AP3987CT

Document number: DS41644 Rev. 2 - 2

2 of 15

www.diodes.com

June 2019

© Diodes Incorporated

AP3987CT

Typical Applications Circuit

+

U2

APR 3415CT

R10

VCC

AREF

DRAIN

DRAIN

GND

GND

VDET

DRISR

R11

C6

R8

C7

C2

FR1

D5

T1

D

R6

D

GND

R5

R7

OTP

U1

VCC

CS

5V/1.5A

D1 to D4

R2

R1

C3

D6

CY

AP3987CT

C1

Np

Na

+

+

L1

R3

2

3

4

5

6

7

C5

Ns

R9

C8

FB

1

C4

+

L2

R4

5V/1.5A Solution with AP3987CT+APR3415CT

Pin Descriptions

Pin Number

Pin Name

Function

1

FB

The Voltage Feedback from Auxiliary Winding

2

OTP

The External Over Temperature Protection

3

VCC

Supply Voltage Pin

4

CS

Current Sense for Primary Side of Transformer

5, 6

D

This pin is connected with an internal power MOSFET

’s drain

7

GND

This pin is the signal reference ground