Patent ID: 8872497
Filing Date: 2014-10-28
Classification: H02M

Abstract:
1. A switched-mode power supply, comprising: an inductor which is connected between a voltage input terminal to which a DC voltage is input and an output terminal to which a load is connected; a driver switching element which intermittently feeds a current to the inductor; and a control circuit which generates a control pulse according to a feedback voltage from an output side and which controls on/off of the driver switching element, wherein the switched-mode power supply outputs a voltage having a level different from an input voltage, wherein the control circuit comprises: wherein the pseudo ripple generator circuit comprises: wherein the control circuit injects a ripple component in a transmission path of the feedback voltage based on the pseudo ripple voltage generated by the pseudo ripple generator circuit, and wherein the voltage comparison circuit is a comparator with four inputs including a first differential input stage and a second differential input stage, wherein the feedback voltage and the predetermined voltage are input into the first differential input stage, and the wave form voltage and a reference voltage are input into the second differential input stage.