Patent ID: 8664929

Claim:
A control method for audio-skipping of a constant on-time power converter which determines a valley point of an output voltage with reference to a reference voltage, triggers a constant on-time of a high-side switch whenever a feedback signal related to the output voltage decreases to the reference voltage, and turns off a low-side switch whenever an inductor current decreases to zero, the control method comprising the steps of: detecting a switching frequency of the power converter; responsive to the switching frequency decreasing to a threshold, counting an off-time of the high-side switch, and triggering a first signal to forcibly turn on the high-side switch responsive to the off-time reaching a threshold; providing a bias voltage to shift the reference voltage or the feedback signal for determining a peak point; and switching the power converter to a mode in which a constant off-time of the high-side switch is triggered whenever the output voltage reaches the peak point.