| 摘要 |
A LED driving circuit includes a regulator to provide an output voltage to a LED light source, a current source to control the driving current of the LED light source, and a controller to detect the voltage of the current source to generate a control signal for the regulator to regulate the output voltage at a low level. There are no resistors on the current path established by the LED light source and current source, and the regulator may maintain the voltage of the current source as low as possible, thereby improving the power efficiency and reducing the power consumption.
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