HV9606

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 non-isolated 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.

The oscillator HV9606 is programmable and provides fault tolerant peer-to-peer synchronization to other similar circuits or master clock. The chip draws almost no current (<6A @ VIN < 20V) until the programmable START/STOP thresholds of the start-up regulator are satisfied. It can also be powered via the VDD pin, rather than the VIN pin, in the range of 2.9V to 5.5V.

Other functions include leading edge current sense blanking, programmable SOFT START, precision !1% band gap reference and a SUPERVISOR CIRCUIT. The SUPERVISOR can provide housekeeping functions such as P supply monitoring and reset, soft start inhibit for rapid restart on short duration input voltage interruption. HV9606 also minimizes input and output capacitance requirements.