Patent ID: 9071125
Filing Date: 2015-06-30
Classification: H02M

Abstract:
1. A switching regulator configured to convert an input voltage input to an input terminal into a predetermined constant voltage by switching with at least two elements including a pair of switching elements or a switching element and a rectifying element, and output the converted voltage as an output voltage from an output terminal, comprising: a comparison unit configured to compare a signal showing an oscillating frequency of the switching regulator with a signal showing a constant frequency; and a driver configured to delay a pulse signal generated by feeding-back a control signal and an output signal of the switching regulator according to the comparison result by the comparison unit with a predetermined time, and switch the input voltage by using the at least two elements based on the pulse signal after the delay, wherein the comparison unit includes an oscillation circuit configured to generate the signal showing a constant frequency, and output the signal, a frequency comparison circuit configured to compare the signal showing the oscillating frequency of the switching regulator with the signal showing a constant frequency, and output a signal corresponding to the comparison result, and a comparator configured to compare a proportional voltage proportional to the output voltage or a composite voltage of the proportional voltage and a ripple voltage generated by a ripple generation circuit with a predetermined reference voltage, and output a signal of the comparison result, and the driver includes a delay circuit configured to delay the output signal of the comparator based on the signal corresponding to the comparison result with a delay time according to the comparison result, and output the output signal, and a driving circuit configured to generate a control signal to the at least two elements based on the output signal of the delay circuit, and output the control signal.