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CLP30-200B1 Datasheet(PDF) 6 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) 6 Page - STMicroelectronics

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2.4 Speech mode
In speech mode (Ring relay in position 1), the
protection is provided by the combination of both
CLP30-200B1 and the external voltage reference
device (for example LCP1511D).
In normal conditions, the working point of this
circuit is located in region 4 of A2 curve :
the CLP30-200B1 is idle.
When a surge occurs on the line, the external
voltage reference device clamps at GND or -Vbat
respectively for positive and negative surges. This
generates a current which is detected by RSENSE
and causes the protection to act : the line is
short-circuited to GND. The operating point moves
to region 6 for positive surges or region 5 for
negative surges.
Once
the
surge
current
falls
below
the
switching-off current ISWOFF, the CLP30-200B1
returns to its initial state (region 4).
Furthermore, the CLP30-200B1 switches when an
overvoltage, either positive or negative, occurs
either :
s
simultaneously on both TIP and RING lines
versus GND.
s
between TIP and RING.
s
on TIP (or RING) versus GND.
ILG
VLG
4
6
5
-VBAT
R sense
Rp
1
2
Overvoltage
reference
(>200V)
Overvoltage
detector
Overcurrent
detector
OR
TIPL
TIPS
SW1
TIP
GND
-Vbat
External
voltage
reference
ILG
VLG
Fig.6 : Switching by current during speech mode.


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