DC-DC converter control circuit and DC-DC converter

摘要

A DC-DC converter control circuit has an inductor configured to be interposed between a first node which is set to a first direct current voltage or a second direct current voltage and a second node which outputs an output voltage at a predetermined direct current voltage level, an error signal generator configured to generate an error signal depending on a voltage difference between a reference voltage and a voltage correlating with the output voltage, a ripple extractor configured to extract and output ripple components contained in the voltage of the first node, a single-ended signal generator configured to generate a single-ended signal based on the error signal and an output signal from the ripple extractor, and a switch drive unit configured to drive and control, based on the single-ended signal, a switch circuit which sets the first node to the first direct current voltage or the second direct current voltage.

主权项

1. A DC-DC converter control circuit comprising:
an inductor which is interposed between a first node that is set to one of a first direct current voltage and a second direct current voltage and a second node that outputs an output voltage at a predetermined direct current voltage level; an error signal generator which generates an error signal depending on a voltage difference between a reference voltage and a voltage correlating with the output voltage; a ripple extractor which extracts and outputs ripple components contained in a voltage of the first node; a single-ended signal generator which generates a single-ended signal based on the error signal and an output signal from the ripple extractor; and a switch drive unit which drives and controls, based on the single-ended signal, a switch circuit which sets the first node to the one of the first direct current voltage and the second direct current voltage, wherein the error signal generated by the error signal generator is a current signal, and wherein the single-ended signal generator generates the single-ended signal by removing direct current voltage components contained in the output signal from the ripple extractor, and converting the current signal into a voltage signal through integration.