AP3127/H

Document number: DS37920 Rev. 2 - 2

2 of 13

www.diodes.com

September 2015

© Diodes Incorporated

AP3127/H

Typical Applications Circuit

AC

R 5

R4/1

R 25

R24

CE3

C 1

C2

T 1

U 2

U 3

D 7

GND

C11

R19

R18

21

R20

F1

C4

C Y2

AP4320

GND

GATE

FB

SENSE

VCC

AP 3127/H

U 1

Q1

NTC1

R10

D5

SOVP/

UVP

CE5

D1~D4

D+

D-

GND

AP4370

V1

VCC

V2

C10

D-

D+

GND

USB Port

R23

U 4

CE1

L1

5

6

4

2

1

4

2

6

5

1

3

R17

C 7

4

3

2

5

1

6

3

L2

R

R22

C6

MOV

Xcap

R1

R2

CE2

R4/2

R4/3

R11

R12

R6

R3

CE7

R26

CCM

GND

DRISR

AR345

VDET

AREF

U 6

1

2

3

5

6

VCC 4

R16

R14

R15

R13

CY1

Q2

D6

D8

CE4

C5

R7

R8

R27

R17

C8

C9

R9

D8

Pin Descriptions

Pin Number

Pin Name

Function

1

GND

Signal ground. Current return for driver and control circuits

2

FB

Feedback. Directly connected to the opto-coupler

3

SOVP/UVP

Sense pin for secondary side OVP and UVP

4

SENSE

Current Sense

5

VCC

Supply voltage of driver and control circuits

6

GATE

Gate driver output