 -0.40 9 -0.80 -1.20 -1.60 -2.00 VIN (V) 12 15 18 21 24 27 30 33 36 39 Load Regulation (%) 1.20
1.50 1.20 0.90 0.60 0.30 0.00 0 0.5 1 1.5 2 2.5 3
Load Regulation
-0.30 -0.60 -0.90 -1.20
-1.50
Iout(A)
Frequency vs. Vin
350 340 330 320 310 300 290 280 270 260 250 9 12 15 18 21 24 27 30 33 36 39 VIN (V)
8 7 6 Quiescent Current (mA) 5 4 3 2 1 0 9 12 15
Iccq vs. Vin
Frequency (KHz)
18 21 24 27 VIN (V)
30 33
36 39
Efficiency
100 90 80 70 Efficiency (%) 60 50 40 30 20 10 0 0 1 Iout (A) 2 3 Vout=5V VIN=12V VIN=24V
AP1580 Rev. 1
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AP1580
PWM CONTROL 3A STEP-DOWN CONVERTER
Typical Performance Characteristics (Continued)
Vout Ripple (Vcc=24V; Vout=3.3V, Iout=0.5A, Vripple=19.0mV) Vout Ripple (Vcc=24V; Vout=3.3V, Iout= 3A, Vripple=35.0mV)
Vripple
Vripple
Phase
Phase Isw
Isw
Power Transient Wave (Iout=0~3 A, Vin=24V, Vout =3.3V)
Power Transient Wave (Iout=0.1~3 A, Vin =12V, Vout =3.3V)
Vout (AC)
Vout (AC)
Phase Iout
Phase Iout
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AP1580
PWM CONTROL 3A STEP-DOWN CONVERTER
Test Circuit
OUTPUT Vcc FB
Oscillation
open open
A + -
OUTPUT Vcc
Vboost FB
A
EN
Vboost GND
open
EN
GND
Enable function test
33uH 0.1uF
Feedback function test
Vboost OUTPUT FB Vcc
+ -
680 ohm
+ V
220uF
EN
GND
470uF -
130 ohm
Operation function test
Function Description
PWM Control The AP1580 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. The PWM controller is internally clocked by a fixed 300KHz oscillator. In converters of the AP1580, the pulse width varies in a range from 0 to 90%, according to the load current. The ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant. Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current. Enable Control This input provides an electrical ON/OFF control of the power supply. Connecting this pin to ground or to any voltage less than 0.8V will completely turn OFF the regulator. The current drain from the input supply when OFF is only 2uA. C BOOST A capacitor must be connected from pin 3 to the switch output, pin 4. This capacitor boosts the gate drive to the internal MOSFET above Vin to fully turn it ON. This minimizes conduction losses in the power switch to maintain high efficiency. The recommended value for C Boost is 0.1uF. FEEDBACK This is the input to a two-stage high gain amplifier, which drivers the PWM controller. It is necessary to connect pin 2 to the actual output of the power supply to set the DC output voltage. Two external resistors are required to set the DC output voltage. For stable operation of the power supply, it is important to prevent coupling of any inductor flux to the feedback input. Current Limit The current limit threshold is set by the internal circuit that minimum switching current is 4A. The output voltage will be reduced immediately and switching frequency will be dropped to 30KHz when switching current over limit threshold. Thermal shutdown The thermal shutdown temperature depends on internal junction temperature. When junction temperature rises up to 140, the device will be shut down and it will be recovered after temperature reduced lower than 90.
AP1580 Rev. 1
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AP1580
PWM CONTROL 3A STEP-DOWN CONVERTER
Marking Information
( Top View )
8
Logo Part No.
5
AP1580 YY WW X
Internal code Xth week: 01~52 Year: "01" =2001 "02" =2002
1
4
~
Package Information ( unit: mm )
Package Type: SOP-8L
3.70/4.10
5.79/6.20
0.08/0.25
0.254 0.38/1.27 Detail "A" 0.35max. 45
Gauge Plane Seating Plane
7~9
7~9
1.30/1.50
1.75max.
0.20typ
Detail "A"
1.27typ 4.80/5.30
0.3/0.5
3.70/4.10
AP1580 Rev. 1
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AP1580
PWM CONTROL 3A STEP-DOWN CONVERTER
IMPORTANT NOTICE Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on our website, harmless against all damages. LIFE SUPPORT Diodes Incorporated products are not authorized for use as critical components in life support devices or systems without the expressed written approval of the President of Diodes Incorporated.
AP1580 Rev. 1
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