Chu-Hsiang Chia, Pui-Sun Lei, R. Chang, Pei-Wei Ko
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A multi-channel LED driver with accurate current control and adjustable LED numbers
This paper presents a multi-channel LED driver with PFM control which channels are independent of the LED numbers. Every channel can have almost the same driving current under different LED numbers. The current error is only 0.054% that is better than the previous design. It is designed by using TSMC 0.35μm 3.3V/5V CMOS technology. The proposed driver with the novel current balance circuit can have 15.6V output voltage and the maximum loading is 150mA.
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