Patent ID: 7782024
Filing Date: 2010-08-24
Classification: H02M,Y02B,Y10S

Abstract:
1. A switching control circuit controlling turning on and off of first and second transistors of a DC-DC converter that generates an output voltage at a target level from an input voltage input to the first transistor by complementarily turning on and off the first and second transistors connected in series, the switching control circuit comprising: an error amplifying circuit configured to output an error voltage obtained by amplifying an error between a feedback voltage corresponding to the output voltage and a lower voltage selected out of a first reference voltage increasing with time passage and a second reference voltage used as a reference for the target level; a comparison circuit configured to output a comparison signal obtained by comparing the feedback voltage with the error voltage output from the error amplifying circuit; and a drive circuit configured to output first and second control signals for controlling the first and second transistors, respectively, in order to turn the output voltage to the target level by complementarily turning on and off the first and second transistors, after the error voltage exceeds the feedback voltage, based on the comparison signal output from the comparison circuit.