LOW POWER PWM SWITCH FOR OFF-LINE SMPS

AP3902

Data Sheet

2

BCD Semiconductor Manufacturing Limited

Sep. 2008 Rev. 1.0

Pin Configuration

Figure 2. Pin Configuration of AP3902 (Top View)

P Package

(

VA

VCC

VS

B

GND

NC

C

C

8

7

6

5

1

2

3

4

Pin Description

Pin Number

Pin Name

Function

1VA

This pin is used for short circuit protection, and it will be pulled to low level when

short circuit happens at the load terminal

2,

VS

It is used for line voltage compensation, and PWM uses this pin to terminate the out-

put switch conduction

3

VCC

The power supply of the IC and it is also used for the feedback control

4

B

It is internally connected with the base terminal of internal NPN transistor

5, 6

C

It is internally connected with the collector terminal of internal NPN transistor

7

NC

No connection to IC

8

GND

Supply ground

DIP-8)