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Optoelectronics/Displays  

Switching LED driver design

Posted: 08 Oct 2008     Print Version  Bookmark and Share

Keywords:LED driver  digital devices 

Using a switching regulator as an LED driver requires the designer to convert a voltage regulator into a current regulator. Beyond the challenge of changing the feedback system to control current, the LEDs themselves present a load characteristic that is much different than the digital devices and other loads that require constant voltage. The National Semiconductor LED WEBENCH online design environment predicts and simulates the response of an LED to constant current while taking into account several potential design parameters that are new to designers of traditional switching regulators.

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