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TISP4220M3BJR Datasheet(PDF) 10 Page - Bourns Electronic Solutions

Part # TISP4220M3BJR
Description  BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
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Manufacturer  BOURNS [Bourns Electronic Solutions]
Direct Link  http://www.bourns.com
Logo BOURNS - Bourns Electronic Solutions

TISP4220M3BJR Datasheet(HTML) 10 Page - Bourns Electronic Solutions

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NOVEMBER 1997 - REVISED FEBRUARY 2005
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
TISP4xxxM3BJ Overvoltage Protector Series
These devices are two terminal overvoltage protectors. They may be used either singly to limit the voltage between two conductors (Figure 13)
or in multiples to limit the voltage at several points in a circuit (Figure 14).
APPLICATIONS INFORMATION
Deployment
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.
Figure 13. Two Point Protection
Th1
Figure 14. Multi-Point Protection
Th3
Th2
Th1
In Figure 13, 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 14, protectors Th2 and Th3 limit the maximum voltage between each conduc-
tor 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.
Standard
Peak Voltage
Setting
V
Voltage
Wave Shape
µs
Peak Current
Value
A
Current
Wave Shape
µs
TISP4XXXM3
25 °C Rating
A
Series
Resistance
GR-1089-CORE
2500
2/10
500
2/10
300
11
1000
10/1000
100
10/1000
50
FCC Part 68
(March 1998)
1500
10/160
200
10/160
120
2x5.6
800
10/560
100
10/560
75
3
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
ITU-T K.20/K.21
1500
4000
10/700
37.5
100
5/310
100
0
† FCC Part 68 terminology for the waveforms produced by the ITU-T recommendation K.21 10/700 impulse generator
If the impulse generator current exceeds the protector’s current rating, then a series resistance can be used to reduce the current to the
protector’s rated value to 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 generator’s peak voltage by the protector’s rated
current. The impulse generator’s fictive impedance (generator’s 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 generator’s
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
Figure 16 and Figure 17. FCC Part 68 allows the equipment to be non-operational after the 10/160 (conductor to ground) and 10/560 (inter-
conductor) impulses. The series resistor value may be reduced to zero to pass FCC Part 68 in a non-operational mode, e.g. Figure 15. For this
type of design, the series fuse must open before the TISP4xxxM3 fails. For Figure 15, the maximum fuse i2t is 2.3 A2s. In some cases, the
equipment will require verification over a temperature range. By using the rated waveform values from Figure 12, the appropriate series resistor
value can be calculated for ambient temperatures in the range of -40 °C to 85 °C.


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