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參數(shù)資料
| 型號： | CLP200M |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | OVERVOLTAGE AND OVERCURRENT PROTECTION FOR TELECOM LINE |
| 中文描述： | 過壓和過流保護的電信線路保護 |
| 文件頁數(shù)： | 7/21頁 |
| 文件大小： | 232K |
| 代理商： | CLP200M |
Fig. 7a and 7b
R
SENSE
.
:
Switching-on current versus
Fig.9:
Operationlimitsanddestructionzoneof the
CLP200M.
Fig. 8 :
FailureStatuscircuit anddiagnostic.
3
5
7
9
11
13
100
200
300
500
Rsense ( )
ISWON (mA)
-20
°
C
25
°
C
75
°
C
3
5
Rsense ( )
7
9
11
100
200
300
500
Iswon @ 25
°
C (mA)
Iswon min
negative
Iswon max
negative
Iswon min
positive
Iswon min
positive
Rsense
Rsense
1
FAILURE
STATUS
+12V
1k
0.01
0.1
1
10
10
100
1000
t (ms)
Ipp (A)
The choice of the switching-on current is function
of the R
SENSE
resistors.
In normal operating condition, only the negative
currentofthesignal isof interest.Thiscurrent(typi-
cally below -150 mA) should not activate the pro-
tection device CLP200M. Therefore the level of
activationis to be chosenjustabove thislimit(typi-
cally -200 mA). This level is adjusted through
R
SENSE
.
Figures7a and 7b enablethe designersto choose
theright R
SENSE
value.
EXAMPLE:
The choice of R
SENSE
= 4
ensures a negative
triggeringof -220mAmin and-320mA max.Inthis
case,thepositive triggeringwillbe 180mAminand
280mA max.
2.5. FailureStatus
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, asignalcan be managedthroughpin 1.This
signalcan be usedtoturna LEDon inorderto pro-
vide a surge indication.It may also be used with a
logic circuitry to count the number of disturbances
appearingon thelines.
If a surge exceeding the maximum ratings of the
CLP200Moccurs on the line, the devicewill fail in
a short-circuitstate.
Thefigure 9 showstwo differentcurves:
Theloweroneindicatesthemaximumguaranted
workinglimitsof the CLP200M.
Theuppercurveshowsthelimit abovewhich the
CLP200Mis completelydestructed. In thiscase,
theFail Diagnosticpinis on.
CLP200M
7/21
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