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1. (WO2017035394) ADAPTIVE SYNCHRONOUS RECTIFIER CONTROL

Pub. No.:    WO/2017/035394    International Application No.:    PCT/US2016/048770
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Fri Aug 26 01:59:59 CEST 2016
IPC: H02M 3/335
G01R 31/40
H02M 1/32
Applicants: DIALOG SEMICONDUCTOR INC.
Inventors: KONG, Pengju
LIANG, Wenbo
Title: ADAPTIVE SYNCHRONOUS RECTIFIER CONTROL
Abstract:
A switching power converter may include a power switch coupled to a primary winding of a transformer, and a primary controller configured to turn on and off the power switch, a synchronous rectifier switch coupled to a secondary winding of a transformer, and a synchronous rectifier controller configured to turn on and off the synchronous rectifier switch. The synchronous rectifier controller may monitor a voltage across the synchronous rectifier switch. The synchronous rectifier controller may detect a fault condition responsive to the voltage reaching a turn-off voltage threshold before a minimum on-time timer expires. The synchronous rectifier controller may detect a fault condition responsive to the synchronous rectifier switch being turned off at the same time, immediately after, or within a timing guardband after the minimum on-time timer expires. The synchronous rectifier controller may adaptively increase a minimum off-time period for the synchronous rectifier switch.