Patent ID: 8570015
Filing Date: 2013-10-29
Classification: H02M,Y02B

Abstract:
1. A switching voltage regulator comprising: an inductor; a first switch, responsive to a first signal, for charging the inductor during a first period; a second switch, responsive to a second signal, for discharging the inductor during a second period; a control block for varying a duty cycle of the first signal in accordance with a feedback signal representative of an output voltage of the switching voltage regulator; a first comparator for comparing a voltage across the second switch to a first voltage, determining a state of the second switch based on the comparing, and generating a first comparison signal; and a frequency-modulated pulse generator, wherein the control block further comprises a counter for incrementing its count when a transition between levels of the first comparison signal is detected as leading a corresponding transition of a target signal, and decrementing the count when the transition between levels of the first comparison signal is detected as lagging the corresponding transition of the target signal, and wherein the frequency-modulated pulse generator is adapted to vary the duty cycle of the first signal in accordance with the count.