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CLP30-200B1 Datasheet(PDF) 3 Page - STMicroelectronics

No. de Pieza. CLP30-200B1
Descripción  OVERVOLTAGE & OVERCURRENT PROTECTION FOR TELECOM LINE
Descarga  11 Pages
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Fabricante  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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CLP30-200B1 Datasheet(HTML) 3 Page - STMicroelectronics

 
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CLP30-200B1
3/11
telecommunication
"PRIMARY PROTECTION"
MDF
LINE CARD
EXCHANGE
line
SLIC
"SECONDARY PROTECTION"
CLP30-
200B1
VOLTAGE
REFERENCE
Fig.1 : Suscriber line protection topology
1.INTRODUCTION
The aim of this section is to show the behavior of
our new telecom line protection device.
Figure 1 is a simplified block diagram of a
subscriber line protection that is mainly used so
far.
This shows two different things :
s
A “primary protection” located on the Main Dis-
tribution Frame (MDF) eliminates coarsely the
high energy environmental disturbances (light-
ning transients and AC power mains distur-
bances) for which the ITU-T-K20 requires a 4kV
10/700
µs test. This can be assumed either by
gas-tubes or silicon protection such as the
TLPxxM.
s
A “secondary protection” located on the line
card eliminates finely the remaining transients
that have not been totally suppressed by the
first stage. The ITU-T-K20 requires a 1 kV
10/700
µs test. At this stage, the protection is
managed by the CLP30-200B1.
2. STMicroelectronics CLP30-200B1 CONCEPT
2.1 Evolution of the SLIC protection
Over the years, the performances of the SLICs
considerably increased and therefore the need of
the protection has also evolved.
The CLP30-200B1 is especially designed for the
protection of this new generation of SLIC. For this,
it is based on both overvoltage and overcurrent
protection modes.
The figure 2 summarises the performance of the
CLP30-200B1 which basically holds the SLIC
inside its correct voltage and current values.
-I
SWON
Programmable thanks to
an external resistor
Programmable thanks to
any external voltage reference
V
I
Line Card operating conditions
+I
SWON
-V
SWON
+V
SWON
Fig.2 : Line card protection
Pin
Symbol
Description
1
TIPL
TIP (Line side)
2/3/6/7
GND
Ground
4
RINGL
RING (Line side)
5
RINGS
RING (SLIC side)
8
TIPS
TIP (SLIC side)
APPLICATION NOTE


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