LCP1521S/LCP152DEE

Technical information

7/11

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

surge current flowing through the LCP is equal to:

With:

e.g. For a line card with 30

Ω of series resistors which has to be qualified under GR1089

Core 1000V 10/1000 µs surge, the actual current through the LCP152 is equal to:

The LCP152 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 7. give the most frequent topology used for these applications.

Figure 7.

Protection of high voltage SLIC

Rs (*) = PTC or fuse resistor

Gate

GND

GND

TIP

RING

-Vbat

LCP152xx

220nF

SLIC

Rs (*)

Rs (*)

Line

Line card

TIP

RING

GND

Figure 8.

Surge peak current versus overload

duration

Figure 9.

Relative variation of holding

current versus junction

temperature

I

(A)

TSM

0

4

8

12

16

20

24

1.E-02

1.E-01

1.E+00

1.E+01

1.E+02

1.E+03

t(s)

F=50Hz

-40

-30

-20

-10

0

10

20

30

40

50

60

70

80

90

0.7

0.8

0.9

1

1.1

1.2

1.3

T (°C)

j

I [T ] / I [T =25°C]

Hj

Hj