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AP1511
PWM Control 5A Step-Down Converter 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 - SOP-16L Pb-Free Package.
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 very 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 -LCD MNT, TV power supply -Telecom power supply
Pin Assignments
(Top View) GND GND FB EN OCSET Vcc Output Output
1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9
Pin Descriptions
Pin Description No. 1 GND pin 2 GND pin 3 Feedback pin H: Normal operation EN 4 L: Step-down operation stopped Add an external resistor to set max OCSET 5 output current. Vcc 6 Signal Vcc Output 7 Switch output pin Output 8 Switch output pin Output 9 Switch output pin Output 10 Switch output pin PVcc 11 Power Vcc VC 12 Voltage clamp pin Vref 13 Reference voltage (Comp) 14 Option for comp GND 15 GND pin GND 16 GND pin Pin Name GND GND FB
GND GND (Comp) Vref VC PVcc Output Output
AP1511
SOP-16L
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
Rev. 1.1 Mar 4, 2005 1/5
AP1511
PWM Control 5A Step-Down Converter Ordering Information
AP 1511 X X Package S: SOP-16L Packing Blank : Tube A : Taping
Block Diagram
Output Vcc Oscillation Circuit Vccp Driver Thermal Shutdown VON/OFF VC EN OCSET (Comp) Vss PWM - Switched Control Circuit + FB CT Reference Voltage Source with Soft Start Vref
100uA
Absolute Maximum Ratings
Symbol VCC*1 VFB VON/OFF*1 VOUTPUT PD TOPR VCC Pin Voltage VOUT Pin Voltage ON/OFF Pin Voltage Switch Pin Voltage Power Dissipation Operating Temperature Range Parameter Rating 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 Unit V V V V mW
o o
C
TSTG Storage Temperature Range -40 to +150 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.
Anachip Corp. www.anachip.com.tw 2/5
Rev. 1.1 Mar 4, 2005
AP1511
PWM Control 5A Step-Down Converter Electrical Characteristics (VIN = 12V, Ta=25C, unless otherwise specified)
Symbol VIN VFB IFB ISW ISSS Parameter Input Voltage Feedback Voltage Feedback Bias Current Switch Current Current Consumption During Power Off Conditions --IOUT=0.1A -VON/OFF =0V VIN = 3.6V~23V IOUT = 0 to 5A Measure waveform at SW pin Measure waveform at SW pin Evaluate oscillation at SW pin Evaluate oscillation stop at SW pin ----VIN=5V, VFB=0V VIN=12V, VFB=0V VIN = 12V, VOUT = 5V IOUT = 5A Min. 3.6 0.784 5.5 240 10 2.0 75 0.3 Typ. 0.8 0.1 10 1 0.5 300 30 20 -10 90 2 70 50 90 Max. 23 0.816 0.5 2 1 360 60 0.8 105 5 100 70 Unit V V A A A % % KHz KHz V A A A ms m %
VOUT Line Regulation /VOUT VOUT Load Regulation /VOUT fOSC Oscillation Frequency Frequency of Current Limit fOSC1 or Short Circuit Protect VSH Power-Off Pin Input Voltage VSL Power-Off Pin Input Leakage ISH Current ISL IOCSET OCSET Pin Bias Current TSS Soft-Start Time RDSON Internal MOSFET Rdson EFFI Efficiency
Typical Application Circuit
VIN PVcc Vcc ROCSET COCSET CIN FB OCSET VC REN 20K EN CEN 0.1 VSS OUTPUT VOUT
CC Optional
RA
AP1511
D1
RB +
(Comp) Vref 0.1 Cref
COUT
CVcc
Note: VOUT = VREF x (1+RA/RB) RB=1K~10K ohm
Anachip Corp. www.anachip.com.tw 3/5
Rev. 1.1 Mar 4, 2005
AP1511
PWM Control 5A Step-Down Converter Test Circuit
Oscillation open PVcc OUTPUT VCC OCSET
A
FB
open
A +
PVcc OUTPUT VCC OCSET EN
FB
EN
VSS
-
VSS
PVcc OUTPUT VCC
+ -
FB
OCSET EN VSS
+ V
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.
Marking Information
( Top View )
16 9
Logo Part No.
AP1511 YY WW X
1 8
ID code: internal Xth week: 01~52 Year: "01" = 2001 "02" = 2002 ~
SOP-16L
Anachip Corp. www.anachip.com.tw 4/5
Rev. 1.1 Mar 4, 2005
AP1511
PWM Control 5A Step-Down Converter Package Information
Package Type: SOP-16L
E
H
L VIEW "A"
7o(4X)
D 0.015x45o A2 A 7o(4X)
A1
y
Symbol A A1 A2 B C D E e H L
Dimensions In Millimeters Min. Nom. Max. 1.40 1.60 1.75 0.10 0.25 1.30 1.45 1.50 0.33 0.41 0.51 0.19 0.20 0.25 9.80 9.90 10.00 3.80 3.90 4.00 1.27 5.80 6.00 6.20 0.38 0.71 1.27 0 8
Dimensions In Inches Min. Nom. Max. 0.055 0.063 0.069 0.040 0.010 0.051 0.057 0.059 0.013 0.016 0.020 0.0075 0.008 0.0098 0.386 0.390 0.394 0.150 0.154 0.157 0.050 0.228 0.236 0.244 0.015 0.028 0.050 0 8
Anachip Corp. www.anachip.com.tw 5/5
C
e
B
VIEW "A"
Rev. 1.1 Mar 4, 2005

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