Patent ID: 6930526
Filing Date: 2005-08-16
Classification: H02M

Abstract:
1. A circuit, comprising: a power storage element to generate a DC output voltage from an input voltage; an output sampler to generate a feedback signal from the output voltage; an error amplifier to generate an error signal from the feedback signal; a ramp generator to generate a ramp signal from the error signal, wherein the compared voltage is a preset substantially constant voltage; a comparator to generate a pulse signal by comparing the ramp signal and a compared voltage, wherein one of the ramp signal and the compared voltage is generated from the error signal; and a power switch to switch the power storage element on and off as controlled by the pulse signal, wherein the pulse signal is generated such that, if the input voltage changes within a first range, a width of pulses of the pulse signal changes so as to maintain the output voltage substantially constant.