AP3303

Document number:DS41016 Rev. 5 - 2

2 of 16

www.diodes.com

May 2019

© Diodes Incorporated

AP3303

Typical Applications Circuit

CY1

R 4

R8

C6

C3

C8

T1

U2

R19

C9

GND

GATE

FB

SENSE

VCC-IN

AP3303

U1

Q 1

D7

R 6

R7

DEM

C4

9

6

8

2

5

R18

3

DRISR VCC

GND

VDD

AREF

VDET

1

2

3

4

5

6

R20

C12

Q2

U3

C7

C13

HV

VCC

CTRL

RT1

1

4

7

APR347

CC1

GND

AP 43771

OCDRV

VCC

C15

U4

CC2

V5V

PWR_EN

VBUS

VFB

IFB

OTP

ISENP

RT2

C16

C18

C19

R 22

C20

R25

C11

DN

DP

Vo

GND

CON1

Q3

CC2

CC1

D-

D+

AC

R11

D5

F1

C5

NTC1

R10

BD1

C2

L2

R14

D6

C1

R15

C10

R13

R12

L1

R2

L 3

D 9

D 8

Pin Descriptions

Pin Number

Pin Name

Function

1

CTRL

Programmable External Protection

2

FB

Feedback. Directly Connected to the Opto-coupler

3

DEM

Valley Detection for QR Control. 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