Patent ID: 8054283

Claim:
A light emitting diode (LED) driving circuit, comprising: an LED driving voltage generator which generates a driving voltage to drive an LED; a pulse width modulation (PWM) control unit which outputs a PWM signal having a predetermined duty ratio; and a main switching unit which controls the driving voltage applied to the LED wherein the main switching unit comprises a first switching element, the first switching element controlled by the PWM signal, wherein the PWM control unit comprises: a controller including an error amplifier which detects an error between a reference voltage and the driving voltage and amplifies the detected error; an oscillator which outputs a pulse signal with a predetermined oscillation frequency; and a comparator which compares the pulse signal output from the oscillator with an output voltage from the error amplifier to generate the PWM signal; and a high frequency damper connected to the main switching unit to reduce a peak current generated from the main switching unit; and a current limiter which synchronizes a current applied to the first switching element with the oscillation frequency of a pulse signal output from the oscillator.