HV461

The HV461FG is a highly integrated ring generator controller IC, designed to work with a patented four-quadrant inverter topology, with synchronous rectifiers on the secondary side to achieve higher efficiencies. The inverter delivers the desired ring voltage from a standard -48V Telecom power supply. The HV461 consists of a sine wave synthesizer that can provide eight different ring frequencies for universal applications. Any other frequency in the 12 to 63Hz range can be obtained by applying an external logic signal to the IC. A transparent latch permits control of the ringer output individually or through the 8-bit bus. The output amplitude and DC offset can be digitally controlled providing high flexibility to the designers. The patented inverter topology using the HV461 controller IC is capable of achieving higher efficiencies, typically over 80%, and drive up to a 40 REN load. The controller allows ring generators to provide a floating 94VAC (rms) waveform that can be referenced to either the -48V or any other offset level by using the programmable offset pins of the IC. Output offset may be achieved by directly generating the offset within the power stage, or by floating the output stage on a DC source, or both.

The HV461 also has an internal boost converter that can be used to provide the gate drive voltages for the two MOSFETS on the primary side and the two secondary rectifiers on the secondary side.