LT3543 White LED driver circuit diagram

Published:2011/8/25 21:18:00 Author:Lucas | Keyword: White LED driver | From:SeekIC

The white LED (ILED = 500mA) driver circuit composed of LT3543 is shown in Figure 1. In Figure 1, the ISET1 end is set a 6.19kΩ resistor, and EN1 is used to control the white LED turning on and off. ISET2 is vacant, and EN2 is ground. White LED in the circuit selects LUMILED company's products LXCLLW3C; inductor L1 is TOKO's A997AS-4R7M. Changing the resistor RISETI of ISET1 side can change the white LED current ILED, that can achieve the dimming purpose by changing the brightness of white LED. The white LED dimming has four methods, which are shown in Figure 2.



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