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CLP270M Datasheet(PDF) 5 Page - STMicroelectronics

No. de Pieza. CLP270M
Descripción  OVERVOLTAGE AND OVERCURRENT PROTECTION FOR TELECOM LINE
Descarga  24 Pages
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Fabricante  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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CLP270M Datasheet(HTML) 5 Page - STMicroelectronics

 
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2.3. Ringing mode
In ringing mode (Ring relay in position 2), the only protection device involved is the CLP270M.
In normal conditions, the CLP270M operates in region 1 of A1 curve, and is idle.
If an overvoltage occuring between TIP (or RING) and GND reaches the internal overvoltage reference
(+/- 270 V), the CLP270M 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 falls below
the switch off current ISWOFF, the device returns to its initial state (region 1).
For surges occuring between TIP and RING, the CLP270M acts in the same way. This means that the
CLP270M ensures a tripolar protection.
When used alone, the CLP270M acts at the internal overvoltage reference level (+/- 270 V). Furthermore, it
is possible to adjust this threshold level to a lower voltage by using:
Rsense
Rp
1
2
Overvoltage
reference
(+/- 270 V)
Overvoltage
detector
Overcurrent
detector
OR
TIPL
TIPS
FS
SW3 SW1
Fuse
TIP
GND
ILG
VLG
1/2 CLP270M
ILG
V
1
2
3
-270
+270
A1
Fig. 4: Switching by voltage during ringing mode.
RINGS
Rsense
Rsense
1
2
Overvoltage
reference
(+/- 270 V)
Overvoltage
detector
Overcurrent
detector
OR
Overvoltage
reference
(+/- 270 V)
Overvoltage
detector
Overcurrent
detector
OR
TIPL
TIPS
RINGL
FS
GND
SW3 SW1
SW4 SW2
1
2
Fuse
Fuse
TIP
RING
VZ1
VZ2
VZ3
VZ4
Rp
Rp
Fig. 5a: Method to adjust the reference voltage.


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