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In this paper, a new active current balancing method for a light-emitting diode (LED) driver with multichannel outputs is proposed. In the proposed structure, a low-power nonisolated dc–dc converter in series with each LED string is used to regulate the LED string current. Different from conventional active current balancing methods, in the proposed method, the nonisolated dc–dc converters only process...
This research describes an integrated multi-channel high accuracy current control LED driver with low dropout regulator implemented in a 0.35um TSMC 2P4M CMOS process. With the new trend of backlighting applications for mobile electronics and portable devices requiring a smaller size, lower cost, lesser noise and accurate current control LED driver, it came up with the idea of integrating more than...
A novel multi-channel LED driver is presented, consisting of an active current regulator and a switch mode voltage regulator for each channel. The active current regulator directly controls an LED current without any current sensing resistor and the switch-mode voltage regulator minimizes a voltage drop at the current regulator, independently for each channel. This is named self-optimization. This...
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