Patent ID: 8207721

Claim:
A switching regulator for converting a supply voltage input to an input terminal into a predetermined constant voltage and outputting the predetermined constant voltage as an output voltage from an output terminal, comprising: a switching element configured to perform switching in accordance with an input control signal; an inductor charged with the supply voltage by the switching of said switching element; a rectifying element configured to discharge said inductor when said switching element is switched off and charging of said inductor is stopped; and a control circuit unit configured to generate an error voltage based on a difference of voltage between a proportional voltage proportionate to the output voltage and a predetermined reference voltage, generate a pulse signal with a duty cycle in accordance with the error voltage, and output the pulse signal to a control electrode of said switching element so as to perform switching control of said switching element, wherein said control circuit unit is configured to generate a feedback voltage in accordance with the duty cycle of the pulse signal, generate the pulse signal with the duty cycle based on a difference of voltage between the generated feedback voltage and the error voltage, vary the difference of voltage in accordance with the duty cycle of the pulse signal, thereby performing feedback control, integrate the pulse signal and add a slope voltage having a voltage tilt in accordance with the duty cycle of the pulse signal to a signal with ripple obtained by the integration so as to generate the feedback voltage.