CLP200M datasheet(5/21 Pages) STMICROELECTRONICS

5 / 21 page

2.3 Ringing mode

Fig. 4 : Switching by voltage during ringing mode.

Rsens e

Overvoltage

reference

(+/- 215 V)

Overvoltage

detector

Overcurrent

detector

TIPL

TIPS

SW3 SW1

Fuse

TIP

GND

ILG

VLG

1/2 CLP200M

ILG

VLG

-215

+215

Fig. 5a : Method to adjust the reference voltage.

RINGS

R sense

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

Fuse

TIP

RING

VZ1

VZ2

VZ3

VZ4

In ringing mode (Ring relay in position 2), the only

protectiondevice involved is the CLP200M.

In normal conditions, the CLP200M operates in re-

gion 1 of A1 curve, and is idle.

If an overvoltage occuring between TIP (or RING)

and GND reaches the internal overvoltage refe-

rence (+/- 215V), the CLP200M acts and the line is

short-circuited to GND. At this time the operating

point moves to region 2 for positive surges (region

3 for negative surges). Once the surge current dis-

appears, the device returns to its initial state (re-

gion 1).

For surges occuring between TIP and RING, the

CLP200M acts in the same way. This means that

the CLP200M ensures a tripolar protection.

When used alone, the CLP200M acts at the inter-

nal overvoltage reference level (+/- 215V). Further-

more, it is possible to adjust this threshold level to

a lower voltage by using :

. up to 4 fixedexternal voltage reference(V

Z1 to

VZ4) (see fig.5a).

CLP200M

5/21

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