CLP200M datasheet(6/21 Pages) STMICROELECTRONICS

6 / 21 page

external reference supplies, Vb1 and Vb2 (see fig.5b)..

Fig. 5b : 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

VB1

VB2

2.4 Speech mode

Fig. 6 : Switching by current during speech mode.

R sense

Overvoltage

reference

(+/- 215 V)

Overvoltage

detector

Overcurrent

detector

TIPL

TIPS

SW3 SW1

Fuse

TIP

GND

-Vbat

External

voltage

reference

ILG

VLG

ILG

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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