AN2053

LCP concept

Doc ID 10917 Rev 2

5/15

Figure 6.

Example of PCB layout based on LCP15xx protection

The series resistors Rs1 an Rs2 designed in Figure 5 represent the fuse resistors or the

PTC which are mandatory to withstand the power contact or the power induction tests

imposed by the different country standards. Taking into account this fact, the actual lightning

surge current flowing through the LCP is equal to:

With:

●

●

●

For a line card with 30

Ω of series resistors which has to be qualified under GR-1089 Core

1000 V, 10/1000 µs surge, the actual current through the LCP1521S is:

To

line side

GND

To

SLIC side