Patent ID: 8598810
Filing Date: 2013-12-03
Classification: H05B

Abstract:
1. A constant current driving circuit of a light emitting diode (LED), comprising: a control unit, having a first input terminal and a first output terminal, and outputting a control signal through the first output terminal; a buck converter, coupled to an input power, and coupled between the first output terminal of the control unit and an LED string; and a compensation unit, directly coupled between the LED string and the first input terminal of the control unit, wherein the control unit receives a compensation signal of the compensation unit through the first input terminal, wherein the compensation unit comprises: a compensation resistor, coupled between the LED string and the first input terminal of the control unit; a first resistor, having a first end coupled to the compensation resistor and a second end directly coupled to ground; and a filter resistor, having a third end directly coupled to the compensation resistor and a fourth end directly coupled to the first end of the first resistor.