AL1771/1772

Document number: DS41314 Rev. 1 - 2

5 of 24

www.diodes.com

August 2018

© Diodes Incorporated

AL1771/1772

Pin Descriptions

Pin Number

Pin Name

Function

AL1771

AL1772

1

TP

REF2

pin for AL1771, not to input any voltage to TP pin.

2

REF1

REF1

3

DVCC

DVCC

Power Supply for LED Driver Section

4

NC

PWM2

PWM Signal Input for Channel-2, Internally Pulled Down for AL1772; Not Connected for

AL1771.

5

PWM1

PWM1

PWM Signal Input for Channel-1, Internally Pulled Down.

6

DGND

DGND

Ground for LED Driver Section

7

NC

LED2

Channel-2 LED Cathode for AL1772; Not Connected for AL1771.

8

LED1

LED1

Channel-1 LED Cathode

9

CS

CS

Current Sense for PFC Controller

10

AGND

AGND

Ground Pin for PFC Controller

11

GD

GD

Gate Drive for PFC Controller

12

AVCC

AVCC

Power Supply for PFC Controller

13

COMP

COMP

PFC Loop Compensation

14

FB

FB

PFC output voltage feedback and inductor current zero-crossing detection pin.

15

LEDPG

LEDPG

Adaptive thermal management adjusting current output. Tied to FB to adjust PFC output

voltage.

16

FAULTB

FAULTB

Fault Report. Asserted Low to report faulty conditions. Needs an external pull-up

resistor.

Exposed PAD

EP

EP

Exposed pad.

It should be externally connected to Ground and thermal mass for enhanced thermal

impedance.

It should not be used as electrical conduction path.