TISPPBL1D, TISPPBL1P, TISPPBL2D, TISPPBL2P
DUAL FORWARD-CONDUCTING P-GATE THYRISTORS
FOR ERICSSON COMPONENTS SLICS
AUGUST 1997 - REVISED DECEMBER 1999
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.
SERIES
RESISTANCE
RING/TEST
PROTECTION
SLIC
PROTECTION
TEST
RELAY
RING
RELAY
SLIC
RELAY
T
WIRE
Th4
Th5
Th1
Th3
S3a
S3b
R1a
S1a
S2a
(INCLUDES
OVER-
CURRENT
PROTECTION)
SLIC
Th2
R
WIRE
TISP
3xxxF3
OR
R1b
TISP
PBLx
S1b
S2b
VBat
C2
7xxxF3
VB
C1
D1
TEST
EQUIP-
MENT
RING
GENERATOR
AI6XAPEA
Figure 18 TYPICAL APPLICATION CIRCUIT
Relay contacts 3a and 3b connect the line conductors to the SLIC via the TISPPBLx protector. Closing
contacts 3a and 3b connects the TISPPBLx protector in parallel with the ring/test protector. As the ring/test
protector requires much higher voltages than the TISPPBLx 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 required
current ratings should be similar. The TISPPBLx protector gate reference voltage comes from the SLIC
negative supply feed (VB). A local gate capacitor, C1, sources the gate current pulses caused by fast rising
impulses.
P R O D U C T
I N F O R M A T I O N
14
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