Patent ID: 8315072
Filing Date: 2012-11-20
Classification: H02M

Abstract:
1. A switching power supply comprising: an inductor including a coil; a chopper circuit configured to chop a primary current drawn through the coil, for the inductor to output an induced current; a multifunction junction having a multifunction voltage that is a function of a primary voltage that drives the coil; a first circuit configured to suspend the chopping in response to a first sensed voltage crossing a first threshold, the first sensed voltage being a function of the multifunction voltage; and a second circuit configured to suspend the chopping in response to a second sensed voltage crossing a second threshold, the second threshold being a function of the multifunction voltage, wherein the second circuit is a burst mode circuit that suspends the chopping when the power supply's output current, flowing through a load, exceeds a current threshold that is a function of the multifunction voltage.