Techniques are disclosed to control output power from a switching power
supply. A sample power converter controller circuit includes a control
circuit coupled to be coupled to a switch. The control circuit includes a
current sense circuit to be coupled to a primary winding of an energy
transfer element coupled to the switch. The control circuit also includes
a measurement circuit to be coupled to a secondary winding of the energy
transfer element. A feedback circuit is also included and is coupled to
the control circuit and coupled to receive a feedback-signal derived from
an output of a power converter. The feedback circuit is coupled to output
a signal to the measurement circuit. 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 a combination of an output voltage
and an output current of the power converter. A combination of the output
voltage and the output current corresponds to at least one of a regulated
output region and an unregulated output region. At least one of the
unregulated output regions is a self protection auto-restart region.
Within at least one unregulated output region the power converter
controller circuit provides continuous output power at a substantially
maximum output power of the power converter. Each output region
corresponds to a magnitude and duration of the feedback signal.