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AN574 Datasheet(PDF) 3 Page - STMicroelectronics |
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AN574 Datasheet(HTML) 3 Page - STMicroelectronics |
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3 / 4 page  2.4. Power dissipation The dissipated power in both the Transil and the Trisil is due to the presence of voltage across and current through the protection device. Note that for the same package, the current-handling capability of a Transil depends on the breakdown voltage, whereas this is not the case for a Trisil. For example, with the CB429 package we have the Transil series 1.5 KE and the Trisil family TPB which have different behaviour in terms of current suppression. As shown in table 1 the current rating of TPB devices is always 100 A whatever the VBR value, while it depends on the VBR for the 1.5KE series. Current capability for 1ms wave 10V 62V 150V 220V Transil 1.5KE 103A 17.7A 7.2A 4.6A Trisil TPB 100A 100A 100A Table 1 : Current capabilities of Transil 1.5KE and Trisil TPB Tables 2 and 3 summarize the different behaviour and advantages of both Transil and Trisil devices. It is not possible to say "Transils are better than Trisils" or the opposite, only that their application areas are different. SGS-THOMSON produces both types of devices meeting the widest protection requirements range. 3. SUMMARY TRANSIL TRISIL TYPE OF ACTION CLAMPING CROWBAR ELECTRICAL CHARACTERISTICS SCHEMATICS ELECTRICAL BEHAVIOUR ACTION START Vsurge > VBR Vsurge > VBO ACTION STOP Vsurge < VBR I < Holding Current Table 2 : Transil/Trisil Summary I V -V BR V BR OR V CL I V -V BO V BO GATE OR V BO TRANSIL TRISIL No short - circuit across low - impedance lines , eg - power - supply. Greater power handling due to lower voltage across terminals. No need to ensure device switch - off after transient subsides. Available with program- mable breakover voltage. Table 3 : Transil/Trisil distinctive advantages ® APPLICATION NOTE 3/4 |
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