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EE Times-India > Optoelectronics/Displays

Tapped inductor buck converter for 700mA LED power supply

Posted: 16 Sep 2008     Print Version  Bookmark and Share

Keywords:Light emitting diodes  device current  LED string 

Light emitting diodes (LEDs) are rapidly proliferating into commercial and domestic lighting applications because of their high efficiency as light sources. Unlike a conventional incandescent filament type of lamp which appears as essentially a pure resistance and prefers a stable voltage source, the LED requires a special type of power source in which the current is regulated over input line changes and for tolerance variations in the LED's forward voltage drop. The device current must remain constant despite the voltage that may appear across the total LED string. The available power source voltage, however, must be slightly greater than the worst-case total forward voltage drop of the string of LEDs. In applications where user safety is not an issue, and the LEDs are isolated in some type of protective enclosure, the simple off-line buck switching converter is an ideal power source for the LEDs.

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