Patent ID: 7868598
Filing Date: 2011-01-11
Classification: H02M

Abstract:
1. A switching circuit for a switching regulator, the switching circuit comprising: a hysteresis comparator; a switching element switched based on an output of the hysteresis comparator; a first terminal arranged to output a signal corresponding to a switching operation of the switching element; a second terminal arranged to receive an output voltage of the switching regulator; a first resistor having one end connected to the second terminal and having another end connected to an inverting input terminal of the hysteresis comparator; a second resistor having one end connected to the other end of the first resistor and having another end connected to a fixed potential; a first capacitor having one end connected to the second terminal and having another end connected to the inverting input terminal of the hysteresis comparator; a third resistor having one end connected to the inverting input terminal of the hysteresis comparator; and a second capacitor having one end connected to another end of the third resistor and having another end connected to an output terminal of the hysteresis comparator, wherein the hysteresis comparator is arranged to compare a reference voltage with a voltage obtained by superimposing a ramp signal generated from an alternating-current component in an output of the hysteresis comparator by the third resistor and the first capacitor on a divided voltage obtained by dividing the output voltage of the switching regulator with the first resistor and the second resistor.