CLP200M datasheet(3/21 Pages) STMICROELECTRONICS

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Fig. 1 : Subscriber line protection topology

”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. 2 : Line card protection

-I

SWON

Programmable thanks to

an external resistor

Programmable thanks to

any external voltage reference

Line card operating conditions

SWON

APPLICATION NOTE

1. INTRODUCTION

The aim of this section is to show the behavior of

our new telecom line protection device. This device

includes a primary protection level and is suitable

for main distribution frames and line cards. This

protection concept is explained and, in addition,

the CLP200M performances are analysed 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 (lightning

transients and AC power mains disturbances)

A ”secondary protection” located on the line card

includes a primary protectionlevel (first stage)and

a residual protection (second stage) which elimi-

nates finely the remaining transients that have not

beentotally 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 ba sically

covering thelinecardapplication.

2. SGS-THOMSON CLP200M CONCEPT

2.1 Evolution of the SLIC protection

Over the years, the silicon protection per-

formances have consider ably 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 gene ration like THBTxx and

THDTxx still offered fixed overvoltage protection

against surges on both TIP and RING lines in two

package s.

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.

CLP200M

3/21

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