TISPPBL2SD
PROGRAMMABLE OVERVOLTAGE PROTECTORS
FOR ERICSSON COMPONENTS PBL 3xxx SLICS
AUGUST 1999
PBL 3xxx SLIC VOLTAGE WITHSTAND
AND TISPPBL2S VOLTAGE LIMITING
40
30
20
10
0
vs
TIME
PBL 386 20/1
PBL 3762A
PBL 3796
TISPPBL2S
10 ms
Time
1 ms
10 µs
1 µs
0.25 µs
VBATM
VBATM - 10
VBATM - 20
VBATM - 30
TISPPBL2S
PBL 386 20/1
V
BATM - 40
BATM - 50
PBL 3796
V
VBATM - 60
VBATM - 70
PBL 3762A
AI6XBDS
Figure 16. SLIC VOLTAGE WITHSTAND AND TISPPBL2S PROTECTION LEVELS
OVER-
CURRENT
PROTECTION
SLIC
PROTECTION
RING/TEST
PROTECTION
TEST
RELAY
RING
RELAY
SLIC
RELAY
TIP
WIRE
RP
Th1
S3a
R1a
Th4
S1a
S2a
PBL
3xxx
SLIC
Th3
Th5
R1b
Th2
RING
WIRE
RP
TISP
S3b
TISP
3xxxF3
OR
PBL2S
S1b
S2b
VBAT
C1
220 nF
7xxxF3
RP IS USED WHEN THE SLIC
HAS TERTIARY PROTECTION
TEST
EQUIP-
MENT
RING
GENERATOR
AI6XAPS
Figure 17. TYPICAL APPLICATION CIRCUIT
required current ratings should be similar. The TISPPBL2S protector gate reference voltage comes from the
SLIC negative supply (VBAT). A 220 nF gate capacitor sources the high gate current pulses caused by fast
rising impulses. When the SLIC has internal tertiary protection (e.g. PBL 386 21/1), then the two RP resistors
need to be added for protection co-ordination.
P R O D U C T
I N F O R M A T I O N
13
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