1. A synchronous rectification (SR) controller for controlling an SR switch of a switched-mode power converter having an output winding, the SR controller comprising:a first input for sensing a first voltage at a first terminal of the output winding;
a first voltage divider for reducing the first voltage, thereby providing a reduced first voltage;
a second input for sensing a second voltage at a second terminal of the output winding;
a second voltage divider for reducing the second voltage, thereby providing a reduced second voltage;
a volt-second determiner configured to input the reduced first voltage and the reduced second voltage, and provide a volt-second output based upon the reduced first and second voltages, wherein the volt-second output corresponds to a winding current through the output winding; and
an SR switch turn-off signal generator configured to generate an SR switch turn-off signal based upon the volt-second output and a first reference.