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CLP200M Datasheet(PDF) 6 Page - STMicroelectronics

No. de Pieza. CLP200M
Descripción  OVERVOLTAGE AND OVERCURRENT PROTECTION FOR TELECOM LINE
Descarga  21 Pages
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Fabricante  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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CLP200M Datasheet(HTML) 6 Page - STMicroelectronics

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external reference supplies, Vb1 and Vb2 (see fig.5b)..
Fig. 5b : 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
VB1
VB2
2.4 Speech mode
Fig. 6 : Switching by current during speech mode.
R sense
Rp
1
2
Overvoltage
reference
(+/- 215 V)
Overvoltage
detector
Overcurrent
detector
OR
TIPL
TIPS
FS
SW3 SW1
Fuse
TIP
GND
-Vbat
External
voltage
reference
ILG
VLG
ILG
V
A2
LG
4
5
6
VREF1
-VREF2
In speech mode (Ring relay in position 1), the pro-
tection is provided by the combination of both
CLP200M and the external voltage reference de-
vice.
In normal conditions, the working point of this cir-
cuit is located in region 4 of A2 curve : the
CLP200M is idle.
When a surge occurs on the line, the external volt-
age reference device clamps at GND or -Vbat re-
spectively 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 5 for positive
surges or region 6 for negative surges.
Once the surge current falls below the switching-
off current ISWOFF, the CLP200M returns to its in-
itial state (region 4).
Furthermore, the CLP200M switches when an
overvoltage, either positive or negative, occurs
either :
simultaneously on both TIP and RING lines ver-
sus GND.
between TIP and RING.
on TIP (or RING) versus GND.
®
CLP200M
6/21


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