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AP1538

18V 3A 300KHz BUCK CONVERTER

Diodes Incorporated. 

Pin Descriptions

AP1538

18V 3A 300KHz BUCK CONVERTER

Pin Name Pin No.

Description

FB

1 Feedback pin

EN

OCSET

VCC

Output

Power-off pin

H: Normal operation

2

(Step-down operation)

L: Step-down operation stopped

(All circuits deactivated)

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

VSS

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

AP1538 Rev. 5

DS31451

3 of 13

www.diodes.com

OCTOBER 2009

© Diodes Incorporated

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