Switching power supply circuit

摘要

A switching power supply circuit includes: a voltage generation circuit that generates an output voltage by smoothing, with a capacitor, a voltage produced in an inductor; an integration circuit that integrates a switching voltage to generate a first ripple voltage including a first ripple component; a feedback voltage generation circuit that divides the output voltage to generate a feedback voltage; a comparison circuit that compares the feedback voltage with a reference voltage to output the result of the comparison as a comparison result signal; an integration circuit that integrates the comparison result signal to generate a second ripple voltage including a second ripple component; and a drive circuit that controls the turning on and off of a switch element based on the comparison result signal, where the first ripple component and the second ripple component are added to the feedback voltage.

主权项

1. A switching power supply circuit that generates an output voltage from an input voltage supplied from a power supply, the switching power supply circuit comprising:
a voltage generation circuit that generates the output voltage from the input voltage by smoothing, with a capacitor, a voltage produced in an inductor based on turning on and off of a switch element; a first integration circuit that integrates a switching voltage produced by the turning on and off of the switch element to generate a first ripple voltage including a first ripple component; a feedback voltage generation circuit that divides the output voltage to generate a feedback voltage; a comparison circuit that compares the feedback voltage input to a first input terminal with a reference voltage input to a second input terminal to output a result of the comparison as a comparison result signal; a second integration circuit that integrates the comparison result signal to generate a second ripple voltage including a second ripple component; and a drive circuit that controls the turning on and off of the switch element based on the comparison result signal, wherein the first ripple component and the second ripple component are added to the feedback voltage input to the first input terminal.