LED DRIVER IC, DRIVING METHOD THEREOF, AND LED EMITTING DEVICE USING THE LED DRIVER IC AND THE DRIVING METHOD

摘要

The present invention relates to an LED driver IC, a driving method thereof, and an LED emitting device using the LED driver IC and the driving method. The LED emitting device includes an LED column, a power switch supplying power to the LED column, a dimming switch controlling the light emitting duty of the LED column, and the LED driver IC controlling the switching operation of the dimming switch. The LED driver IC senses the difference of a sensing voltage generated according to a current flowing to a dimming FET and the control electrode current of the dimming switch, and drives an OCP operation according to the result produced by comparing the sensed voltage drop with a first OCP reference voltage. [Reference numerals] (110) First switching control unit;(130) Second switching control unit;(200) OCP determining unit