A controller for a switched mode power converter is disclosed, the switched mode power converter comprising a transformer defining a primary side circuit and a secondary side circuit, the primary side circuit comprising a primary switch, the secondary side circuit comprising a synchronous rectification switch, the controller comprising: a baseline off-set circuit configured to provide a baseline timing off-set between opening the synchronous rectification switch and closing the primary switch; a peak current detector configured to detect a peak negative current in the secondary side circuit; and a feedback circuit configured to add an off-set adaptation to the baseline timing off-set to provide an adapted timing off-set, wherein the feedback circuit is configured to adjust the off-set adaptation to minimize the negative peak current.A switched mode power converter and electronic equipment using such a controller is also disclose, as is a method for controlling a switch mode power converter.