CLP200M datasheet(3/21 Pages) STMICROELECTRONICS

3 / 21 page

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CLP200M

3/21

"PRIMARY PROTECTION"

"SECONDARY PROTECTION"

MDF

LINE CARD

telecommunication

EXCHANGE

line

"SECONDARY PROTECTION"

MDF

LINE CARD

telecommunication

EXCHANGE

line

CLP200M

SLIC

THDTxx or

LPC1511D

or LB200B

SLIC

CLP200M

Fig. 1 : Subscriber line protection topology

-I

SWON

Programmable thanks to

an external resistor

Programmable thanks to

any external voltage reference

Line card operating conditions

SWON

Fig. 2 : Line card protection

APPLICATION NOTE

1. INTRODUCTION

The aim of this section is to show the behavior of

our new telecom line protection device. This de-

vice includes a primary protection level and is suit-

able

for

main

distribution

frames

and

line

cardsThis protection concept is explained and, in

addition, the CLP200M performances are ana-

lysed when facing different surges as described in

the CCITT recommendations.

Figure 1 is a simplified block diagram of a sub-

scriber line protection that is mainly used so far.

This shows two different things :

A “primary protection” located on the Main Distri-

bution Frame (MDF) eliminates coarsely the

high energy environmental disturbances (light-

ning

transients

and

power

mains

disturbances)

A “secondary protection” located on the line card

includes a primary protection level (first stage) and

a residual protection (second stage) which elimi-

nates finely the remaining transients that have not

been totally suppressed by the first stage.

The CLP200M can be used both in MDFs and in

line cards. In that case, any line card may be

swapped from one MDF to another one without re-

ducing the efficiency of the whole system protec-

tion.

The CCITT requirements are different for these

two protection locations (MDFs and line cards).

Concerning the “primary protection”, the CCITT re-

quires a 4kV, 10/700

µs surge test whereas the

“secondary protection” has to withstand a 1kV,

10/700

µs surge test.

The explanations which follow are basically

covering the line card application.

2. STMicroelectronics CLP200M CONCEPT

2.1 Evolution of the SLIC protection

Over the years, the silicon protection perfor-

mances have considerably changed.

The first generation of products like SMTHBTxx

and SMTHDTxx offered fixed overvoltage protec-

tion against surges on either TIP or RING line in

four packages.

The following generation like THBTxx and

THDTxx still offered fixed overvoltage protection

against surges on both TIP and RING lines in two

packages.

The next step was the introduction of the

LCP1511D which brought the advantage of full

programmable voltage.

Today, the CLP200M combines the features of all

the previous generations. In addition to that, it of-

fers an overcurrent detection when operating in

speech mode and also a Failure Status output sig-

nal.

The figure 2 summarizes the performance of the

CLP200M which basically holds the SLIC inside its

correct voltage and current values.

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