Patent ID: 6642696
Filing Date: 2003-11-04
Classification: H02M,Y02B

Abstract:
A DC-DC converter comprising:a switching circuit having a first switching element that is connected between a voltage input terminal and an output node and that becomes conductive in correspondence with an input pulse signal; a filter circuit having an inductance element, which has a parasitic resistance component, connected between said output node and the voltage output terminal, and a first capacitance element, which has a parasitic resistance component, connected between said voltage output terminal and a reference voltage terminal; a feedback controller that generates a control voltage in correspondence with the voltage output from said output node; and a pulse width modulator that generates said pulse signal, which controls the pulse width in correspondence with said control voltage, and sends it to said switching circuit and wherein said feedback controller has a first resistance element and a second resistance element connected between said outcut node and said reference voltage terminal, a second capacitance element connected between said voltage output terminal and the midpoint of the connection between said first and second resistance elements, and an amplifier circuit that takes the voltage at the midpoint of the connection between said first and second resistance elements and said reference voltage as inputs, and outputs said control voltage.