Patent ID: 8811045

Claim:
A circuit for driving a load, said circuit comprising: a transformer that comprises a primary winding receiving an input voltage, that comprises a secondary winding coupled to said load, that operates in a plurality of switching cycles, wherein a switching cycle of said switching cycles comprises a charging period and a discharging period, wherein during said charging period said transformer is powered by said input voltage and a current flowing through said primary winding increases, and wherein during said discharging period said transformer discharges to power said load and a current flowing through said secondary winding decreases; and a controller, coupled to said transformer, that comprises a pin which receives a first feedback signal indicating said input voltage during said charging period and receives a second feedback signal indicating an electrical condition of said secondary winding during said discharging period, that generates a first control signal according to said first feedback signal to regulate said input voltage, and that generates a second control signal according to said second feedback signal to regulate an output current flowing through said load.