PC-R302-925 Microsemi Corporation, PC-R302-925 Datasheet - Page 3

• Manufacturer Part Number: PC-R302-925
• Description: 30 Watt Sine Wave Telephone Ring Generator
• Manufacturer: Microsemi Corporation

Output Amplitude Setting
The PC-R302-925/926 ring generator output amplitudes may be set
to any value in the range of 45Vrms to 86Vrms. The PC-R302-825
ring generator has an extended output amplitude range of 50-
95Vrms. The PC-R302-543 ring generator output amplitude is set to
86Vrms.
The V0 input terminal (pin 10) controls the output amplitude in digital
and analog operation modes. When V0 is set to <1V in reference to
the DGND terminal (pin 12), or shorted to DGND, the output
amplitude is set to its default 75Vrms value. When V0 >4V or V0 is
left open, the output voltage is sets to 86Vrms. When applying to V0
voltage in the range of 1.152V to 3.804V the device changes to its
analog amplitude setting mode, and sets its output amplitude
according to the table below. Any output voltage setting will take
effect only at startup, by power connection or by Inhibit command.
Rset [KΩ] = 10 * Vset / (5 − Vset)
Zero Crossing Synchronization Output
The SYNC output terminal (pin 9) provides a square wave at the ring
generators output frequency and phase. The output is an open
collector referenced to the FGND terminal (pin 6). This output may
provide up to 30V signal level by using an external pull up voltage.
This can be used to synchronize relay switching with output's zero
crossing. When the ring generator shuts down as a result of shorted
output, over-temperature or disconnected input voltage, this output
will revert to a high level.
Minimum V0
Voltage
In reference
to DGND
Mode, 4.0V
Mode, 0V
1.152 V
1.308 V
1.464 V
1.620 V
1.776 V
1.932 V
2.088 V
2.244 V
2.400 V
2.556 V
2.712 V
2.868 V
3.024 V
3.180 V
3.336 V
3.492 V
3.648 V
3.804 V
Digital
Digital
Maximum V0
Voltage
in reference
to DGND
1.308 V
1.464 V
1.620 V
1.776 V
1.932 V
2.088 V
2.244 V
2.400 V
2.556 V
2.712 V
2.868 V
3.024 V
3.180 V
3.336 V
3.492 V
3.648 V
3.804 V
3.960 V
1.0 V
5.0 V
Output
Amplitude
Vrms
PC-R302-925/926
75.0 Vrms
45.0 Vrms
47.0 Vrms
49.5 Vrms
52.0 Vrms
54.0 Vrms
56.0 Vrms
58.0 Vrms
60.0 Vrms
62.5 Vrms
65.0 Vrms
67.0 Vrms
70.0 Vrms
73.0 Vrms
75.0 Vrms
77.5 Vrms
80.0 Vrms
83.0 Vrms
86.0 Vrms
86.0 Vrms
Output
Amplitude
Vrms
PC-R302-825
85.25 Vrms
82.5 Vrms
50.0 Vrms
52.0 Vrms
54.5 Vrms
57.0 Vrms
54.0 Vrms
59.5 Vrms
58.0 Vrms
64.0 Vrms
69.0 Vrms
65.0 Vrms
71.5 Vrms
77.0 Vrms
80.0 Vrms
82.5 Vrms
88.0 Vrms
91.5 Vrms
95.0 Vrms
95.0 Vrms
LOW PROFILE 30 Watt Sine Wave Telephone Ring Generator
Output Frequency Setting
The PC-R302-925/926/825 ring generator supports all four popular
output frequencies: 17, 20, 25 and 50Hz. The F0 (pin 8) and F1 (pin
11) input terminals select the device output frequency by TTL logic
levels referenced to the DGND terminal (pin 12). Changes take
effect at startup, by power connection or by Inhibit command
activation. The PC-R302-543 ring generator output frequency is set
to 25Hz.
Other output frequencies, in the range of 15Hz to 50Hz, in 1Hz
resolution may be ordered.
Test Output Signal
The Test output terminal (pin 5), based on an independent internal
circuit, provides an open collector logic high level, referenced to the
FGND terminal (pin 6), to indicate proper functioning of the ring
generator output. A low logic level appears at this terminal when one
of the following occurs: Output Overcurrent, Over Temperature, Vin
Undervoltage/Overvoltage, High Logic Level at the Inhibit Control
Terminal or an Output Overvoltage. While the unit is normally
operated, this output will be at high level. The Test Output Signal can
be used as ‘Output Good Signal’.
Ring Generator Fault Detection
A Ring Generator Fault Detection indication can be achieved using
the Test, the Sync and the Inhibit Outputs, as seen below::
*Load > 30VA = Overload
Output DC Biasing
Since the ring generator's output is isolated and floating, it can be
superimposed on negative or positive DC voltage. When this DC bias
option is utilized it is recommended to follow the connections
described in the Typical Application 2 schematics.
Output Frequency
Over-Temp., Internal Temp. >100°C
Inhibit
"1”
"0"
"0"
"0"
X
17Hz
20Hz
25Hz
50Hz
Normal
Load*
Over-
Short
Load
Conditions
X
X
Under/Over or
Disconnected
Input Voltage
Input Voltage
F1
"0" ref. To DGND
"0" ref. To DGND
"1" or disconnected
"1" or disconnected
Normal
Normal
Normal
Normal
Output
Ampli-
Lower
tude
Off
Off
On
Off
Off
F0
"0" ref. to DGND
"1" or disconnected
"1" or disconnected
"0" ref. to DGND
PC-R302 Series
Status
Square
Square
Wave
Wave
Sync
"1"
"1"
"1"
"1"
PC-R302 Series
Test
"0"
"0"
"1"
"1"
"0"
"0"