In accordance with an embodiment, a method of operating a switched-mode power includes turning on an output switch of the switched-mode power converter coupled to a supply output port of the switched-mode power converter, where an output switch current flows to the supply output port through the output switch in a first direction after turning on the output switch. The method further includes turning off the output switch a first period of time after the output switch current changes polarity from the first direction to a second direction opposite the first direction.