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TISP4290H3 Datasheet(PDF) 10 Page - Bourns Electronic Solutions |
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TISP4290H3 Datasheet(HTML) 10 Page - Bourns Electronic Solutions |
10 / 13 page TISP4xxxH3LM Overvoltage Protector Series Deployment NOVEMBER 1997 - REVISED JANUARY 2010 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications. APPLICATIONS INFORMATION These devices are two terminal overvoltage protectors. They may be used either singly to limit the voltage between two conductors (Figure 12) or in multiples to limit the voltage at several points in a circuit (Figure 13). Figure 12. Two Point Protection Figure 13. Multi-point Protection Th1 Th3 Th2 Th1 In Figure 12, 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 13, protectors Th2 and Th3 limit the maximum voltage between each conductor 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. 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 . 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. In some cases, the equipment will require verification over a temperature range. By using the rated waveform values from Figure 11, the appropriate series resistor value can be calculated for ambient temperatures in the range of -40 °C to 85 °C. Standard Peak Voltage Setting V Voltage Waveform µs Peak Current Value A Current Waveform µs TISP4xxxH3 25 °C Rating A Series Resistance Ω GR-1089-CORE 2500 2/10 500 2/10 500 0 1000 10/1000 100 10/1000 100 FCC Part 68 (March 1998) 1500 10/160 200 10/160 250 0 800 10/560 100 10/560 160 0 1500 9/720 † 37.5 5/320 † 200 0 1000 9/720 † 25 5/320 † 200 0 I3124 1500 0.5/700 37.5 0.2/310 200 0 ITU-T K.20/K 21 1500 4000 10/700 37.5 100 5/310 200 0 † FCC Part 68 terminology for the waveforms produced by the ITU-T recommendation K.21 10/700 impulse generator AC Power Testing The protector can withstand currents applied for times not exceeding those shown in Figure 8. Currents that exceed these times must be terminated or reduced to avoid protector failure. Fuses, PTC (Positive Temperature Coefficient) resistors and fusible resistors are overcurrent protection devices which can be used to reduce the current flow. Protective fuses may range from a few hundred milliamperes to one am- pere. In some cases, it may be necessary to add some extra series resistance to prevent the fuse opening during impulse testing. The current versus time characteristic of the overcurrent protector must be below the line shown in Figure 8. In some cases, there may be a further time limit imposed by the test standard (e.g. UL 1459 wiring simulator failure). OBSOLET E |
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