PCR-SIN15V48F00
15REN@86Vrms to 40REN@45Vrms SINE WAVE TELEPHONE RING GENERATOR
PCR-SIN15V48F00
Zero Crossing Synchronization Output
The SYNC output provides a high TTL level pulse to indicate the AC
output voltage zero crossing, relative to the output sine wave. This is
useful for prolonging relay life by timing switching with the ringing
signal zero crossing. The SYNC signal rises to a high TTL level,
referenced to V(-), 2.5mSec prior to the zero crossing and remains at
high level for about 5mSec. When the unit is set to a 50Hz ringing
frequency, the SYNC signal rises to a high TTL level 2.0mSec prior to
the zero crossing and remains at high level for 4mSec.
Output DC Biasing
The ring generator’s output is isolated and floating and can be
superimposed on negative or positive DC voltage. When the DC
biasing option is utilized (see Typical Application 2), a series
protection resistor should be added in to each port (i.e. telephone
extension). This resistor should limit the potential DC current through
the unit’s output stage should the output be shorted. The
recommended minimum values for these serial resistors are
proportionate to the DC bias.
Output DC Bias
Series Protection Resistor
± 12Vdc
47
Ω
± 24Vdc
100
Ω
± 48Vdc
200
Ω
± 75Vdc
350
Ω
In the event that high frequency switching noise from the ring
generator input reflects on the output via the Talk Battery line, a filter
of a 22-100
µF capacitor and a 10-20Ω resistor should be added.
When the Inhibit terminal is enabled, no AC/DC voltage exists on the
Ring Generator’s output.
Input Voltage Supply
The PCR-SIN15V48F00 ring generator features a wide range of input
voltage capabilities. These capabilities are achieved by utilizing a
sophisticated feed forward topology, which continuously samples the
input voltage. The units output amplitude is then regulated for line
changes. Low frequency ripple on the input may be interpreted as
line changes and reflect on the output. Therefore, it is essential to
restrain the input’s ripple. Acceptable levels are specified in the
PERFORMANCE/FUNCTIONAL SPECIFICATIONS.
Connecting an input
capacitor, as illustrated in the Typical
Applications may reduce high frequency ripple on the input, which
originates from the units internal 100kHz switching frequency.
Case Shielding
The SHIELD terminal is connected to the device’s metal case. The
terminal may be connected to grounded systems in order to reduce
radiated EMI.
Output Frequency Control
Each PCR-SIN15V48F00 ring generator supports all four popular
output frequencies: 16.7, 20, 25 and 50Hz. The frequency selection is
controlled by TTL levels, referenced to V(-), or by jumpering the F0
and F1control pins to the V(-), according to the following table:
Frequency
F1
F0
16.7Hz
"0" or tied to V(-)
"1" or disconnected
20Hz
"1" or disconnected
"1" or disconnected
25Hz
"1" or disconnected
"0" or tied to V(-)
50Hz
"0" or tied to V(-)
"0" or tied to V(-)
The F0 and F1 terminals are pulled up to an internal 5V source in
reference to the V(-) terminal. For digital frequency control, use either
an open collector or an opto-coupler driver. When utilizing digital
frequency control or frequency setup jumpers that are connected via
long conductors to the ring generator, the addition of two 47nF noise
filtering capacitors between F0 and the V(-) and between the F1 and
the V(-) terminals is advised.
Frequency changes take effect at start-up by power connection or by
the Inhibit control. Frequency setup changes while the output is on
may disturb normal operation.
100
µF
PCR-SIN15
V(+)
V(-)
O1
O2
F1
F0
47nF
47nF
TYPICAL APPLICATION 2
Output AC is superimposed on DC bias – A single 48Vdc power supply is used for the Ring Generator feeding and for the output biasing
Vin
48Vdc
Series Protection Resistors
PCR-SIN15
V(+)
V(-)
O1
O2
Fuse
2A/250V
100
µF
Telephone
Ports
22-100
µF
10-20
Ω
Note: A 0.1
µF ceramic capacitor on each output line from the PCR-SIN15V48F00 Ring Generator prevents the possibility of the high switching
frequencies causing interference down the line.
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