CLP200M datasheet(4/21 Pages) STMICROELECTRONICS

4 / 21 page

Obsolete

Product(s)

- Obsolete

Product(s)

CLP200M

4/21

RINGS

-Vbat

R sense

TIP

SLIC

(*)

(*) LCP1511D or THDT series

Overvoltage

reference

(+/- 215 V)

Overvoltage

detector

Overcurrent

detector

Overvoltage

reference

(+/- 215 V)

Overvoltage

detector

Overcurrent

detector

TIPL

TIPS

RINGL

GND

SW3 SW1

SW4 SW2

R sense

Ring

Generator

Fuse

TIP

RING

External

voltage

reference

RING

APPLICATION CIRCUIT : CLP200M in line card

Fig. 3 : CLP200M in line card

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 CLP200M manages

the high power issued from the external

surges. When used in ringing mode, the

CLP200M operates in voltage mode and pro-

vides

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

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.

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