TISP1072F3P 查看數據表（PDF） - Power Innovations Ltd

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TISP1072F3P

DUAL ASYMMETRICAL TRANSIENT VOLTAGE SUPPRESSORS

Power Innovations Ltd 

TISP1072F3, TISP1082F3

DUAL ASYMMETRICAL TRANSIENT

VOLTAGE SUPPRESSORS

SEPTEMBER 1993 - REVISED SEPTEMBER 1997

APPLICATIONS INFORMATION

protection voltage

The protection voltage, (V(BO) ), increases under lightning surge conditions due to thyristor regeneration.

This increase is dependent on the rate of current rise, di/dt, when the TISP is clamping the voltage in its

breakdown region. The V(BO) value under surge conditions can be estimated by multiplying the 50 Hz rate

V(BO) (250 V/ms) value by the normalised increase at the surge’s di/dt (Figure 8.) . An estimate of the di/dt

can be made from the surge generator voltage rate of rise, dv/dt, and the circuit resistance.

As an example, the CCITT IX K17 1.5 kV, 10/700 µs surge has an average dv/dt of 150 V/µs, but, as the rise

is exponential, the initial dv/dt is higher, being in the region of 450 V/µs. The instantaneous generator output

resistance is 25 Ω. If the equipment has an additional series resistance of 20 Ω, the total series resistance

becomes 45 Ω. The maximum di/dt then can be estimated as 450/45 = 10 A/µs. In practice the

measured di/dt and protection voltage increase will be lower due to inductive effects and the finite slope

resistance of the TISP breakdown region.

capacitance

off-state capacitance

The off-state capacitance of a TISP is sensitive to junction temperature, TJ , and the bias voltage, comprising

of the dc voltage, VD , and the ac voltage, Vd . All the capacitance values in this data sheet are measured

with an ac voltage of 100 mV. The typical 25°C variation of capacitance value with ac bias is shown in Figure

21. When VD >> Vd the capacitance value is independent on the value of Vd . The capacitance is essentially

constant over the range of normal telecommunication frequencies.

NORMALISED CAPACITANCE

vs

RMS AC TEST VOLTAGE

AIXXAA

1.05

1.00

0.95

0.90

0.85

0.80

0.75

Normalised to Vd = 100 mV

DC Bias, VD = 0

0.70

1

10

100

Vd - RMS AC Test Voltage - mV

Figure 21.

1000

PRODUCT INFORMATION

11

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