TISPPBL2SD
PROGRAMMABLE OVERVOLTAGE PROTECTORS
FOR ERICSSON COMPONENTS PBL 3xxx SLICS
AUGUST 1999
SLIC withstand comparison
SLIC
PBL 3796
PBL 3762A
PBL 386 20/1
CONDITION
V
V
V
V
A
A
-70
+1
V
(-70 V)
-0.1
Bat
continuous
+2
+5
+0.1
Note 1
Note 1
Note 3
Note 6
-70
+5
V
- 20
-2
+2
Bat
pulse < 10 ms
pulse < 1 ms
pulse < 10 µs
pulse < 1 µs
Note 1
Note 1
Note 3
Note 5
Note 5
-5
+5
Note 5
Note 5
-15
+15
Note 5
Note 5
-90
+10
V
- 40
-20
+20
Bat
+10
+15
Note 1
Note 1
Note 3
Note 5
Note 5
-120
+15
V
- 70
-20
+20
Bat
pulse < 250 ns
Note 1, 2
Note 1, 2
Note 4
Note 5
Note 5
Notes: 1. These voltage rating require a diode to be installed in series with the V pin.
Bat
2. R , R ≥ 20 Ω is also required. Pulse supplied to TIP and RING outside R , R
F1
F2
F1
F2
3. A diode in series with the V input increases the permitted continuous voltage and pulse < 10 ms to -70 V.
Bat
A pulse ≤ 1 µs is increased to the greater of |-70 V| or |V - 40 V|
Bat
4. R , R ≥ 20 Ω is also required. Pulse supplied to TIP and RING outside R , R
F1
F2
F1
F2
5. Pulse is applied to TIP and RING outside R and R
P1
P2
6. Permitted continuous voltage for V is -75 V
Bat
A graphical representation is shown in Figure 16. In the positive polarity, the three line types correspond to the
three SLIC types discussed (RP is 2 Ω for the PBL 386 20/1). The two shaded areas represent the positive
and negative maximum limiting voltage levels of the TISPPBL2S as per Figure 2. The negative voltage
withstand capability of the three SLICs is shown relative to their maximum rated battery supply voltage,
VBATM. Figure 16 shows that the TISPPBL2S maximum limiting voltage levels do not exceed the SLIC voltage
withstand ratings.
application circuit
Figure 17 shows a typical TISPPBL2S SLIC card protection circuit. The incoming line conductors, R and T,
connect to the relay matrix via the series over-current protection. Fusible resistors, fuses and positive
temperature coefficient (PTC) resistors can be used for over-current protection. Resistors will reduce the
prospective current from the surge generator for both the TISPPBL2S and the ring/test protector. The
TISP7xxxF3 protector has the same protection voltage for any terminal pair. This protector is used when the
ring generator configuration may be ground or battery-backed. For dedicated ground-backed ringing
generators, the TISP3xxxF3 gives better protection as its inter-conductor protection voltage is twice the
conductor to ground value.
Relay contacts 3a and 3b connect the line conductors to the SLIC via the TISPPBL2S protector. Closing
contacts 3a and 3b connects the TISPPBL2S protector in parallel with the ring/test protector. As the ring/test
protector requires much higher voltages than the TISPPBL2S to operate, it will only operate when the
contacts 3a and 3b are open. Both protectors will divert the same levels of peak surge current and their
P R O D U C T
I N F O R M A T I O N
12
POINN [ POWER INNOVATIONS LTD ]
