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AP1530
PWM CONTROL 3A STEP-DOWN CONVERTER
Features
* * * * * * * * * Input voltage: 3.6V to 18V Output voltage: 0.8V to VCC. Duty ratio: 0% to 100% PWM control Oscillation frequency: 300KHz typ. Soft-start, Current Limit, Enable function Thermal Shutdown function Built-in internal SW P-channel MOS SOP-8L Pb-Free Package Lead Free Finish/RoHS Compliant (Note 1)
General Description
AP1530 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS. AP1530 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 100%. This converter also contains an error amplifier circuit as well as a soft-start circuit that prevents overshoot at startup. 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 300KHz to 30KHz. Also, an internal compensation block is built in to minimum external component count. With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP-8L mini-package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 18V, it is also suitable for the operation via an AC adapter.
Applications
* * * * * * * * * PC Motherboard LCD Monitor Graphic Card DVD-Video Player Telecom Equipment ADSL Modem Printer and other Peripheral Equipment Microprocessor core supply Networking power supply
Ordering Information
A P 1 5 30 X X X
Package S : SOP-8L
Lead Free L : Lead Free
Packing -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.
Device
AP1530S
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
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.
AP1530 Rev. 1
1 of 8 www.diodes.com
MARCH 2007
(c) Diodes Incorporated
AP1530
PWM CONTROL 3A STEP-DOWN CONVERTER
Pin Assignments
Pin Descriptions
FB 1 EN 2 AP1530 OCSET 3 VCC 4
8 7 6 5
Vss Vss Output Output
Name FB EN
OCSET VCC Output VSS
Pin Description 1 Feedback pin. Power-off pin H: Normal operation 2 (Step-down operation) L: Step-down operation stopped (All circuits deactivated) Add an external resistor to set 3 max output current. 4 IC power supply pin Switch Pin. Connect external inductor/diode here. Minimize 56 trace area at this pin to reduce EMI. 78 GND Pin
Block Diagram
Output Oscillation Circuit Vcc PWM-Switched Control Circuit Thermal Shutdown VEN 100uA Vss
+
Reference Voltage Source with Soft Start
FB
-
EN
OCSET
AP1530 Rev. 1
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MARCH 2007
(c) Diodes Incorporated
AP1530
PWM CONTROL 3A STEP-DOWN CONVERTER
Absolute Maximum Ratings
Symbol VCC VFB VEN VOUTPUT PD TOP TSTG Parameter VCC Pin Voltage Feedback Pin Voltage EN Pin Voltage Switch Pin Voltage Power Dissipation Operating Junction Temperature Range Storage Temperature Rating VSS - 0.3 to VSS + 20 VSS - 0.3 to VCC VSS - 0.3 to VIN + 0.3 VSS - 0.3 to VIN + 0.3 Internally limited -40 to +125 -65 to +150 Unit V V V V mW o C o C
Caution: 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.
Electrical Characteristics
Symbol VIN VFB IFB ISW ISSS Parameter Input Voltage Feedback Voltage Feedback Bias Current Switch Current Current Consumption During Power Off
(VIN = 12V, TA=25C, unless otherwise specified)
Conditions -IOUT=0.1A IOUT=0.1A -VEN =0V
Min. 3.6 0.784 3.5 240 10 2.0 75 0.3 -
Typ. 0.8 0.1 10 1 0.2 300 20 -10 90 2 110 70 92 65
Max. 18 0.816 0.5 2 0.5 360 0.8 105 5 150 100 -
Unit V V A A A % % KHz KHz V A A A ms m %
o
VOUT Line Regulation VIN=5V~18V /VOUT VOUT Load Regulation IOUT=0.1 to 3A /VOUT fOSC Oscillation Frequency Measure waveform at SW pin Frequency of Current Limit or fOSC1 Measure waveform at SW pin Short Circuit Protect VSH Evaluate oscillation at SW pin EN Pin Input Voltage VSL Evaluate oscillation stop at SW pin ISH -EN Pin Input Leakage Current ISL -IOCSET OCSET Pin Bias Current -TSS Soft-Start Time -VIN=5V, VFB=0V RDSON Internal MOSFET Rdson VIN=12V, VFB=0V VIN=12V, VOUT = 5V EFFI Efficiency IOUT=3A Thermal Resistance JA Junction-to-Ambient
