Patent ID: 7091711
Filing Date: 2006-08-15
Classification: H02M,Y02B

Abstract:
1. A switching power supply device comprising: a first power supply terminal; a second power supply terminal; a switching element having a control terminal, a source terminal and a drain terminal, one of the source and drain terminals being coupled to the first power supply terminal; an inductor having a first terminal coupled to the other of the source and drain terminals of the switching element and a second terminal; a first capacitor having a first terminal coupled to the second terminal of the inductor and to be coupled to a load element and a second terminal coupled to the second power supply terminal; a first resistor having a first terminal coupled to the other of the source and drain terminals of the switching element and a second terminal; a second capacitor having a first terminal coupled to the second terminal of the first resistor and a second terminal coupled to the second terminal of the inductor; and a hysteresis comparator having an input terminal coupled to the second terminal of the first resistor and an output terminal coupled to the control terminal of the switching element, the hysteresis comparator comparing a voltage received from the input terminal thereof with a first and a second threshold voltage relating to a hysteresis characteristic thereof and providing a discrimination result to the control terminal of the switching element.