LCP02-150B1
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. The schematics of figures 6 and 7 give the 2
most frequent topologies used for these emergent applications
Fig. 6: Protection of SLIC with positive and negative battery voltages.
Line
Line card
-Vbat
Rs (*)
Gn
TIP
GND
220nF
LCP02 Gp
Rs (*)
RING
220nF
TIP
SLIC
RING
Rs (*) = PTC or Resistor fuse
Fig. 7: Protection of high voltage SLIC
Line card
Rs (*)
Line
Gn
TIP
GND
220nF
LCP02 Gp
Rs (*)
RING
+Vb
-Vbat
TIP
SLIC
RING
Rs (*) = PTC or Resistor fuse
Figure 6 shows the classical protection topology for SLIC using both positive and negative battery volt-
ages. 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 +95V while -Vbat can be programmed down to -110V. Please note
that the differential voltage does not exceed ∆Vbat max at 190V.
Figure 7 gives the protection topology for the new SLIC using high negative voltage down to -110V.
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