DIMMING CIRCUIT FOR LIGHT EMITTING DIODE DRIVER AND LIGHT EMITTING DIODE DRIVER INCLUDING THE SAME

摘要

PURPOSE: A dimming circuit for a light emitting diode driver and a light emitting diode driver including the same are provided to improve an EMI(Electro Magnetic Interference) property by generating a frequency modulation signal and a PWM(Pulse Width Modulation) output signal. CONSTITUTION: A reference signal generating part(1100) generates a reference signal. The reference signal determines an initial frequency of a frequency modulation signal. A frequency modulation part(1200) generates the frequency modulation signal. The frequency modulation part changes the frequency of the frequency modulation signal. A duty cycle control part(1300) controls a duty cycle of the frequency modulation signal and generates a pulse width variable output signal.