CLP270M-TR 데이터 시트보기 (PDF) - STMicroelectronics

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CLP270M-TR

OVERVOLTAGE AND OVERCURRENT PROTECTION FOR TELECOM LINE

STMicroelectronics 

Fig. 4: Switching by voltage during ringing mode.

Fuse

ILG

TIP

Rsense

TIPL

TIPS

1

Overcurrent

detector

1/2 CLP270M

Rp

2

OR

SW3 SW1

Overvoltage Overvoltage

VLG

detector

reference

(+/- 270 V)

FS

GND

CLP270M

ILG

A1

2

1

-270

V

+270

3

2.3. Ringing mode

In ringing mode (Ring relay in position 2), the only protection device involved is the CLP270M.

In normal conditions, the CLP270M operates in region 1 of A1 curve, and is idle.

If an overvoltage occuring between TIP (or RING) and GND reaches the internal overvoltage reference

(+/- 270 V), the CLP270M 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 falls below

the switch off current ISWOFF, the device returns to its initial state (region 1).

For surges occuring between TIP and RING, the CLP270M acts in the same way. This means that the

CLP270M ensures a tripolar protection.

When used alone, the CLP270M acts at the internal overvoltage reference level (+/- 270 V). Furthermore, it

is possible to adjust this threshold level to a lower voltage by using:

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

1

Fuse

TIP

Rsense

Rp

TIPL

Overcurrent

detector

TIPS

2

VZ1

OR

SW3 SW1

FS

SW4 SW2

OR

Overvoltage

detector

Overvoltage

reference

(+/- 270 V)

Overvoltage

detector

Overvoltage

reference

(+/- 270 V)

GND

VZ2

VZ3

Overcurrent

detector

RINGL

RINGS

VZ4

1

RING

Rsense

Rp

Fuse

2

5/24

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