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CLP30-200B1

ASD (Application Specific Devices) Overvoltage and overcurrent protection for telecom line

STMicroelectronics 

CLP30-200B1

Technical information

Once the surge current falls below the switching-off current ISWOFF, the CLP30-200B1

returns to its initial state (region 4).

Furthermore, the CLP30-200B1 switches when an overvoltage, either positive or negative,

occurs either:

■ simultaneously on both TIP and RING lines versus GND

■ between TIP and RING

■ on TIP (or RING) versus GND

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

Figure 19.

Switching-on current versus

RSENSE: relative variation of ISWON

versus RSENSE at various

temperature

Figure 20. Switching-on current versus

RSENSE: relative variation of ISWON

versus RSENSE at Tamb = 25° C

ISWON (mA)

600

500

400

300

200

ISWON @ 0° C ISWON @ 25° C ISWON @ 70° C

100

2

RSENSE ( Ω )

3

4

5

6

7 8 9 10

ISWON @ 25° C (mA)

500

ISWON min

negative

ISWON max

negative

ISWON min

positive

ISWON max

positive

300

200

100

3

RSENSE ( Ω )

5

7

9

11

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 200 mA). 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 -380 mA

maximum.

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

11/15

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