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SMP100LC Arkusz danych(PDF) 5 Page - STMicroelectronics |
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SMP100LC Arkusz danych(HTML) 5 Page - STMicroelectronics |
5 / 12 page SMP100LC Application information 5/12 2 Application information In wireline 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 9. 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 circuit opening. Lightning surge and mains disturbance surges are defined by standards like GR1089, FCC part 68, ITU-T K20. Figure 10. Typical circuits Figure 7. Variation of thermal impedance junction to ambient versus pulse duration (PCB - FR4, SCu = 35µm, recommended pad layout) Figure 8. Relative variation of junction capacitance versus reverse voltage applied (typical values) 1E-3 1E-2 1E-1 1E+0 1E+1 1E+2 5E+2 1 10 100 t (s) p Z/R th(j-a) th(j-a) C [V ] / C [V =2V] RR 12 5 10 20 50 100 300 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 V (V) R F =1MHz V = 1V T = 25°C j RMS Line Ring relay Line Ex. Analog line card Ex. xDSL line card or terminal Fuse TCP 1.25A T1 T2 SMP100LC-xxx Typical circuit for subscriber side Fuse TCP 1.25A Tip S Gnd SMP100LC-xxx Ring S SMP100LC-xxx Fuse TCP 1.25A Tip L Gnd Ring L Typical circuit for central office side |
Podobny numer części - SMP100LC |
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Podobny opis - SMP100LC |
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