Datasheet

LCP02-150B1 Technical information
Doc ID 7275 Rev 8 7/10
The series resistors Rs1 and Rs2 designed in Figure 7 represent the fuse resistors or the
PTCs which are needed to withstand the power contact or the power induction tests
imposed by the country standards. Taking this factor into account, the actual lightning surge
current flowing through the LCP02-150B1 is equal to:
I surge = Vsurge / (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)
For a line card with 50 Ω of series resistors which has to be qualified under GR-1089 1000 V
10/1000 µs surge, the present current through the LCP02-150B1 is equal to:
I surge = 1000 / (10 + 50) = 17 A
The LCP02-150B1 topology is particularly optimized for the new telecom applications such
as fiber in the loop, WLL systems, decentralized central office for example.
Figure 8. Protection of SLIC with positive and negative battery voltages
Figure 8 shows the classical protection topology for SLIC using both positive and negative
battery voltages. With such a protection the SLIC is protected against surge over +Vb and
lower than -Vbat. In this case, +Vb can be programmed up to +120 V while -Vbat can be
programmed down to -120 V.
Gn
Gp
GND
TIP
RING
-Vbat
+Vb
LCP02
220nF
SLIC
Rs (*)
Rs (*)
Line
Line card
TIP
RING
220nF
Rs (*) = PTC or Resistor fuse
Obsolete Product(s) - Obsolete Product(s)