AL1663/AL1663R

Document number: DS38466 Rev. 2 - 2

3 of 15

www.diodes.com

March 2017

© Diodes Incorporated

AL1663/AL1663R

Pin Descriptions

Pin Number

Pin Name

Function

AL1663

AL1663R

1

8

APWM

Analog dimming input pin or PWM signal input pin in PWM dimming mode

2

—

PWMD

PWMD signal input pin in PWM-to-DC dimming mode

—

1

NC

Not Connected

3

7

COMP

Loop compensation pin

4

3

CS

Current sense pin, connect this pin to the source of the primary switch

5

4

GND

Ground

6

5

OUT

Gate driver output

7

6

VCC

Supply voltage of gate driver and control circuits of the IC

8

2

FB

The feedback voltage sensing from the auxiliary winding

Functional Block Diagram

Valley

Detector

Logical

Control

UVLO

&Bias

Driver

-

+

COMP

FB

OVP

CS

VCC

OUT

Gm

OTP

GND

DIM

Control

PWMD

APWM

Buffer

-

+

1.2V

OCP

TFP

Temperature

Detector

TFP

OTP

1(8)

2

3(7)

4(3)

5(4)

8(2)

7(6)

6(5)

A(B)

A for AL1663

B for AL1663R