Patent ID: 7388358

Claim:
A method for generating a pulse-width modulated (PWM) pulse signal for controlling a DC-DC converter, comprising: providing a first clock pulse signal characterized by a first frequency; providing a second clock pulse signal characterized by a second frequency, the second frequency of the second clock pulse signal being higher than the first frequency of the first clock pulse signal; providing a pulse width control signal, the pulse width control signal being characterized with a predetermined initial value; deriving a feedback measurement from the DC-DC converter, the feedback measurement being associated with a difference between an output voltage of the DC-DC converter and a target voltage; making a coarse adjustment to the pulse width control signal in every cycle of the first clock pulse signal, the coarse adjustment being associated with the feedback measurement; making a fine adjustment to the pulse width control signal in every cycle of the second clock pulse signal, the fine adjustment being associated with the feedback measurement; and generating a pulse-width modulated (PWM) pulse signal characterized by a PWM clock frequency, the duty cycle of the PWM pulse signal being characterized by the pulse width control signal.