CLP30-200B1(1999) 데이터 시트보기 (PDF) - STMicroelectronics

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CLP30-200B1
(Rev.:1999)

OVERVOLTAGE & OVERCURRENT PROTECTION FOR TELECOM LINE

STMicroelectronics 

The choice of the switching-on current is function of the RSENSE resistors.

Fig . 7a and 7b : Switching-on current versus RSENSE

CLP30-200B1

Iswon negative surge ( mA )

1000

Iswon - @ 0°C Iswon - @ +25°C Iswon - @ +70°C

Iswon @ 25°C ( mA )

1000

Iswon + min Iswon + max Iswon - min Iswon - max

Rsense ( Ohms )

Rsense ( Ohms )

100

100

1.6

3

6

1.6

3

6

This current (typically above 150 mA) should not activate the protection device CLP30-200B1.

Therefore the level of activation is to be chosen just below this limit (typically 200mA). This level is adjusted

through RSENSE.

Figures 7a and 7b enable the designers to choose the right RSENSE value.

Example: The choice of RSENSE = 3 Ω ensures a negative triggering of -280 mA min and -380mA max.

In this case, the positive triggering will be 220mA min and 320mA max.

Thanks to the CLP30-200B1 topology, the surge current in the line is reduced after it.

Because the remaining surge energy is low, the power ratings of RP, the relay contacts and the external

voltage reference device may be kept low. This results in a significant cost reduction for the whole system.

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