C/W
AP1530 Rev. 1
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MARCH 2007
(c) Diodes Incorporated
AP1530
PWM CONTROL 3A STEP-DOWN CONVERTER
Typical Application Circuit
VIN ROCSET COCSET 3K Option CIN 680uF CVcc 0.1uF REN 100K CEN 0.1uF
Vcc
Output
L1 22uH CC Optional RA 6.8K
VOUT
AP1530
OCSET EN VSS FB
+ -
C
+ -
COUT 470uF
0.1uF
D1 PDS540
RB 1.3K
Note: VOUT = VFB x (1+RA/RB) RB=0.7K~5K ohm
VIN=12V, IMAX=3A 2.5V 3.3V 15uH 18uH
VOUT L1 Value
5V 22uH
AP1530 Rev. 1
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MARCH 2007
(c) Diodes Incorporated
AP1530
PWM CONTROL 3A STEP-DOWN CONVERTER
Typical Performance Characteristics
AP1530 Vin vs. FB (Vout=3.3V; Iout=0.2A)
350 345 340 Fosc (KHz) 330 325 320 315 310 0
AP1530 Vin vs. Frequency (Vout=3.3V; Iout=0.2A)
FB (V)
335
0.84 0.83 0.82 0.81 0.80 0.79 0.78 0.77 0.76 0.75 0.74 0 2
2
4
6
8 10 12 Vin (V)
14
16
18
20
4
6
8
Vin (V)
10 12 14 16 18 20
3.40 3.35
AP1530 Line Regulation (Vout=3.3V; Iout=0.2A)
Vout (V)
3.25 3.20 3.15 3.10 0 2 4 6 8
Vout (A)
3.30
5.10 5.09 5.08 5.07 5.06 5.05 5.04 5.03 5.02 5.01 5.00 0.0
AP1530 Load Regulation (Vin=12V)
Vin (V)
10 12 14 16 18 20
1.0
2.0
3.0
4.0
Iout (A)
AP1530 Efficiency
100 90 80 70 60 50 40 30 20 10 0 0.0 1.0
Efficiency (%)
Vout:5.0V Vout:3.3V 2.0 3.0
Iout (A)
AP1530 Rev. 1
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MARCH 2007
(c) Diodes Incorporated
AP1530
PWM CONTROL 3A STEP-DOWN CONVERTER
Typical Performance Characteristics
AP1530 Vout Ripple (Vin=12V; Vout=3.3V; Iout=0.1A)
(Continued)
AP1530 Vout Ripple (Vin=12V; Vout=3.3V; Iout=3A)
Test Circuit
open VCC OUTPUT FB open
Oscillation
A
1K~3K
1K~3K
A
VCC
OUTPUT
FB
OCSET EN VSS
+ -
OCSET EN
VSS
Enable function test
Feedback function test
1K~3K
+ -
VCC
OUTPUT
FB
OCSET EN VSS
+ V
Operation function test
Note: 3. For the Rocset selection, please refer to the formula in Function Description.
AP1530 Rev. 1
6 of 8 www.diodes.com
MARCH 2007
(c) Diodes Incorporated
AP1530
PWM CONTROL 3A STEP-DOWN CONVERTER
Function Description
PWM Control The AP1530 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the AP1530, the pulse width varies in a range from 0 to 100%, 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. Under Voltage Lockout The under voltage lockout circuit of the AP1530 assures that the high-side MOSFET driver outputs remain in the off state whenever the supply voltage drops below 3.3V. Normal operation resumes once VCC rises above 3.5V. RDS(ON) Current Limiting The current limit threshold is set by the external resistor connected from VCC supply to OCSET. The internal 100uA sink current crossing the resistor sets the voltage at the pin of OCSET. When the PWM voltage is less than the voltage at OCSET, an over-current condition is triggered.
ILOAD x RDS(ON) = IOCSET x ROCSET
See above formula for setting the current limit value.
Marking Information
( Top View )
8
5
Logo
AP1530 YY WW X
Part no. Internal code Xth week: 01~52 Year: "01" =2001 "02" =2002
1
4
~
Device
AP1530S
Package
SOP-8L
Identification Code
AP1530
AP1530 Rev. 1
7 of 8 www.diodes.com
MARCH 2007
(c) Diodes Incorporated
AP1530
PWM CONTROL 3A STEP-DOWN CONVERTER
Package Information
Package Type: SOP-8L
( unit: mm )
3.70/4.10
5.79/6.20
0.08/0.25
0.254 0.38/1.27
Gauge Plane Seating Plane
Detail "A"
7~9 1.30/1.50 1.75max. 0.20typ 7~9
0.35max. 45
Detail "A"
3.70/4.10
1.27typ 4.80/5.30
0.3/0.5
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.
AP1530 Rev. 1
8 of 8 www.diodes.com
MARCH 2007
(c) Diodes Incorporated

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