HV461_13 Datasheet, PDF (1/14 Pages) Supertex, Inc – Ring Generator Controller IC

Supertex inc.
HV461
Ring Generator Controller IC
Features
►► 3.3V operation, logic inputs 3.3V & 5.0V compatible
►► Digital control of ring frequency, amplitude, and offset
►► Control via 8-bit bus or via individual inputs
►► 8 built-in ring frequencies: 12, 16²/₃, 20, 25, 33¹/₃, 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
Applications
►► PBX
►► DLC
►► Key Systems
►► Remote Terminal
►► Wireless Loop Systems
General 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.
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.
Typical Application Circuit
+3.3V
I/O
-48V
Current Sense
Xtal
VDD _{Gate Drive}
Out
HV461
-48V
0V
OR
-48V
94VAC(rms)
Doc.# DSFP - HV461
C071913
Supertex inc.
www.supertex.com