AP1520

PWM CONTROL 2A STEP-DOWN CONVERTER

AP1520 Rev. 5

1 of 9

JULY 2009

DS31174

www.diodes.com

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Input Voltage: 3.6V to 23V

•

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Duty Ratio: 0% to 100% PWM Control

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Oscillation Frequency: 300kHz typ.

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Current Limit, Enable Function

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Thermal Shutdown Function

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Built-in Internal SW P-Channel MOS

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SOP-8L Pb-Free Package

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SOP-8L: Available in “Green” Molding Compound

(No Br, Sb)

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Lead Free Finish/ RoHS Compliant (Note 1)

AP1520 consists of step-down switching regulator with PWM

control. These devices include a reference voltage source,

oscillation circuit, error amplifier and internal PMOS.

AP1520 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. An enable function, an over

current protection and a short circuit protection 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 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.

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PC Motherboard

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LCD Monitor

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Graphic Card

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DVD-Video Player

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Telecom Equipment

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ADSL Modem

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Printer and other Peripheral Equipment

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Microprocessor Core Supply

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Networking Power Supply

Typical Application Circuit

AP1520

+

-

EN

D1

FB

Output

CVcc

OCSET

Optional

Option

100K

L1

22uH

6.8K

1.3K

3K

0.1uF

+

-

C

0.1uF

470uF

680uF

0.1uF

Features

General Description

Applications