LCP02-150B1

7/8

Gn

Gp

GND

TIP

RING

-Vbat

+Vb

LCP02

220nF

SLIC

Rs (*)

Rs (*)

Line

Line card

TIP

RING

220nF

Rs (*) = PTC or Resistor fuse

Fig. 6: Protection of SLIC with positive and negative battery voltages.

Gn

Gp

GND

TIP

RING

-Vbat

LCP02

220nF

SLIC

Rs (*)

Rs (*)

Line

Line card

TIP

RING

Rs (*) = PTC or Resistor fuse

Fig. 7: Protection of high voltage SLIC

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

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

Figure 7 gives the protection topology for the new SLIC using high negative voltage down to -110V.