AP1685

Document number: DS37311 Rev. 1 - 2

3 of 14

www.diodes.com

September 2014

© Diodes Incorporated

AP1685

A Product Line of

Diodes Incorporated

Pin Descriptions

Pin Number

Pin Name

Function

1

S

Internal MOSFET

’s Source

2

CS

Current sensing

3

RI

Setting the initial on time

4

GND

Ground

5

FB

The feedback voltage from auxiliary winding

6

VCC

Supply voltage of gate driver and control circuits of the IC.

7

Drain

Internal MOSFET

’s Drain

Functional Block Diagram

Tons

Power_EN

Driver

FB

VCC

Drain

PFM

R

S

Q

Vref

CC_CTRL

TONP_CTRL

CS

Vdd

PRO

CS_OCP

FB_CV

FB_OVP

VCC_OVP

Logic

Vcsmax

Vcs_valley

RI

5

3

2

1

6

S

7

4

GND

Set Initial Tonp

Tons

Detector

Constant

Turn-on Time

Generation

Protection

& Latch

Regulator

&

Bias