HIGH PERFORMANCE BOOST LED CONTROLLER Description Pin Assignments NEW PRODUCT 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. (Top View) 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. VIN 1 8 PWM GATE 2 7 OVP GND 3 6 COMP CS 4 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
The AL3353 is available in the SO-8 (Type TH2) package. Features Applications •
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