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CLP30-200B1 Datasheet(PDF) 5 Page - STMicroelectronics

No. de Pieza. CLP30-200B1
Descripción  OVERVOLTAGE & OVERCURRENT PROTECTION FOR TELECOM LINE
Descarga  11 Pages
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Fabricante  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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CLP30-200B1 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 CLP30-200B1.
In normal conditions, the CLP30-200B1 operates
in region 1 of A1 curve, and is idle.
If an overvoltage occurring between TIP (or RING)
and
GND
reaches
the
internal
overvoltage
reference (+/- 200V), the CLP30-200B1 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 disappears, the device returns to its
initial state (region 1).
For surges occurring between TIP and RING, the
CLP30-200B1 acts in the same way. This means
that
the
CLP30-200B1
ensures
a
tripolar
protection.
When used alone, the CLP30-200B1 acts at the
internal overvoltage reference level (+/- 200 V).
Furthermore, it is possible to adjust this threshold
level to a lower voltage by using up to 4 fixed
external voltage reference (VZ1 to VZ4) (see fig.5).
R sense
1
2
Overvoltage
reference
(>200V)
Overvoltage
detector
Overcurrent
detector
OR
TIPL
TIPS
SW1
TIP
GND
ILG
VLG
1/2 CLP200M
ILG
VLG
1
2
3
-200
+200
A1
1
Fig.4 : Switching by voltage during ringing mode.
RINGS
R sense
1
2
Overvoltage
reference
(>200V)
Overvoltage
detector
Overcurrent
detector
OR
Overvoltage
reference
(>200V)
Overvoltage
detector
Overcurrent
detector
OR
TIPL
TIPS
RINGL
GND
SW1
SW2
R sense
1
2
TIP
RING
VZ1
VZ2
VZ3
VZ4
Fig.5 : Methode to adjust the reference voltage.


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