AL3022

Document number: DS36514 Rev. 3 - 2

2 of 12

www.diodes.com

September 2014

© Diodes Incorporated

AL3022

3043

A Product Line of

Diodes Incorporated

Pin Descriptions

Pin Number

Pin Name

Function

1

VIN

Supply input pin. A capacitor should be connected between the VIN pin and GND pin to keep the DC

input voltage constant.

2

OUT

Gate driver pin. This pin is connected to external MOSFET gate to turn it on/off.

3

GND

Ground pin

4

CS

Over current protection pin

5

FB

Feedback pin. This pin is connected to an external resistor divider to program the system output voltage.

6

COMP

Compensation pin. This pin is the output of the internal error amplifier. COMP is forced to low when

7

OVP

Overvoltage detection pin

8

EN

Enable and dimming pin. When EN input voltage is lower than 0.3V, disable the IC. When EN input

voltage is higher than 2.6V, enable the IC. PWM dimming can be provided by an external control signal

greater than 100Hz, duty cycle from 1% to 90%. In addition, analog dimming can be provided by a DC

signal ranged from 0.8 V to 2.4V.

Functional Block Diagram

EA

Oscillator

OVP & UVP

EN

FB

GND

OVP

Control

Logic

Over

Temperature

Protection

VIN

Bandgap

VCC

Regulator

1.25V

VCC

COMP

COMP

PULSE

OUT

Driver

1

8

6

5

7

4

3

2

OCP

CS