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CLP270M Datasheet(PDF) 6 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) 6 Page - STMicroelectronics

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up to 4 fixed external voltage reference (VZ1 to VZ4) (see fig. 5a, here-below).
s
external reference supplies, Vb1 and Vb2 (see fig. 5b, on next page).
2.4. Speech mode
In speech mode (Ring relay in position 1), the protection is provided by the combination of both CLP270M
and the external voltage reference device.
In normal conditions, the working point of this circuit is located in region 4 of A2 curve : the CLP270M 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.
RINGS
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
Rsense
1
2
Fuse
Fuse
TIP
RING
VB1
VB2
Rp
Rp
Fig. 5b: Method to adjust the reference voltage.
Rsense
Rp
1
2
Overvoltage
reference
(+/- 270 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
Fig. 6: Switching by current during speech mode.


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