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TISP7072F3 Datasheet(PDF) 10 Page - Bourns Electronic Solutions

Part # TISP7072F3
Description  LOW-VOLTAGE TRIPLE ELEMENT BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
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Manufacturer  BOURNS [Bourns Electronic Solutions]
Direct Link  http://www.bourns.com
Logo BOURNS - Bourns Electronic Solutions

TISP7072F3 Datasheet(HTML) 10 Page - Bourns Electronic Solutions

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MARCH 1994 - REVISED SEPTEMBER 2008
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
Deployment
Wave Shape Notation
Generators
ITU-T 10/700 Generator
APPLICATIONS INFORMATION
TISP70xxF3 (LV) Overvoltage Protector Series
These devices are three terminal overvoltage protectors. They limit the voltage between three points in the circuit. Typically, this would be the
two line conductors and protective ground (Figure 16).
In Figure 16, protective functions Th2 and Th3 limit the maximum voltage between each conductor and ground to their respective ±V(BO)
values. Protective function Th1 limits the maximum voltage between the two conductors to its ±V(BO) value.
Lightning Surge
Most lightning tests, used for equipment verification, specify a unidirectional sawtooth waveform which has an exponential rise and an
exponential decay. Wave shapes are classified in terms of rise time in microseconds and a decay time in microseconds to 50 % of the maximum
amplitude. The notation used for the wave shape is
rise time/decay time, without the microseconds quantity and the “/” between the two values
has no mathematical significance. A 50 A, 5/310 waveform would have a peak current value of 50 A, a rise time of 5 µs and a decay time of 310
µs. The TISP® surge current graph comprehends the wave shapes of commonly used surges.
There are three categories of surge generator type: single wave shape, combination wave shape and circuit defined. Single wave shape
generators have essentially the same wave shape for the open circuit voltage and short circuit current (e.g., 10/1000 open circuit voltage and
short circuit current). Combination generators have two wave shapes, one for the open circuit voltage and the other for the short circuit current
(e.g., 1.2/50 open circuit voltage and 8/20 short circuit current). Circuit specified generators usually equate to a combination generator,
although typically only the open circuit voltage wave shape is referenced (e.g., a 10/700 open circuit voltage generator typically produces a 5/
310 short circuit current). If the combination or circuit defined generators operate into a finite resistance, the wave shape produced is
intermediate between the open circuit and short circuit values.
This circuit defined generator is specified in many standards. The descriptions and values are not consistent between standards and it is
important to realize that it is always the same generator being used.
Figure 17 shows the 10/700 generator circuit defined in ITU-T recommendation K.20 (10/96) “Resistibility of telecommunication switching
equipment to overvoltages and overcurrents”. The basic generator comprises of:
Capacitor C1, charged to voltage VC, which is the energy storage element.
Switch SW to discharge the capacitor into the output shaping network.
Shunt resistor R1, series resistor R2 and shunt capacitor C2 form the output shaping network.
Series feed resistor R3 to connect to one line conductor for single surge.
Series feed resistor R4 to connect to the other line conductor for dual surging.
In the normal single surge equipment test configuration, the unsurged line is grounded. This is shown by the dotted lines in the top drawing of
Figure 17. However, doing this at device test places one terminal pair in parallel with another terminal pair. To check the individual terminal pairs
of the TISP7xxxF3, without any paralleled operation, the unsurged terminal is left unconnected.
With the generator output open circuit, when SW closes, C1 discharges through R1. The decay time constant will be C1 R1, or
20 x 50 = 1000 µs. For the 50 % voltage decay time, the time constant needs to be multiplied by 0.697, giving 0.697 x 1000 = 697 µs which is
rounded to 700 µs.
Figure 16. MULTI-POINT PROTECTION
Th3
Th2
Th1


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