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| HV461FG-G Datasheet, PDF (1/14 Pages) Supertex, Inc – Ring Generator Controller IC | |||
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HV461
Ring Generator Controller IC
Features
⺠3.3V operation, logic inputs 3.3V & 5.0V compatible
⺠Digital control of ring frequency, amplitude, and offset
⺠Control via 8-bit bus or via individual inputs
⺠8 built-in ring frequencies: 12, 162/3, 20, 25, 331/3, 40,
50, 60Hz
⺠External ring frequency input
⺠Low distortion sine wave synthesizer
⺠AC-only, AC+DC, or DC-only ringer output
⺠Adjustable over-current protection
⺠Internal precision voltage references
⺠Power-on reset and undervoltage lockout for hotswap
capability
⺠Sync output with adjustable lead time for synchronizing
ringing relays
⺠Fault output for problem detection
⺠Open or closed loop operation
⺠Efï¬cient 4-quadrant operation
⺠Zero-cross turn-on with zero-cross turn-off option
Applications
⺠PBX
⺠DLC
⺠Key Systems
⺠Remote Terminal
⺠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 rectiï¬ers on the secondary side
to achieve higher efï¬ciencies. 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
ï¬exibility to the designers. The patented inverter topology
using the HV461 controller IC is capable of achieving higher
efï¬ciencies, typically over 80%, and drive up to a 40 REN
load.
The controller allows ring generators to provide a ï¬oating
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
ï¬oating 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
rectiï¬ers on the secondary side.
Typical Application Circuit
Current Sense
Xtal
+3.3V
VDD Gate Drive
Out
â I/O
HV461FG
-48V
-48V
0V
OR
-48V
94VAC(rms)
â 1235 Bordeaux Drive, Sunnyvale, CA 94089 â Tel: 408-222-8888 â www.supertex.com
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