AP3107Z

Document number: DS36677 Rev. 3 - 3

2 of 11

www.diodes.com

March 2015

© Diodes Incorporated

AP3107Z

A Product Line of

Diodes Incorporated

NOT RECOMMENDED FOR NEW DESIGN

USE AP3125 Series

Typical Applications Circuit

Pin Descriptions

Pin Number

Pin Name

Function

1

BNO

Brownout Protection Pin. Connected to GND by a resistor to set the brownout level. This pin is

shortened to the ground to set the maximum brownout voltage

2

FB

Voltage Feedback Pin., Connecting it with an opto-coupler to close the control loop can

achieve system regulation

3

SENSE

Current Sense Pin. Connect it to sense the MOSFET current

4

GND

Ground

5

GATE

Gate drive output to drive the external MOSFET

6

VCC

Supply Voltage Pin

7

HV

Connect this pin to the positive terminal of bulk capacitor to provide start-up current for the

controller. When VCC voltage reaches UVLO (on), this HV loop will be turned off to save the

power loss of the start-up circuit

R10

5.1k

C10 0.1

F

C4

R9

4.7k

R8

20k

C3

2nF

R4

R12

620

R7

0.5

Q1

7N60

BD1

R2

100k

VOUT

J1

C2

100

F

1

2

4

3

U2

U3 AZ431

D2

FR107

R5

510

R1

20k

C9

470

F

L2 5

H

D3

C8

1000

F

T

HV

BNO

GATE

VCC

FB

GND

U1 AP3107Z

22

F

C1

D1

C7

C6

C5

SENSE

2k

R11

0.1

F

470pF

R3

R6

MBR20H100C

L1

J2

C11

D4

R13