Patent ID: 7554826

Claim:
A power converter controller circuit, comprising: a control circuit to be coupled to a switch, the control circuit including a current sense circuit to be coupled to a primary winding of an energy transfer element coupled to the switch, the control circuit further including a measurement circuit to be coupled to a secondary winding of the energy transfer element; a feedback circuit coupled to the control circuit and coupled to receive a feedback-signal derived from an output quantity of a power converter and to output a signal to the measurement circuit, wherein an output of the measurement circuit and an output of the current sense circuit are coupled to control a switching of the switch to regulate an output voltage or an output current of the power converter, wherein the power converter control circuit controls the switching of the switch to operate the power converter in a regulated output region, a first unregulated output region and a second unregulated output region responsive to a magnitude and duration of the feedback signal, wherein the magnitude and duration of the feedback signal correspond to a combination of the output voltage and the output current, wherein the first unregulated output region is a self protection auto-restart region, wherein the second unregulated output region is an expanded unregulated transition region of the power converter controller circuit providing continuous output power at a substantially maximum output power of the power converter, wherein a current limit of the power converter controller circuit is independent of the magnitude of the feedback signal during the second unregulated output region: and an oscillator included in the control circuit to produce a clock signal that defines switching cycles of the switch.