HV461
Initial Release
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
2
/
3
, 20, 25, 33
1
/
3
, 40, 50,
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
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.
Applications
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❑
❑
❑
❑
PBX
DLC
Key Systems
Remote Terminal
Wireless Loop Systems
Typical Application
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.
SUPERTEX [ Supertex, Inc ]
