PRIMARY SIDE CONTROL IC FOR OFF-LINE BATTERY CHARGERS

AP3708N

Preliminary Datasheet

2

BCD Semiconductor Manufacturing Limited

Apr. 2009 Rev. 2. 1

1

2

3

4

8

7

6

5

Pin Configuration

Figure 2. Pin Configuration of AP3708N (Top View)

M Package

(SOIC-8)

CS

OUT

VCC

GND

BIAS

VDD

FB

CMP

Pin Description

Pin Number

Pin Name

Function

1

CS

The primary current sense

2,

VCC

Supply voltage

3

OUT

This pin drives the base of external power NPN switch

4

GND

Ground

5

CMP

This pin connects a capacitor for output cable compensation

6

FB

The voltage feedback from the auxiliary winding

7

VDD

The 5V output of the internal voltage regulator

8

BIAS

This pin sets the bias current inside AP3708N with an external resistor to GND