Patent ID: 8755201

Claim:
An integrated circuit controller for a power converter having an output that is to be coupled to a load, the controller comprising: a sense input to be coupled to a feedback circuit of the power converter, the sense input for receiving a sense signal that is representative of a reflected voltage, wherein the reflected voltage is representative of the output of the power converter during at least a portion of an OFF time of a power switch, and is representative of an input voltage of the power converter during at least a portion of an ON time of the power switch; a fault detector, wherein the fault detector is to be coupled to detect a fault condition in the feedback circuit in response to the reflected voltage being below a fault threshold for a fault period of time during at least the portion of the ON time of the power switch; and a control coupled to the fault detector, wherein the control is to be coupled to control switching of the power switch to regulate the output of the power converter in response to the sense signal, wherein the control is coupled to inhibit the switching of the power switch in response to the fault detector detecting the fault condition.