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Optoelectronics/Displays  

Using current source drivers to boost series-connected LED output

Posted: 20 Apr 2007     Print Version  Bookmark and Share

Keywords:series-connected LED  buckboost converter  constant-current LED driver  power-stage topology 

For optimum performance, high brightness LEDs should be driven by a current source rather than by a voltage source. This article examines the design of a constant-current LED driver that can be used for driving a string of series-connected LEDs. The number of series-connected LEDs can vary from one to several. To drive the LEDs, the power-stage topology is a modified buckboost converter.

View the PDF document for more information.





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