TISP7072F3D POINN [Power Innovations Ltd], TISP7072F3D Datasheet - Page 15

• Manufacturer Part Number: TISP7072F3D
• Description: TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS??
• Manufacturer: POINN [Power Innovations Ltd]

protection voltage
capacitance
off-state capacitance
P R O D U C T
GR-1089-CORE
FCC Part 68
(March 1998)
I 31-24
ITU-T K20/K21
† FCC Part 68 terminology for the waveforms produced by the ITU-T recommendation K21 10/700 impulse generator
NA = Not Applicable, primary protection removed or not specified.
STANDARD
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 derated waveform values
from the thermal information section, the appropriate series resistor value can be calculated for ambient
temperatures in the range of 0 °C to 70 °C.
The protection voltage, (V
increase is dependent on the rate of current rise, di/dt, when the TISP
breakdown region. The V
V
from the surge generator voltage rate of rise, dv/dt, and the circuit resistance.
As an example, the ITU-T recommendation K.21 1.5 kV, 10/700 surge has an average dv/dt of 150 V/µs, but,
as the rise is exponential, the initial dv/dt is three times higher, being 450 V/µs. The instantaneous generator
output resistance is 25
resistance becomes 45
measured di/dt and protection voltage increase will be lower due to inductive effects and the finite slope
resistance of the TISP
The off-state capacitance of a TISP
comprising of the dc voltage, V
measured with an ac voltage of 1 V rms. When V
of V
capacitance is strongly dependent on connection inductance. For example, a printed wiring (PW) trace of
10 cm could create a circuit resonance with the device capacitance in the region of 80 MHz.
If the impulse generator current exceeds the protectors current rating then a series resistance can be used to
(BO)
d
. Up to 10 MHz the capacitance is essentially independent of frequency. Above 10 MHz the effective
(250 V/ms) value by the normalised increase at the surge’s di/dt. An estimate of the di/dt can be made
PEAK VOLTAGE
SETTING
2500
1000
1500
1000
1500
1500
1500
1000
1500
4000
4000
800
V
I N F O R M A T I O N
®
breakdown region.
TRIPLE BIDIRECTIONAL THYRISTOR OVERVOLTAGE PROTECTORS
WAVE FORM
(BO)
(BO)
. The maximum di/dt then can be estimated as 450/45 = 10 A/µs. In practice the
. If the equipment has an additional series resistance of 20
VOLTAGE
(SINGLE)
(SINGLE)
(SINGLE)
10/1000
9/720 †
(DUAL)
0.5/700
(DUAL)
10/160
10/560
10/700
2/10
), increases under lightning surge conditions due to thyristor regeneration. This
µs
value under surge conditions can be estimated by multiplying the 50 Hz rate
D
, and the ac voltage, V
PEAK CURRENT
®
is sensitive to junction temperature, T
2 x 500
2 x 100
VALUE
2 x 27
2 x 72
37.5
37.5
37.5
200
100
100
25
25
A
D
>> V
WAVE FORM
CURRENT
10/1000
d
d
5/320 †
5/320 †
0.2/310
10/160
10/560
4/250
5/310
5/310
5/310
4/250
. All the capacitance values in this data sheet are
2/10
the capacitance value is independent on the value
µs
25 °C RATING
TISP7xxxF3
2 x 85
2 x 40
2 x 60
2 x 60
65
45
50
50
50
50
50
50
A
®
MARCH 1994 - REVISED MARCH 2000
is clamping the voltage in its
TISP7072F3, TISP7082F3
RESISTANCE
J
SERIES
, and the bias voltage,
25
16
10
40
12
0
0
0
0
, the total series
COORDINATION
RESISTANCE
(MIN.)
NA
NA
NA
NA
NA
8
7
15