DC-DC DC-DC converter having a device to cope with change of input voltage

摘要

The present invention relates to a technology of correcting an output voltage in accordance with a change in an input voltage of a DC-DC converter. The DC-DC converter comprises: a switching-type DC voltage converting unit; a PWM waveform signal control unit for generating a PWM waveform signal provided for an operation of a switch included in the DC voltage converting unit, wherein a duty of the PWM waveform signal is determined by a feedback voltage input to the PWM waveform signal control unit; and a feedback circuit unit for generating the feedback voltage. The feedback voltage is generated by subtracting a value proportional to a DC input voltage input to the DC voltage converting unit from a value proportional to an error voltage proportional to the difference between a value of a DC output voltage output by the DC voltage converting unit and a predetermined reference voltage.