3W High-power LED Drive Circuit

Published:2011-7-18 1:01:00 Author:Sue | Keyword: High-power, LED, Drive | From:SeekIC

The high-power LED easy driver is the one used in the high-power white light, but the difference is that I here use the 3W LED. The circuit will input1.2v working voltage(high capacitance NI-MH battery).The current is about 1.4-1.8A, which has a poor efficiency of about 70%. If the 150Ω resistor is replaced by a 200Ω one, and the input current is reduced to 1.0-1.3A, then a little copper sheet of an area of 3 cm² should be added on that D882 for heat radiation. I used a diagonal plier to remove the head of D882(to reduce the volume), and then welded it on the copper sheet directly.

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