AP3108LS

Document number: DS42105 Rev. 3 - 2

2 of 16

www.diodes.com

February 2021

© Diodes Incorporated

AP3108LS

Typical Applications Circuit

Pin Descriptions

Pin Number

Pin Name

Function

1

CTRL

Programmable external protection

2

FB

Feedback. Directly connected to the opto-coupler

3

DEM

Sample VOUT to realize SOVP and SUVP protection

4

VCC_IN

Wide range input supply voltage to produce VCC

5

GND

Signal ground

6

GATE

Gate driver output

7

VCC

Supply voltage of driver and control circuits

8

SENSE

Sense the primary current

9

HV

High voltage input. Sense line voltage and provide startup current to VCC

AC

R2

R10

R11

R15

C5

C9

C7

T 1

U2

D5

R20

F1

R13

C3

C8

CY1

GND

GATE

FB

SENSE

VCC-IN

AP3108LS

U1

Q1

NTC1

R1

D7

R12

R8

R9

DEM

C10

D 1

D4

Vo

GND

USB1

C2

L1

R21

C13

9

6

8

2

5

R14

R3

3

R16

D6

C1

D 2

D 3

C6

U3

Ictrl

Vsense

Vctrl

VCC

Vout

GND

C18

R19

R18

AP4320

C15

4

5

1

3

6

2

C17

C14

HV

VCC

CTRL

RT

1

4

7

CX

D8

D9

R4

C4

R5

R6

R7

R17

C16

R28

C11

D10

L2