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SMP100MC-270 Scheda tecnica(PDF) 6 Page - STMicroelectronics |
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SMP100MC-270 Scheda tecnica(HTML) 6 Page - STMicroelectronics |
6 / 13 page Application information SMP100MC 6/13 Doc ID 9699 Rev 5 2 Application information In wire line applications, analog or digital, both central office and subscriber sides have to be protected. This function is assumed by a combined series / parallel protection stage Figure 10. Examples of protection stages for line cards In such a stage, parallel function is assumed by one or several Trisil, and is used to protect against short duration surge (lightning). During this kind of surges the Trisil limits the voltage across the device to be protected at its break over value and then fires. The fuse assumes the series function, and is used to protect the module against long duration or very high current mains disturbances (50/60Hz). It acts by safe circuits opening. Lightning surge and mains disturbance surges are defined by standards like GR1089, TIA/EIA IS-968, ITU-T K20. Figure 8. Variation of thermal impedance junction to ambient versus pulse duration Figure 9. Relative variation of junction capacitance versus reverse voltage applied (typical values) Z/R th(j-a) th(j-a) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03 tp(s) Printed circuit board - FR4, copper thickness = 35µm, recommended pad layout 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1 10 100 1000 V (V) R C [V ] / C [V =2V] RR F =1MHz V = 1V Tj = 25°C OSC RMS Line Ring relay Line Ex. Analog line card Ex. ADSL line card or terminal |
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