The base drive circuit of white light LED

Published:2011/8/11 5:24:00 Author:nelly | Keyword: drive circuit, white light LED | From:SeekIC

Composed of switch converter, the base drive circuit of white light LED is shown in the figure1, the general switch converter controls the converter's output voltage after the feedback voltage UFB and internal reference voltage UREF are compared. If the environmental brightness signal is introduced into the LED brightness control circuit, then the white light LED drive circuit which is shown in the figure1 is changed into the circuit in the figure 2. The difference between figure1 and 2 is: the circuit in the figure 2 has Tr1, resistance R1, R2 and OP amplifier IC1.



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