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AP1534

PWM CONTROL 2A STEP-DOWN CONVERTER

AP1534

Document number: DS31314 Rev. 6 - 2

1 of 9

www.diodes.com

April 2011

Description

AP1534 consists of step-down switching regulator with PWM

control. These devices include a reference voltage source,

oscillation circuit, error amplifier, internal PMOS.

AP1534 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 99%. 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 50KHz. Also, an internal compensation block is

built in to minimize 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 SO-8 mini-packages, 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.

Pin Assignments

SO-8

(Top View)

AP1534

Output

OCSET

Features

• Input voltage: 3.6V to 18V

• Output voltage: 0.8V to V

• Duty ratio: 0% to 99% PWM control

• Oscillation frequency: 300KHz typical

• Current limit, Enable function

• Thermal Shutdown function

• Built-in internal SW P-channel MOS

• SO-8: Available in “Green” Molding Compound

(No Br, Sb)

• Lead Free Finish/RoHS Compliant (Note 1)

Applications

• PC Motherboard

• LCD Monitor

• Graphic Card

• DVD-Video Player

• Telecom Equipment

• ADSL Modem

• Printer and other Peripheral Equipment

• Microprocessor Core Supply

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.

Typical Application Circuit



AP1534

B240A

Vcc

Output

CVcc

OUT

=5V/2A

OCSET

OUT

Optional

OCSET

Option

100K

22uH

6.8K

1.3K

5.6K

0.1uF

0.1uF 470uF

470uF

0.1uF

(Note 2)

Note: V = V x (1+R /R )

R = 0.7K~5K

OUT FB A B

Notes: 2. Suggested DIODES Power Schottky P/N: B240/B340 series.

1 2 3 4 5 6 7 8 9

Résumé du contenu

Page 1 - R = 0.7K~5K

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Page 2 - AP1534

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Page 3 - Electrical Characteristics (V

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Page 4

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Page 5 - Operation function test

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Page 6 - April 2011

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Page 8 - 13 : Tape & Reel

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