LT3474 White LED driver circuit diagram

Published:2011/8/29 3:00:00 Author:Lucas | Keyword: White LED driver | From:SeekIC

LT3474 is the step-down DC / DC converter with fixed frequency, the LED driver circuit composed of LT3474 is shown in Figure 3-58. Its internal sense resistor is mainly used to monitor the output current in order to achieve stable and accurate flowing. The device is ideal for driving high current white LED, and it can maintain high output current accuracy in 35mA ~ 1A wide current range in order to achieve a wide dimming range. The dimming range can use PWM pin and an external N-channel MOSFET to further expand and achieve 1000:1 dimming range. LT3474's switching frequency can be programmed in the range of 200kHz ~ 2MHz.



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