AL3022

Document number: DS36514 Rev. 3 - 2

1 of 12

www.diodes.com

September 2014

© Diodes Incorporated

AL3022

3043

A Product Line of

Diodes Incorporated

PWM BOOST CONTROLLER

Description

The AL3022 is

a constant

140KHz,

voltage mode,

external

compensation boost controller. The AL3022 has low feedback voltage

and makes it ideal for low cost LED backlight supplies. The AL3022

can support external PWM dimming and analog dimming.

The AL3022 offers complete system protection with integrated Under

Voltage Lockout, Over Voltage Protection, Over Current Protection,

Output

Voltage

Temperature Protection circuitry.

To satisfy the limited PCB mounting space requirements, this IC is

available in SO-8 package to save space.

Features



Voltage Mode PWM Controller



Low 0.2V Reference Voltage



Fixed 140KHz Frequency



External PWM Dimming and Analog Dimming



Low Shutdown Current (0.1µA)



External Compensation



Built-in UVLO Function



Built-in OVP



Built-in OTP



Built-in OCP





Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



Halogen and Antimony Free. “Green” Device (Note 3)

Pin Assignments

(Top View)

SO-8

Applications



LED TV



LED Monitor



LED Display Module

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html

for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

Typical Applications Circuit

C5

100pF

U1

EN

8

VIN

1

COMP

6

CS

4

GND

3

OUT

2

FB

5

OVP 7

C6

220nF

R2

20K

Ω

R7

1.1

Ω

C1

22µF/25V

R1

10K

Ω

R5

150k

Ω

R4

10K

Ω

R6

5.1K

Ω

D1

L1

22µH/2A

R3

2.2

Ω

Q1

1

EN

C4

1µF

R8

1.2

Ω

C2

10µF/

50V

C3

10µF/

50V

1

2

3

4

8

7

6

5

VIN

OUT

GND

CS

EN

OVP

COMP

FB