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LCP152DEERL Datasheet(PDF) 7 Page - STMicroelectronics |
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LCP152DEERL Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 11 page LCP1521S/LCP152DEE Technical information 7/11 imposed by the various country standards. Taking into account this fact the actual lightning surge current flowing through the LCP is equal to: I surge = V surge / (Rg + Rs) With: V surge = peak surge voltage imposed by the standard. Rg = series resistor of the surge generator Rs = series resistor of the line card (e.g. PTC) e.g. For a line card with 30 Ω of series resistors which has to be qualified under GR1089 Core 1000V 10/1000 µs surge, the actual current through the LCP152 is equal to: I surge = 1000 / (10 + 30) = 25 A The LCP152 is particularly optimized for the new telecom applications such as the fiber in the loop, the WLL, the remote central office. In this case, the operating voltages are smaller than in the classical system. This makes the high voltage SLICs particularly suitable. The schematics of Figure 7. give the most frequent topology used for these applications. Figure 7. Protection of high voltage SLIC Rs (*) = PTC or fuse resistor Gate GND GND TIP RING -Vbat LCP152xx 220nF SLIC Rs (*) Rs (*) Line Line card TIP RING GND Figure 8. Surge peak current versus overload duration Figure 9. Relative variation of holding current versus junction temperature I (A) TSM 0 4 8 12 16 20 24 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03 t(s) F=50Hz Tj initial=25°C -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 0.7 0.8 0.9 1 1.1 1.2 1.3 T (°C) j I [T ] / I [T =25°C] Hj Hj |
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