CLP30-200B1 datasheet(5/11 Pages) STMICROELECTRONICS

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CLP30-200B1

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2.3 Ringing mode

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

protection device involved is the CLP30-200B1.

In normal conditions, the CLP30-200B1 operates

in region 1 of A1 curve, and is idle.

If an overvoltage occurring between TIP (or RING)

and

GND

reaches

the

internal

overvoltage

reference (+/- 200V), the CLP30-200B1 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 disappears, the device returns to its

initial state (region 1).

For surges occurring between TIP and RING, the

CLP30-200B1 acts in the same way. This means

that

the

CLP30-200B1

ensures

tripolar

protection.

When used alone, the CLP30-200B1 acts at the

internal overvoltage reference level (+/- 200 V).

Furthermore, it is possible to adjust this threshold

level to a lower voltage by using up to 4 fixed

external voltage reference (VZ1 to VZ4) (see fig.5).

R sense

Overvoltage

reference

(>200V)

Overvoltage

detector

Overcurrent

detector

TIPL

TIPS

SW1

TIP

GND

ILG

VLG

1/2 CLP200M

ILG

VLG

-200

+200

Fig.4 : Switching by voltage during ringing mode.

RINGS

R sense

Overvoltage

reference

(>200V)

Overvoltage

detector

Overcurrent

detector

Overvoltage

reference

(>200V)

Overvoltage

detector

Overcurrent

detector

TIPL

TIPS

RINGL

GND

SW1

SW2

R sense

TIP

RING

VZ1

VZ2

VZ3

VZ4

Fig.5 : Methode to adjust the reference voltage.

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