The HV9606 PWM controller allows the design of high efficiency (>90%) power supplies for distributed board mounted power (BMP) applications. Due to its high frequency capability it can provide high currents (20A @ 3.3V) with small transformers and due to its low internal operating voltage and current is also able to achieve high efficiencies in low power applications. The HV9606 utilizes fixed frequency current mode control with duty cycle internally limited to <50%. It supports both isolated and nonisolated topologies and provides all the necessary functions to implement a flyback, forward or synchronous forward converter with a minimum of external parts. Due to its low VDD operation the bootstrap magnetic winding is eliminated in non-isolated topologies. An on chip charge pump generates the gate drive voltage for driving an external N-channel MOSFET and eliminates the need for clamping by offering 250V immunity to high voltage transients common in telecom and network systems. It conforms to the requirements of IEEE 802.3 Powered Ethernet and ETR-080 ISDN specifications.