AP3102/V/L

Document number: DS37419 Rev.2 - 2

2 of 14

www.diodes.com

July 2014

© Diodes Incorporated

AP3102/V/L

A Product Line of

Diodes Incorporated

Typical Applications Circuit

R11

5.1 k

C8 0.1

F

C3

47

F

R12

4.7 k

R10

20 k

C2

2nF

R7

R4 20

R3

3.9

R13

620

R6

0.55

Q1

7N60

BD1

R2

100k

12V/3A

J2

J1

C1

100

F

1

2

4

3

U2 P817

Q2

AZ431

D2

D1

FR107

R8 27k

R1

2M

C7

470

F

L2

8

H

D3

C 10

1000

F

T

C9

1nF

R9 10

ADJ

5

SENSE

6

B OK

3

RI

4

GATE

8

VCC

7

FB

2

GND

1

U1

AP3102

10 M

82k

3.3 F

C4

CX1

D4

6.8nF

10nF

R4

R5

CY

C5

C6

0.1

F

C9

18 k

1 k

R14

For AP3102

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

BOK

Brownout Protection Pin. Connected to a resistor divider from the ground to bulk capacitor

for setting the brownout level and line compensation. When the voltage of this pin is lower

than 0.5V and lasts 35ms, the PWM signal will be off and system enters the auto

recoverable protection mode (hiccup mode). Moreover, this pin is also applied for line OVP

(trigger level is 4V) and line compensation (compensate the current sense for over load

protection.)

4

RI

Set the bias current to determine the normal switching frequency

5

ADJ

To adjust the level of skip cycle. When its value is greater than 4.5V, the system will be

latched

6

SENSE

Current sense

7

VCC

Supply voltage of driver and control circuits

8

GATE

Gate driver output