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Not Recommended for New Designs
Features
* * * * * * * * * Input voltage: 3.6V to 23V 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 Lead-Free Package: SOP-16L Lead Free Finish/RoHS Compliant (Note 1)
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
General Description
AP1511 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. AP1511 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-16L mini-package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 23V, it is also suitable for the operation via an AC adapter.
Applications
* * * * Microprocessor core supply Networking power supply Telecom power supply LCD MNT, TV power supply
Ordering Information
AP1511 X X X Package S : SOP-16L
Note:
Lead Free L : Lead Free
Packing -U : Tube -13 : Tape & Reel
1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.
Device AP1511S
Lead-free
Tube Package Packaging Part Number Code (Note 2) Quantity Suffix S SOP-16L 50 -U
13" Tape and Reel Quantity 2500/Tape & Reel Part Number Suffix -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.
AP1511 Rev. 1
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(c) Diodes Incorporated
Not Recommended for New Designs
Pin Assignments Pin Descriptions
Pin Pin Name No. GND GND FB EN OCSET Vcc Output Output Output Output PVcc VC NC NC GND GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
GND GND FB EN OCSET Vcc Output Output
1 2 3 4 5 6 7 8
.
(Top View)
16 15 14 13 12 11 10 9
Description GND pin GND pin Feedback pin H: Normal operation L: Step-down operation stopped Add an external resistor to set max output current. Signal Vcc Switch output pin Switch output pin Switch output pin Switch output pin Power Vcc Voltage clamp pin Not connected Not connected GND pin GND pin
GND GND NC NC VC PVcc Output Output
AP1511
SOP-16L
Block Diagram
Output Vcc Oscillation Circuit Vccp Driver Thermal Shutdown VEN VC EN OCSET Vss PWM - Switched Control Circuit + FB CT Reference Voltage Source with Soft Start
100 uA
AP1511 Rev. 1
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(c) Diodes Incorporated
Not Recommended for New Designs
Absolute Maximum Ratings
Symbol ESD MM VCC VFB VEN VOUTPUT PD TOP TST Parameter Machine Model ESD Protection VCC Pin Voltage VOUT Pin Voltage EN Pin Voltage Switch Pin Voltage Power Dissipation (Note 3) Operating Junction Temperature Storage Temperature Range Rating 5 350
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
Unit KV V V V V V mW
o o
ESD HBM Human Body Model ESD Protection
VSS - 0.3 to VSS + 25 VSS - 0.3 to VCC VSS - 0.3 to VCC + 0.3 VSS - 0.3 to VIN + 0.3 Internally limited -20 to +125 -40 to +150
C 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. Note: 3. Due to the IC and SBD and Inductor were hot in high current, if you need to reduce the operation temperature that you must increase the component space or thermal dissipation space.
Recommended Operating Conditions
Symbol VIN IOUT TA Parameter Input Voltage Output Current Operating Ambient Temperature Min 3.6 0 -20 Max 23 5 125 Unit V A o C
AP1511 Rev. 1
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(c) Diodes Incorporated
Not Recommended for New Designs
Electrical Characteristics
( VIN = 12V, TA = 25C, unless otherwise specified )
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
Symbol Parameter Conditions VFB Feedback Voltage -IFB Feedback Bias Current IOUT = 0.1A ISW Switch Current -Current Consumption During ISSS VEN = 0V Power Off VOUT Line Regulation VIN = 3.6V~23V /VOUT VOUT Load Regulation IOUT = 0 to 5A /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 Power-Off Pin Input Voltage VSL Evaluate oscillation stop at SW pin Power-Off Pin Input Leakage -ISH 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 Efficiency IOUT = 5A Thermal Resistance JA SOP-16 (Note 4) Junction-to-Ambient Thermal Resistance JC SOP-16 (Note 4) Junction-to-case
Note: 4. Test conditions for SOP-16L: No heat sink.
Min 0.784 5.5 240 10 2.0 75 0.3 -
Typ. 0.8 0.1 10 1 0.5 300 20 -10 90 2 70 50 90 156 11
Max 0.816 0.5 2 1 360 0.8 105 5 100 70 -
Unit V A A A % % KHz KHz V A A A ms m %
o
C/W C/W
o
AP1511 Rev. 1
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(c) Diodes Incorporated
Not Recommended for New Designs
Typical Application Circuit
L1 15uH OUTPUT CC Optional RA 6.8K
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
VIN 2.2 ROCSET 3K CIN 680uF REN 20K CEN 0.1uF COCSET C 0.1uF
PVcc Vcc
VOUT
AP1511
OCSET VC EN
FB
COUT 470uF RB 1.3K C 0.1uF
VSS
D1
CVcc 0.1uF
Note: VOUT = VREF x (1+RA/RB) RB=1K~10K ohm
VOUT L1 Value
VIN = 12V, IMAX = 5A 2.5V 3.3V 10uH 12uH
5V 15uH
Typical Performance Characteristics
Efficiency (Vin = +5V)
100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 0.0 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 0.0
Efficiency (Vin = +12V)
Efficiency (%)
Efficiency (%)
Vout:3.3V Vout:5.0V 2.0 4.0 6.0
Vout:3.3V 2.0
Iout (A)
4.0
6.0
Iout (A)
AP1511 Rev. 1
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(c) Diodes Incorporated
Not Recommended for New Designs
Test Circuit
open PVcc OUTPUT VCC
1K
A
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
Oscillation
FB
open
A
PVcc OUTPUT VCC OCSET EN
FB
OCSET EN VSS
1K
+ -
VSS
Enable function test
33K
Feedback function test
PVcc OUTPUT VCC
3K
+ -
FB
6.8K
+ V
OCSET EN VSS
1.2K
Operation function test
Function Description
PWM Control The AP1511 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the AP1511, 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.
AP1511 Rev. 1
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NOVEMBER 2007
(c) Diodes Incorporated
Not Recommended for New Designs
Marking Information
( Top View )
16 9
AP1511
PWM CONTROL 5A STEP-DOWN CONVERTER
Logo Part No.
AP1511 YY WW X X
1 8
Internal Code Blank : Lead Free Xth week : 01~52 Year : "07" = 2007 "08" = 2008 ~
SOP-16L
Package Information
(All Dimensions in mm)
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.
AP1511 Rev. 1
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(c) Diodes Incorporated

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