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TISP4082F3 Datasheet(PDF) 8 Page - Power Innovations Ltd |
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TISP4082F3 Datasheet(HTML) 8 Page - Power Innovations Ltd |
8 / 12 page TISP4072F3, TISP4082F3 SYMMETRICAL TRANSIENT VOLTAGE SUPPRESSORS 8 MARCH 1994 - REVISED SEPTEMBER 1997 PRODUCT 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 7.) . 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 13 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. Figure 13. APPLICATIONS INFORMATION NORMALISED CAPACITANCE V d - RMS AC Test Voltage - mV 1 10 100 1000 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 AIXXAA Normalised to V d = 100 mV DC Bias, V D = 0 RMS AC TEST VOLTAGE vs |
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