Dimming Circuit, A Light Emitting Diode Driver Including The Same And A Light Emitting Diode Driver

摘要

The dimming circuit includes a reference signal generation unit, a frequency modulation unit and a duty cycle control unit. The reference signal generation unit generates a reference signal. The frequency modulation unit generates a frequency modulation signal having an initial frequency based on the reference signal and a control signal, repeatedly performs a counting operation that counts at least one pulse of the frequency modulation signal, and adjusts the frequency of the frequency modulation signal if the counting operation is completed. The duty cycle control unit generates a pulse width modulation (PWM) output signal by adjusting a duty cycle of the frequency modulation signal.