151DHV Просмотр технического описания (PDF) - STMicroelectronics
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151DHV Datasheet PDF : 9 Pages
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LCP1521
The series resitors Rs1 and Rs2 designed in figure A1 represent the fuse resistors or the PTC which are man-
datory to withstand the power contact or the power induction tests 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 30Ω of series resistors which has to be qualified under GR1089 Core 1000V
10/1000µs surge, the actual current through the LCP1521 is equal to:
I surge = 1000 / (10 + 30) = 25A
The LCP1521 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 A3 gives the most fre-
quent topology used for these applications.
Fig. A3: Protection of high voltage SLIC.
Rs (*)
Line
GND
Gate
220nF
Rs (*)
TIP
GND
RING
GND
LCP1521
Line card
Rs (*) = PTC or Resitor fuse
-Vbat
TIP
SLIC
RING
7/9
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