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參數(shù)資料
| 型號： | CLP270M-TR |
| 廠商： | 意法半導體 |
| 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)： | 7/24頁 |
| 文件大?。?/td> | 368K |
| 代理商： | CLP270M-TR |
CLP270M
7/24
The operating point moves to region 5 for positive surges or region 6 for negative surges.
Once the surge current falls below the switching-off current I
SWOFF
, the CLP270M returns to its initial state
(region 4).
The choice of the switching-on currents is function of the R
sense
resistors.
In normal operating condition the current (typically below -100 mA) should not activate the protection
device CLP270M. Therefore the level of activation is to be chosen just above this limit (-200 mA). This level
is adjusted through R
sense
.
Figures 7a and 7b enable the designers to choose the right R
sense
value.
EXAMPLE :
The choice of R
sense
= 4
ensures a negative triggering of -190 mA min and -320 mA max. In this case, the
positive triggering will be 150mA min and 280 mA max.
2.5. Failure Status
The CLP270M has an internal feature that allows the user to get a Failure Status (FS) indication. When the
CLP270M 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 provide 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 CLP270M occurs on the line, the device will fail in a
short-circuit state.
3
5
7
9
11
13
0.2
0.3
0.5
1
2
Rsense ( )
ISWON (T, Rsense) / ISWON (25°C, 4
)
@-20°C @25°C
@75°C
3
5
Rsense ( )
7
9
11
50
100
200
300
500
Iswon @ 25°C (mA)
Iswon min
negative
Iswon max
negative
Iswon min
positive
Iswon max
positive
Fig. 7a and 7b:
Switching-on current versus R
sense
.
CLP270M
Rsense
Rsense
1
FAILURE
STATUS
+12V
1k
Fig. 8:
Failure Status circuit and diagnostic.
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
10
10
20
50
100
200
500
1 000
2 000
5 000
t (ms)
Fig. 9 :
Operation limits and destruction zone of
the CLP270M.
相關PDF資料 |
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|---|---|
| CLP30-200B1RL | OVERVOLTAGE & OVERCURRENT PROTECTION FOR TELECOM LINE |
| CLP30-200B1 | Overvoltage and Overcurrent Protection for Telcom Line(電信裝備的過壓和過流保護) |
| CLT3-4BT6-TR | CURRENT LIMITED OVER-VOLTAGE PROTECTED QUAD DIGITAL TERMINATION |
| CLT3-4B | CURRENT LIMITED OVER-VOLTAGE PROTECTED QUAD DIGITAL TERMINATION |
| CLT3-4BT6 | CURRENT LIMITED OVER-VOLTAGE PROTECTED QUAD DIGITAL TERMINATION |
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