Boost Controller for LED/LCD Applications Delivers 1~100% Dimming Range

Diodes Incorporated released the AL3353 LED/LCD 40V max input boost controller with a dimming ratio of 100:1 features a wide range of applications where a constant voltage or constant current are required to drive displays and backlights. The AL3353 offers a wide input voltage of 9V to 40V which allows to easily adapt to a variety of common supply voltages, such as 12V, 24V, and 36V, without further configuration or loss of efficiency. The applications of boost controller include an LED driver for commercial lighting applications and as a backlight driver for LCD TVs, flat panel displays and LCD monitors.

The AL3353 multipurpose boost controller also features comprehensive and robust circuit protection based on proprietary technology. The AL3353 maintains linearity across temperature and process variations through the implementation of Diodes’ dynamic linearity compensation technique, which uses an offset cancellation chopping circuit. This technology accepts a digital PWM input and converts to an internal analog signal to control the dimming level, which operates in 100:1 ratio or from 1% to 100% dimming range.

Along with excellent dimming capabilities and a wide input voltage range, the AL3353 also offers extensive protection designed specifically for the target applications such as diode and inductor short protection, LED-open protection, LED cathode short-to-GND protection and power MOSFET overcurrent protection. The AL3353 also comes with additional protection features such as VOUT-short protection, under-voltage lock-out, over-temperature protection and output overvoltage.