DC-DC converter, control circuit and information processing system

摘要

A DC-DC converter includes: an inductor provided between a power input node and a power output node; a plurality of switching elements which switch an input route of a power toward the inductor and a discharge route of the power from the inductor; a first pulse generation circuit which generates a first pulse based on a feed-back signal according to an output of the output node; a second pulse generation circuit which generates a second pulse having a second frequency being equal to or higher than a first frequency set as an upper limit of a human audible frequency band; a driver which drives the switching element based on one of the first pulse and the second pulse; and a control circuit which supplies the first pulse or the second pulse to the driver based on a load state of a load coupled to the output node.

主权项

1. A DC-DC converter, comprising:
an inductor provided between a power input node and a power output node; a plurality of switching elements which switch an input route of a power toward the inductor and a discharge route of the power from the inductor; a first pulse generation circuit which generates a first pulse signal based on a feed-back signal according to an output of the output node; a second pulse generation circuit which generates a second pulse signal having a second frequency being equal to or higher than a first frequency set as an upper limit of a human audible frequency band; a driver which drives a switching element based on one of the first pulse signal and the second pulse; and a control circuit which switches between supplying the first pulse signal or the second pulse signal to the driver based on a load state of a load coupled to the output node by controlling a triangular wave signal to be supplied to the second pulse generation circuit, wherein the controller supplies the first pulse to the driver by supplying the triangular wave signal to the second pulse generation circuit and supplies the second pulse to the driver by supplying a given voltage to the second pulse generation circuit.