公开(公告)号：US20170126122A1

公开(公告)日：2017-05-04

申请号：US14932705

申请日：2015-11-04

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Monodeep KAR ,  Saurav BANDYOPADHYAY ,  Jeffrey MORRONI

IPC: H02M3/158

CPC classification number: H02M3/1588 ,  Y02B70/1466

Abstract: A power converter includes a power stage having a switch-node of a switched-mode power supply that is coupled to an input voltage node by a power field-effect transistor (FET) to energize an inductive circuit and is coupled to a ground node by a synchronous rectifier in parallel with the inductive circuit. The power converter also includes a controller coupled to the power stage. The controller controls switching of the power FET and synchronous rectifier in a complimentary manner. The controller switches on the power FET during a first switching cycle. Subsequently, the controller switches on the synchronous rectifier and, in response to a current through the inductive circuit being approximately zero, switches off the synchronous rectifier. Subsequently, the controller switches on the synchronous rectifier again to generate a negative current through the inductive circuit prior to entering a second switching cycle.