AL3022 Datasheet, PDF (1/12 Pages) Diodes Incorporated – PWM BOOST CONTROLLER

A Product Line of
Diodes Incorporated
AL3022
PWM BOOST CONT³R⁰O⁴L³LER
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 (VOUT) Short to GND Protection and Over
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
 Built-in VOUT Short to GND Protection
 Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
 Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
VIN 1
OUT 2
GND 3
CS 4
SO-8
Applications
 LED TV
 LED Monitor
 LED Display Module
8 EN
7 OVP
6 COMP
5 FB
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
VIN
L1
C1 22µH/2A
22µF/25V
D1
C2
10µF/
50V
C4
1µF
EN R1
10KΩ
R2
20KΩ
C6
220nF
C5
100pF
U1
1 _VIN
8
EN
6 _COMP
5
FB
OUT ²
GND ³
CS ⁴
OVP ⁷
R4
10KΩ
Q1
R3 ₁
2.2Ω
R6
5.1KΩ
R5
150kΩ
C3
10µF/
50V
VOUT
R7
1.1Ω
R8
1.2Ω
AL3022
Document number: DS36514 Rev. 3 - 2
1 of 12
www.diodes.com
September 2014
© Diodes Incorporated