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CLP200M Datasheet(Fiches technique) 4 Page - STMicroelectronics

Numéro de pièce CLP200M
Description  OVERVOLTAGE AND OVERCURRENT PROTECTION FOR TELECOM LINE
Télécharger  21 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
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CLP200M Datasheet(HTML) 4 Page - STMicroelectronics

 
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APPLICATION CIRCUIT : CLP200M in line card
Fig. 3 : CLP200M in line card
RINGS
-Vbat
-Vbat
Rp
R sense
TIP
1
1
2
2
SLIC
(*)
(*) LCP1511D or THDT series
Overvoltage
reference
(+/- 215 V)
Over voltage
detector
Overcurrent
detector
OR
Overvoltage
reference
(+/- 215 V)
Over voltage
detector
Overcurrent
detector
OR
TIPL
TIPS
RINGL
FS
GND
SW3 SW1
SW4 SW2
R sense
Rp
Ring
Generator
Fuse
Fuse
TIP
RING
External
voltage
reference
RING
I
Figure 3 above shows the topology of a protected
analog subscriber line at the exchange side. The
CLP200M is connected to the ring relay via two
balanced Rp resistors, and to the Subscriber Line
Interface Circuit. A second device is located near
the SLIC : it can be either a LCP1511D or a THDT
series.
These two devices are complementary and their
functions are explained below :
The first stage based on CLP200 M manages
the high power issued from the external
surges. When used in ringing mode, the
CLP200M operates in voltage mode and pro-
vides
a
symmetrical
and
bidirectional
overvoltage protection at +/-215 V on both TIP
and RING lines. When used in speech mode,
the CLP200M operates in current mode and
the activation current of the CLP200M is ad-
justed by RSENSE.
The second stage is the external voltage refer-
ence device which defines the firing threshold
voltage during the speech mode and also as-
sumes
a
residual
power
overvoltage
suppression. This protection stage can be either
a fixed or programmable breakover device. The
THDTxx family acts as a fixed breakover device
while the LCP1511D operates as a programma-
ble protection.
Thanks to this topology, the surge current in the
line is reduced after the CLP200M. Because the
remaining surge energy is low, the power ratings of
Rp, the ring relay contacts and the external voltage
reference circuit may be downsized. This results in
a significant cost reduction.
®
CLP200M
4/21


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