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CLP200M Datasheet(PDF) 7 Page - STMicroelectronics

No. de Pieza. CLP200M
Descripción  OVERVOLTAGE AND OVERCURRENT PROTECTION FOR TELECOM LINE
Descarga  21 Pages
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Fabricante  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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CLP200M Datasheet(HTML) 7 Page - STMicroelectronics

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Fig. 7a and 7b
: Switching-on current versus
RSENSE.
Fig. 9 : Operation limits and destructionzone of the
CLP200M.
Fig. 8 : Failure Status circuit and diagnostic.
3
5
7
9
11
13
100
200
300
500
Rsense ( )
ISWON (mA)
-20
°C25°C75°C
35
7
9
11
100
200
300
500
Rsense ( )
Iswon @ 25
°C (mA)
Iswon min
Iswon max
Iswon min
Iswon min
negative
negative
positive
positive
CLP200M
Rsense
Rsense
1
FAILURE
+12V
1k
STATUS
0.01
0.1
1
10
10
100
1000
t (ms)
Ipp (A)
The choice of the switching-on current is function
of the RSENSE resistors.
In normal operating condition, only the negative
current of the signal is of interest.This current (typi-
cally below -150 mA) should not activate the pro-
tection device CLP200M. Therefore the level of
activation is to be chosen just above this limit (typi-
cally -200 mA). This level is adjusted through
RSENSE.
Figures 7a and 7b enable the designers to choose
the right RSENSE value.
EXAMPLE :
The choice of RSENSE =4
Ω ensures a negative
triggering of -220 mA min and -320 mA max. In this
case, the positive triggering will be 180mA min and
280 mA max.
2.5 . Failure Status
The CLP200M has an internal feature that allows
the user to get a Failure Status (FS) indication.
When the CLP200M is short-circuiting the line to
GND, a signal can be managed through pin 1. This
signal can be used to turn a LED on in order to pro-
vide a surge indication. It may also be used with a
logic circuitry to count the number of disturbances
appearing on the lines.
If a surge exceeding the maximum ratings of the
CLP200M occurs on the line, the device will fail in
a short-circuit state.
The figure 9 shows two different curves :
The lower one indicates the maximum guaranted
working limits of the CLP200M.
The upper curve shows the limit above which the
CLP200M is completely destructed . In this case,
the Fail Diagnostic pin is on.
®
CLP200M
7/21


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