A Product Line of
Diodes Incorporated
AL3022
3043
PWM BOOST CONTROLLER
Description Pin Assignments
The AL3022 is a constant 140KHz, voltage mode, external
compensation boost controller. The AL3022 has low feedback voltage
(Top View)
and makes it ideal for low cost LED backlight supplies. The AL3022
can support external PWM dimming and analog dimming.
VIN 1 8 EN
The AL3022 offers complete system protection with integrated Under
Voltage Lockout, Over Voltage Protection, Over Current Protection,
2 7 OVP
OUT
Output Voltage (V ) Short to GND Protection and Over
OUT
Temperature Protection circuitry.
GND 3 6 COMP
To satisfy the limited PCB mounting space requirements, this IC is
5 FB
CS 4
available in SO-8 package to save space.
Features
SO-8
Voltage Mode PWM Controller
Low 0.2V Reference Voltage
Fixed 140KHz Frequency
Applications
External PWM Dimming and Analog Dimming
Low Shutdown Current (0.1A) LED TV
External Compensation LED Monitor
Built-in UVLO Function LED Display Module
Built-in OVP
Built-in OTP
Built-in OCP
Built-in V Short to GND Protection
OUT
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. Green Device (Note 3)
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See
A Product Line of
Diodes Incorporated
AL3022
3043
Pin Descriptions
Pin Number Pin Name Function
Supply input pin. A capacitor should be connected between the VIN pin and GND pin to keep the DC
1 VIN
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.
Compensation pin. This pin is the output of the internal error amplifier. COMP is forced to low when
6 COMP
V <3.6V.
IN
7 OVP Overvoltage detection pin
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
8 EN
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
FB COMP
5 6
7
OVP
OVP & UVP
EA
2
Control
COMP
OUT
Driver
Logic
4
OCP CS
3
GND
Over
8
1.25V VCC
VCC
EN
Bandgap
Temperature
Regulator
Protection
Oscillator
PULSE
1
VIN
2 of 12
AL3022 September 2014
Diodes Incorporated
www.diodes.com
Document number: DS36514 Rev. 3 - 2
NEW PRODUCT
0 to 200mV REF
SAW