Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate

"products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined

to be defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest

product specifications, refer to the Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the

Legal/Disclaimer page on the Supertex website.

HV461FG Ring Generator Controller IC

Features

3.3V operation, logic inputs 3.3V & 5V compatible

Digital control of ring frequency, amplitude, and offset

Control via 8-bit bus or via individual inputs

8 built-in ring frequencies: 16

60Hz

External ring frequency input

Low distortion sine wave synthesizer

AC-only, AC+DC, or DC-only ringer output

Adjustable over-current protection

Internal precision voltage references

Power-on reset and undervoltage lockout for hotswap

capability

Sync output with adjustable lead time for synchronizing

ringing relays

Fault output for problem detection

Open or closed loop operation

Efficient 4-quadrant operation

Zero-cross turn-on with zero-cross turn-off option

Applications

❑

PBX

❑

DLC

❑

Key Systems

❑

Remote Terminal

❑

Wireless Loop Systems

Description

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.

HV461 consists of a sine wave synthesizer that can provide

eight different ring frequencies for universal applications.

Any other frequency in the 12 to 63 Hz range can be

obtained by applying an external logic signal to the IC. A

transparent latch permits control of the ringer output through

the 8-bit bus or individually. 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.

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.

HV461

Initial Release

Typical Application