Switching regulator capable of stable operation and improved frequency characteristics in a broad input and output voltage range and method for controlling operation thereof

Abstract

A disclosed switching regulator includes: a switching element switching in accordance with an input control signal; an inductor charged with a supply voltage by the switching of the switching element; a rectifying element discharging the inductor when the switching element is switched off and charging of the inductor is stopped; and a control circuit unit generating an error voltage based on a voltage difference between a proportional voltage and a predetermined reference voltage, generating and outputting a pulse signal with a duty cycle in accordance with the error voltage to a control electrode of the switching element. The control circuit unit generates a feedback voltage from the duty cycle of the pulse signal, generates the pulse signal with the duty cycle from a voltage difference between the generated feedback voltage and the error voltage, and varies the voltage difference from the duty cycle of the pulse signal.