TISP4095H3BJ POINN [Power Innovations Ltd], TISP4095H3BJ Datasheet - Page 8

• Manufacturer Part Number: TISP4095H3BJ
• Description: BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
• Manufacturer: POINN [Power Innovations Ltd]

TISP4070H3BJ THRU TISP4095H3BJ, TISP4125H3BJ THRU TISP4200H3BJ,
TISP4240H3BJ THRU TISP4400H3BJ
BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
NOVEMBER 1997 - REVISED MARCH 1999
deployment
impulse testing
P R O D U C T
8
These devices are two terminal overvoltage protectors. They may be used either singly to limit the voltage
between two conductors (Figure 12) or in multiples to limit the voltage at several points in a circuit (Figure 13).
In Figure 12, protector Th1 limits the maximum voltage between the two conductors to ±V
configuration is normally used to protect circuits without a ground reference, such as modems. In Figure 13,
protectors Th2 and Th3 limit the maximum voltage between each conductor and ground to the ±V
individual protector. Protector Th1 limits the maximum voltage between the two conductors to its ±V
value. If the equipment being protected has all its vulnerable components connected between the conductors
and ground, then protector Th1 is not required.
To verify the withstand capability and safety of the equipment, standards require that the equipment is tested
with various impulse wave forms. The table below shows some common values.
reduce the current to the protectors rated value and so prevent possible failure. The required value of series
resistance for a given waveform is given by the following calculations. First, the minimum total circuit
impedance is found by dividing the impulse generators peak voltage by the protectors rated current. The
impulse generators fictive impedance (generators peak voltage divided by peak short circuit current) is then
subtracted from the minimum total circuit impedance to give the required value of series resistance. In some
cases the equipment will require verification over a temperature range. By using the rated waveform values
from Figure 11, the appropriate series resistor value can be calculated for ambient temperatures in the range
of -40 °C to 85 °C.
If the impulse generator current exceeds the protectors current rating then a series resistance can be used to
Figure 12. TWO POINT PROTECTION
GR-1089-CORE
FCC Part 68
(March 1998)
I3124
ITU-T K20/K21
† FCC Part 68 terminology for the waveforms produced by the ITU-T recommendation K21 10/700 impulse generator
STANDARD
I N F O R M A T I O N
PEAK VOLTAGE
SETTING
Th1
2500
1000
1500
1500
1000
1500
1500
4000
800
V
APPLICATIONS INFORMATION
WAVE FORM
VOLTAGE
10/1000
9/720 †
9/720 †
0.5/700
10/160
10/560
10/700
2/10
µs
PEAK CURRENT
VALUE
37.5
37.5
37.5
500
100
200
100
100
25
A
Figure 13. MULTI-POINT PROTECTION
WAVE FORM
CURRENT
10/1000
5/320 †
5/320 †
0.2/310
10/160
10/560
5/310
2/10
µs
Th1
25 °C RATING
TISP4xxxH3
500
100
250
160
200
200
200
200
A
Th3
Th2
RESISTANCE
SERIES
0
0
0
0
0
0
0
(BO)
(BO)
. This
of the
(BO)