Patent ID: 8232674

Claim:
An isolated DC/DC power converter having multiple outputs, the power converter comprising: an input for receiving a DC input voltage; a pre-regulator for generating a regulated DC voltage from the DC input voltage; first and second transformers each having a primary winding and a secondary winding; first and second output circuits coupled to the secondary windings of the first and second transformers, respectively, each output circuit including a synchronous rectifier and one of said multiple outputs; a primary switching circuit having a primary switch, the primary switching circuit coupled between the pre-regulator and the primary winding of each transformer; a first regulation circuit coupled to the synchronous rectifier of the second output circuit; and a control circuit coupled to the first regulation circuit and configured to generate a rectifier control signal for controlling the synchronous rectifiers of said output circuits; wherein the first regulation circuit is configured to provide said rectifier control signal substantially unmodified to the synchronous rectifier of the second output circuit when a voltage at the output of the second output circuit is below a first threshold voltage, and to provide said rectifier control signal with a reduced on-time to the synchronous rectifier of the second output circuit when the voltage at the output of the second output circuit is substantially equal to or greater than the first threshold voltage.