AP3968/69/70

Document number: DS36759 Rev. 2 - 2

3 of 15

www.diodes.com

December 2013

© Diodes Incorporated

AP3968/69/70

A Product Line of

Diodes Incorporated

Pin Descriptions

Pin Number

Pin Name

Function

SO-7/PDIP-7

PDIP-8

1

1

CPC

This pin connects a capacitor to GND for output cable compensation

2

2

FB

The voltage feedback from auxiliary winding

3

3

VCC

This pin receives rectified voltage from the auxiliary winding of the transformer

4

4

CS

Current sense for primary side of transformer

5, 6

5, 6

C

This pin is connected with an internal power BJT’s collector

–

7

NC

Not connected

7

8

GND

This pin is the signal reference ground

Functional Block Diagram

Regulator

&

Bias

OVP

&

OCkP

0.1V

pfm

Tons

UVLO

COMP

EA

UVLO

CV_ctrl

pfm

Driver

R

Q

S

R

Q

S

Tons

CC_ctrl

FB

CS

CPC

VCC

C

GND

Cable Drop

Compensation

Constant

Voltage

Peak

Current

Control&

LEB

Constant

Current Control

Tonsec

Detector

Line Voltage

Compensation

Audible

Noise

Suppression

Buffer

1 (1)

2 (2)

3 (3)

4 (4)

5,6 (5,6)

7 (8)

A(B)

A for SO-7/PDIP-7

B for PDIP-8