AP1682E

Document number: DS36648 Rev. 1 - 2

2 of 10

www.diodes.com

September 2014

© Diodes Incorporated

AP1682E

A Product Line of

Diodes Incorporated

Typical Applications Circuit

T1

1

OUT

+

VCC

FB

OUT

CS

GND

VS

VPK

R6

C5

R3

R11

R12

R16

R17

R15

D1

D2

CY1

C6

R19

D3

C7

R18

R8

R9

Q1

R10

AC

Input

F1

VR1

L2

DB1

C2

L1

R2

C1

R1

ZD2

R13

C4

R4

R5

R7

C3

R14

ZD1

R20

5

3

4

AP1682E

8

5

7

4

6

2

3

Pin Descriptions

Pin Number

Pin Name

Function

1

NC

No connection

2

VS

The rectified input voltage sensing pin. The pin is detecting the instantaneous rectified sine waveform of

input voltage

3

VPK

The rectified input voltage peak value sensing pin. The pin is detecting the rectified sine waveform peak

value of input voltage

4

CS

Primary current sensing

5

FB

This pin captures the feedback voltage from the auxiliary winding. FB voltage is used to control no load

output voltage and determine acceleration stop point at start-up phase

6

GND

Ground. Current return for gate driver and control circuits of the IC

7

OUT

Gate driver output

8

VCC

Supply voltage of gate driver and control circuits of the IC

Functional Block Diagram

Regulator

&

Bias

OVP

Tonsec

Detector

0.1V

1.8

PFM

Tons

UVLO

COMP

EA

UVLO

pro

CV_CTRL

R

Q

S

R

Q

S

CC_CTRL

FB

CS

VS

VCC

OUT

GND

Acceleration Start

Control

Peak Current Control

& LEB

Input Current

Shaping and

Constant Current

Control

VPK

2

3

4

5

6

7

8