CLP270M-TR 查看數據表（PDF） - STMicroelectronics
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CLP270M-TR Datasheet PDF : 24 Pages
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CLP270M
APPLICATION NOTE
1. INTRODUCTION
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 CLP270M performances are analysed when
Fig. 1: Subscriber line protection topology
Telecommunication
line
“PRIMARY PROTECTION”
CLP270M
MDF
“SECONDARY PROTECTION”
SLIC
LINE CARD
EXCHANGE
Telecommunication
line
MDF
“SECONDARY PROTECTION”
CLP270M
THDTxx
or
LCP1511D
or
LCDP1511D
SLIC
LINE CARD
EXCHANGE
facing different surges as described in the BELLCORE GR 1089 recommendations.
Figure 1 is a simplified block diagram of a subscriber line protection that is commonly used.
This shows two different topologies :
s A “primary protection” located on the Main Distribution Frame (MDF) eliminates coarsely the high energy
environmental disturbances (lightning transients and AC power mains disturbances)
s A “secondary protection” located on the line card includes a primary protection level (first stage) and a
residual protection (second stage) which eliminates finely the remaining transients that have not been totally
suppressed by the first stage.
2. STMicroelectronics CLP270M CONCEPT
2.1. Evolution of the SLIC protection
Over the years, the silicon protection performances have considerably changed.
The first generation of products like SMTHBTxx and SMTHDTxx offered fixed overvoltage protection
against surges on either TIP or RING line in four
packages.
Fig. 2: Line card protection
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.
Programmable
thanks to any
external voltage
reference
I
+ISWON
Programmable
thanks to an
external resistor
V
Today, the CLP270M combines the features of all
the previous generations. In addition to that, it
offers an overcurrent detection when operating in
speech mode and also a Failure Status output
signal.
-ISWON
Line card
operating
conditions
3/24
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