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Controller IC eyes four-quadrant inverter systems

Posted: 03 Oct 2003 ?? ?Print Version ?Bookmark and Share

Keywords:supertex? hv461? ring generator controller ic?

Supertex Inc. has released its HV461 offering, a highly flexible ring generator controller IC that is designed to control a four-quadrant inverter with synchronous secondary rectifiers. Suitable for remote terminal (long and short loops), PBX, DLC, wireless local loop systems, key systems and low power UPS applications, the product features a sine wave synthesizer with digitally-controlled output amplitude and dc offset control that provides reliable and low voice band output ripple voltage.

Requiring the standard -48V telecom supply and a 3.3V power source, the IC eliminates the need for bulky high voltage ring generator power supplies usually used in legacy telecom systems. The inverter topology allows HV461 to achieve an 80 percent efficiency, and drive up to a 40 REN load. This allows the ring generator units to be packaged in small footprints to enable them to be used in high-density telecom linecards.

The PWM control section in the HV461 has four MOSFET drivers that drive two primary side MOSFETS, two synchronous rectifiers on the secondary side and a built-in boost converter in conjunction with a few external components provides the gate drive voltage.

Priced at $9.71 each in 1,000-unit quantities, the HV461 offers eight user-selectable ring frequencies or an external ring frequency, a ringing relay synchronize signal with adjustable lead-time for prolonged relay life and an overload protection for increased system reliability.





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