Patent ID: 8415932
Filing Date: 2013-04-09
Classification: H02M

Abstract:
1. A switching control circuit comprising: an N-channel MOSFET having an input electrode applied with an input voltage and an output electrode connected to one end of an inductor and one end of a rectifying element, the other end of the inductor connected to a first capacitor; a bootstrap circuit configured to generate a bootstrap voltage on a second capacitor having one end connected to the output electrode of the N-channel MOSFET, the bootstrap voltage required when the N-channel MOSFET is turned on; a driving circuit configured to be applied with a driving voltage corresponding to the bootstrap voltage and turn on/off the N-channel MOSFET to generate an output voltage of a target level on the first capacitor; and a clamping circuit connected in parallel with the second capacitor and configured to clamp the driving voltage to be at a predetermined level or lower.