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AP1539

18V 4A 300KHz BUCK CONVERTER

Diodes Incorporated. 

Pin Descriptions

AP1539

18V 4A 300KHz BUCK CONVERTER

Pin Name

FB

Pin No.

Description

1

Feedback pin

Power-off pin

EN

2

H: Normal operation (Step-down operation)

L: Step-down operation stopped (All circuits deactivated)

OCSET

VCC

Output

VSS

3

Add an external resistor to set max output current

4

IC power supply pin

5, 6

Switch Pin. Connect external inductor/diode here. Minimize trace area

at this pin to reduce EMI

7, 8 GND Pin

Block Diagram

Output

Oscillation

Circuit

Reference Voltage

Source with Soft Start

Vcc

Thermal

Shutdown

PWM-Switched

+

Control Circuit

-

FB

VEN

90uA

Vss

EN

OCSET

AP1539 Rev. 4

DS31477

3 of 13

www.diodes.com

OCTOBER 2009

© Diodes Incorporated

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