Abstract
This paper discusses theoretical analysis of the efficiency of a light emitter diode (LED) driver using a charge pump. It is shown that the maximum efficiency of a conventional LED driver using a charge pump is determined only by the ratio of a forward voltage of an LED and a nominal output voltage of a charge pump. Theoretical analysis reveals that the efficiency does not depend on values of flying capacitors and output capacitors, clock frequency, duty cycle and on-resistance of switches. Minimizing the difference of an output voltage of a charge pump and a forward voltage of an LED is important to minimize power loss of an LED driver. In order to reduce power loss caused by charging capacitors, a novel charging procedure named multi-step charging technique is proposed. Some charge pumps using multi-step charging technique are shown and validity of the proposed multi-step charging technique is confirmed.
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