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Power/Alternative Energy  

CCFL backlight half-bridge topology

Posted: 20 May 2009     Print Version  Bookmark and Share

Keywords:L6574  Cold cathode fluorescent lamps  CCFL 

Cold cathode fluorescent lamps (CCFL) are widely used in the backlighting of TV and PC monitor applications due to their low cost and high efficiency. A 12V or 24V DC voltage is provided for the backlighting inverter to drive the CCFL. To improve the efficiency and performance of the total system both for the AC/DC power supply and inverter, STMicroelectronics has introduced a high-voltage ballast-driver IC L6574 that provides the half-bridge solution for CCFL backlighting. Thanks to BCD offline technology, the L6574 can handle high-side voltage rail up to 600V and consumes less current. Of course, the power loss of the bridge rectifier is reduced.

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