4070M3 データシートの表示（PDF） - Power Innovations
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4070M3 Datasheet PDF : 14 Pages
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TISP4070M3BJ THRU TISP4095M3BJ, TISP4125M3BJ THRU TISP4200M3BJ,
TISP4240M3BJ THRU TISP4400M3BJ
BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
NOVEMBER 1997 - REVISED MARCH 1999
deployment
APPLICATIONS INFORMATION
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).
Th3
Th1
Th1
Th2
Figure 12. TWO POINT PROTECTION
Figure 13. MULTI-POINT PROTECTION
In Figure 12, protector Th1 limits the maximum voltage between the two conductors to ±V(BO). This
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(BO) of the
individual protector. Protector Th1 limits the maximum voltage between the two conductors to its ±V(BO)
value. If the equipment being protected has all its vulnerable components connected between the conductors
and ground, then protector Th1 is not required.
impulse testing
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.
PEAK VOLTAGE VOLTAGE PEAK CURRENT CURRENT TISP4xxxM3
SERIES
STANDARD
SETTING WAVE FORM
VALUE
WAVE FORM 25 °C RATING RESISTANCE
V
µs
A
µs
A
Ω
2500
2/10
500
2/10
300
GR-1089-CORE
11
1000
10/1000
100
10/1000
50
1500
10/160
200
10/160
120
2x5.6
FCC Part 68
800
10/560
100
10/560
75
3
(March 1998)
1500
9/720 †
37.5
5/320 †
100
0
1000
9/720 †
25
5/320 †
100
0
I3124
1500
0.5/700
37.5
0.2/310
100
0
1500
37.5
ITU-T K20/K21
10/700
5/310
100
0
4000
100
† FCC Part 68 terminology for the waveforms produced by the ITU-T recommendation K21 10/700 impulse generator
If the impulse generator current exceeds the protectors current rating then a series resistance can be used to
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.
For the FCC Part 68 10/560 waveform the following values result. The minimum total circuit impedance is
800/75 = 10.7 Ω and the generators fictive impedance is 800/100 = 8 Ω. This gives a minimum series
resistance value of 10.7 - 8 = 2.7 Ω. After allowing for tolerance, a 3 Ω ±10% resistor would be suitable. The
10/160 waveform needs a standard resistor value of 5.6 Ω per conductor. These would be R1a and R1b in
PRODUCT INFORMATION
8
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