The LED circuit driven by the regulated electric charge pump

Published:2011/8/21 21:38:00 Author: | Keyword: electric charge pump, LED | From:SeekIC

SP6682 regulated electric charge pump drive LED circuit is shown in the figure. SP6682 includes an internal 500KhZ oscillator, which is used to drive the pump capacitance normally and double the input voltage. In the figure, the circuit is not adopting with the pump capacitor, but adding the oscillator output on the 7-pin and driving VT conduction and breakdown. VT1, L1, VD1 and C1 compose a booster regulator, which can raise the voltage on the two poles of C. When the voltage surpasses the LED forward voltage drop, the current is starting to run.



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