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Optoelectronics/Displays??

LED backlighting solution with LM3430 and LM3432

Posted: 06 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:LED backlighting? CCRL? voltage regulator?

Since the release of high brightness White LED (HB-WLED) in the middle of 1990's, tremendous research efforts have been undergoing to improve the emission efficiency, reliability and thermal packaging technologies in order to expand its range of applications. In the last few years, improvements in HB-WLED performance and price structure attracts more potential applications considering this new lighting source technology as an alternative to conventional one. One area of applications, LCD backlighting, consider this new backlighting method as the ultimate solution to replace the existing cold cathode fluorescent lamps.

Backlight LED-driver solutions need to exhibit following characteristics:

  • Instead of voltage control, LED-driver need direct LED current control to ensure consistent color and brightness;

  • High conversion efficiency under various conditions;

  • Support PWM dimming;

  • Limit LED's rail voltage while LEDs open circuited;

  • Ability to shutdown individual channel(s) when short or open circuited LED(s) detected;

  • Device over temperature detect and shutdown;

  • Low profile, small size and ease to use.

    The LM3432 is a 6-channel high voltage current regulator which provides a simple solution for LED backlighting applications and the LM3430 is a companion device to supply high voltage required to drive serially connected LED strings. The LM3430 and the LM3432 provide a complete solution to most HB-WLED backlighting applications for notebook and PC monitor. In this application note, a typical example for a solution to drive six strings of twelve LEDs in series running at 20mA per string is described in details.

    View the PDF document for more information.




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