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Diodes Semiconductor Electronic Components Datasheet


AL3022

PWM BOOST CONTROLLER



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AL3022 pdf
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
10K
R2
20K
C6
220nF
C5
100pF
U1
1 VIN
8
EN
6 COMP
5
FB
OUT 2
GND 3
CS 4
OVP 7
R4
10K
Q1
R3 1
2.2
R5
150k
R6
5.1K
C3
10µF/
50V
VOUT
R7
1.1
R8
1.2
AL3022
Document number: DS36514 Rev. 3 - 2
1 of 12
www.diodes.com
September 2014
© Diodes Incorporated



No Preview Available !

AL3022 pdf
Pin Descriptions
Pin Number
1
2
3
4
5
Pin Name
VIN
OUT
GND
CS
FB
6 COMP
7 OVP
8 EN
A Product Line of
Diodes Incorporated
AL3022
3043
Function
Supply input pin. A capacitor should be connected between the VIN pin and GND pin to keep the DC
input voltage constant.
Gate driver pin. This pin is connected to external MOSFET gate to turn it on/off.
Ground pin
Over current protection pin
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
VIN<3.6V.
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
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
5
COMP
6
EA
COMP
EN
8 1.25V
Bandgap
VCC
VCC
Regulator
Oscillator
PULSE
1
VIN
OVP & UVP
7
OVP
Control
Logic
2
Driver
OUT
4
OCP
CS
Over
Temperature
Protection
3 GND
AL3022
Document number: DS36514 Rev. 3 - 2
2 of 12
www.diodes.com
September 2014
© Diodes Incorporated



Part Number AL3022
Description PWM BOOST CONTROLLER
Maker Diodes - Diodes
Total Page 12 Pages
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