Datasheet AL3353 (Diodes)

AL3353 HIGH PERFORMANCE BOOST LED CONTROLLER Description Pin Assignments
The AL3353 is a highly-integrated and cost-effective Light Emitting

Diode (LED) controller optimized for LCD monitor and LCD TV
(Top View)
backlighting application. It provides a high-performance LED backlight

solution with low-BOM cost. VIN 1 8 PWM The AL3353 contains a PWM boost driver, which uses current mode

control and fixed frequency operation to regulate the LED current. GATE 2 7 OVP
T
The LED current is sensed through an external current sense resistor. The voltage across the sensing resistor is compared with reference GND 3 6 COMP
UC
level of 400mV; the error is amplified to control the pulse width of the power switch thus to regulate the current flowing the LED. CS 4 5 FB
OD R
The AL3353 offers PWM-to-analog dimming mode for a wide range of
SO-8 (Type TH2) P
dimming control.
W
The AL3353 has comprehensive protection features such as power
NE
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 Applications
• Wide Input Voltage Range: 9V to 40V • LCD TV • High Precision Feedback Reference Voltage: 400mV/±1.5% • LCD Monitor • Current Mode PWM Controller with Good Dynamic Response • Flat Panel Display • 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)
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 1 of 15 February 2019 Document number: DS41487 Rev. 2 - 2
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© Diodes Incorporated Document Outline Pin Assignments Description Applications Features