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CLP200M Datasheet(Fiches technique) 5 Page - STMicroelectronics

Numéro de pièce CLP200M
Description  OVERVOLTAGE AND OVERCURRENT PROTECTION FOR TELECOM LINE
Télécharger  21 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
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 5 page
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2.3 Ringing mode
Fig. 4 : Switching by voltage during ringing mode.
Rsens e
Rp
1
2
Overvoltage
reference
(+/- 215 V)
Overvoltage
detector
Overcurrent
detector
OR
TIPL
TIPS
FS
SW3 SW1
Fuse
TIP
GND
ILG
VLG
1/2 CLP200M
ILG
VLG
1
2
3
-215
+215
A1
Fig. 5a : Method to adjust the reference voltage.
RINGS
R sense
Rp
1
2
Overvoltage
reference
(+/- 215 V)
Overvoltage
detector
Overcurrent
detector
OR
Overvoltage
reference
(+/- 215 V)
Overvoltage
detector
Overcurrent
detector
OR
TIPL
TIPS
RINGL
FS
GND
SW3 SW1
SW4 SW2
R sense
1
2
Rp
Fuse
Fuse
TIP
RING
VZ1
VZ2
VZ3
VZ4
In ringing mode (Ring relay in position 2), the only
protectiondevice involved is the CLP200M.
In normal conditions, the CLP200M operates in re-
gion 1 of A1 curve, and is idle.
If an overvoltage occuring between TIP (or RING)
and GND reaches the internal overvoltage refe-
rence (+/- 215V), the CLP200M acts and the line is
short-circuited to GND. At this time the operating
point moves to region 2 for positive surges (region
3 for negative surges). Once the surge current dis-
appears, the device returns to its initial state (re-
gion 1).
For surges occuring between TIP and RING, the
CLP200M acts in the same way. This means that
the CLP200M ensures a tripolar protection.
When used alone, the CLP200M acts at the inter-
nal overvoltage reference level (+/- 215V). Further-
more, it is possible to adjust this threshold level to
a lower voltage by using :
. up to 4 fixedexternal voltage reference(V
Z1 to
VZ4) (see fig.5a).
®
CLP200M
5/21




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