AP1684

Document number: DS36547 Rev. 3 - 2

2 of 13

www.diodes.com

February 2014

© Diodes Incorporated

AP1684

A Product Line of

Diodes Incorporated

Pin Descriptions

Pin Number

Pin Name

Function

1

NC

No connection

2

RI

The initial Tonp tuning resistor

3

RM

Set the operating mode

4

CS

Primary current sensing

5

FB

The feedback voltage sensing from the auxiliary winding

6

GND

Ground

7

OUT

Gate driver output

8

VCC

Supply voltage of gate driver and control circuits of the IC

Functional Block Diagram

Regulator &

Bias

Tons

Detector

Tons

Power_EN

Driver

FB

VCC

OUT

PFM

R

S

Q

Vref

CC_CTRL

TONP_CTRL

CS

GND

Vdd

Protection

& Latch

PRO

CS_OCP

FB_CV

FB_OVP

VCC_OVP

Logic

Set Initial Tonp

& Set the IC

Working in BCM

RM

RI

Constant Turn-on Time

Generation

5

2

3

4

6

7

8