LED DRIVING CIRCUIT AND METHOD FOR PROTECTING FROM HIGH VOLTAGE AND DRIVING WITH CONSTANT CURRENT

PURPOSE: An LED driver circuit and method are provided to drive an LED module with high efficiency by forming a phase compensation function, a constant current function, and a dimming function into a 1shift converter. CONSTITUTION: A rectifier outputs a rectified power source by rectifying an alternating current to a direct current. A buck-boost converter(13) levels the rectified power source using a circuit which includes an inductor and a capacitor. The buck-boost converter outputs the direct current which is boosted or reduced to an LED module. A current sensing part(15) creates first correction voltage by sensing a current flowing in an output side of the buck-boost converter. A voltage sensing part(16) creates second correction voltage by sensing voltage which is generated in the inductor. A PFC controller(14) controls an output of the buck-boost converter based on the first correction voltage and the second correction voltage.