Patent ID: 8018207
Filing Date: 2011-09-13
Classification: H02M,Y02B

Abstract:
1. A switching regulator which converts an input voltage supplied to an input terminal to a predetermined constant voltage and outputs the constant voltage through an output terminal as an output voltage, comprising: a switching unit that performs switching according to an input control signal; an inductor that is charged by the input voltage in response to the switching of the switching unit; a rectification unit that discharges the inductor when the switching unit is switched OFF and the charging of the inductor stops; a control circuit that controls the switching of the switching unit so that the output voltage becomes the constant voltage, wherein the control circuit uses a pulse signal to perform PWM control on the switching unit, said pulse signal being generated by amplifying an error voltage between the output voltage and a predetermined reference voltage at a gain variable in response to a voltage of a predetermined saw-tooth waveform signal; wherein the control circuit includes wherein the error amplification circuit includes wherein the gain control circuit, according to the saw-tooth waveform signal, changes a bias current to be supplied to each of input transistors constituting a differential pair of the differential amplifier circuit, the output voltage and the reference voltage being input in association with each other to control electrodes of the input transistors, respectively.