AP1623

PWM Control Step-Down Switching Regulator-Controllers

Anachip Corp.

www.anachip.com.tw

Rev. 0.1 Feb 10, 2004

4/6

Typical Application Circuit

（

1） Normal Application

Oscillation

Circuit

Reference Voltage

Source with

Soft Start

PWM-Switched

Control Circuit

+

-

AP1623

+

-

V

SS

ON/OFF

C

C

R

A

R

B

D1

OUT

V

OUT

R

1

R

2

SW

（

2） Application with Short Circuit Protection

AP1623

+

-

V

SS

ON/OFF

C

C

R

A

R

B

D1

V

OUT

SW

1N4148 for above 5V Vin and

Schottky for below 5V Vin

0.1uF

100uF

0.33uF

1M

4.7M

47K

100uF

Test Circuit

A

VOUT

VCC

VSS

ON/OFF

open

open

VOUT

VCC

VSS

ON/OFF

+

-

SW

SW

PVCC

PVCC

A

VOUT

VCC

VSS

ON/OFF

+

-

+

-

V

SW

PVCC