Switching power supply and control circuit used therefor

Abstract

A switching power supply which can obtain high accuracy of the output voltage without increasing the clock frequency is disclosed. A switching power supply according to the present invention employs an output detector for detecting an output voltage Vo of the switching power supply and a signal generator for generating a switching control signal SW based on the output voltage Vo of the switching power supply. The switching control signal SW includes during each control period Tc a plurality of pulses each having either a first pulse width or a second pulse width different from the first pulse width. According to the present invention, the accuracy of the output voltage Vo can in effect be enhanced by controlling the number of the pulses having the second pulse width in each control period.

Dependencies are inferred from the claim text.