Patent ID: 7986149

Claim:
A method for sensing an output fault condition, the method comprising: monitoring an error signal, the error signal indicating the output fault condition; monitoring an input signal, the input signal comprising a duration; setting an error flag if the error signal is asserted within an observation frame and if a fast switching mode is detected, the observation frame comprising a specified time interval during the input signal duration, wherein the specified time interval begins at a first specified period of time before an end of the input signal duration, and the specified time interval ends at an end of the input signal duration; and selecting a switching mode, the selecting comprising measuring a period of time the error signal is not asserted; asserting a normal switching mode if the period of time the error signal is not asserted exceeds a second specified time period, and asserting the fast switching mode if the period of time the error signal is not asserted does not exceed the second specified time period.