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AL3353 Datasheet

HIGH PERFORMANCE BOOST LED CONTROLLER

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AL3353
HIGH PERFORMANCE BOOST LED CONTROLLER
Description
The AL3353 is a highly-integrated and cost-effective Light Emitting
Diode (LED) controller optimized for LCD monitor and LCD TV
backlighting application. It provides a high-performance LED backlight
solution with low-BOM cost.
The AL3353 contains a PWM boost driver, which uses current mode
control and fixed frequency operation to regulate the LED current.
The LED current is sensed through an external current sense resistor.
The voltage across the sensing resistor is compared with reference
level of 400mV; the error is amplified to control the pulse width of the
power switch thus to regulate the current flowing the LED.
Pin Assignments
(Top View)
VIN 1
GATE 2
GND 3
CS 4
8 PWM
7 OVP
6 COMP
5 FB
The AL3353 offers PWM-to-analog dimming mode for a wide range of
dimming control.
SO-8 (Type TH2)
The AL3353 has comprehensive protection features such as power
MOSFET overcurrent protection (OCP), output overvoltage protection
(OVP), Diode & Inductor short protection, LED cathode short-to-GND
protection, IC power supply undervoltage lockout (UVLO), LED open
protection, VOUT short protection and overtemperature protection
(OTP).
The AL3353 is available in the SO-8 (Type TH2) package.
Features
Wide Input Voltage Range: 9V to 40V
High Precision Feedback Reference Voltage: 400mV/±1.5%
Current Mode PWM Controller with Good Dynamic Response
PWM to Analog Dimming Mode
Built-In Comprehensive Protections
Under Voltage Lock Out (UVLO)
Output Over Voltage Protection (OVP)
Power MOSFET Over Current Protection (OCP)
Diode and Inductor Short Protection
LED Cathode Short to GND Protection
LED Open Protection
VOUT Short Protection
Over Temperature Protection (OTP)
Available in Pb-Free SO-8 (Type TH2) Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
LCD TV
LCD Monitor
Flat Panel Display
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ 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.
AL3353
Document number: DS41487 Rev. 2 - 2
1 of 15
www.diodes.com
February 2019
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AL3353 Datasheet

HIGH PERFORMANCE BOOST LED CONTROLLER

No Preview Available !

Typical Applications Circuit
VIN
EN
PWM
GND
F1
D1
R1
C1
L1
VIN PWM
GATE OVP
GND
CMP
CS FB
C2
R2
D2
C3
R4
Q1
R3
R5
R6
Figure 1. Typical Application Schematic
Pin Descriptions
Pin Number
1
2
3
4
5
6
7
8
Pin Name
VIN
GATE
GND
CS
FB
COMP
OVP
PWM
Function
Power Supply Input
Gate Drive Output
Ground
Current Sense Input
LED Current Feedback
Boost Converter Loop Compensation
Overvoltage Protection Sense
PWM Signal Input for Analog Dimming Control
AL3353
AL3353
Document number: DS41487 Rev. 2 - 2
2 of 15
www.diodes.com
February 2019
© Diodes Incorporated


Part Number AL3353
Description HIGH PERFORMANCE BOOST LED CONTROLLER
Maker Diodes
Total Page 15 Pages
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