CLP30-200B1 查看數據表（PDF） - STMicroelectronics

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CLP30-200B1

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

STMicroelectronics 

CLP30-200B1

Technical information

2.2.3

■ A second stage which is the external voltage reference device defines the firing threshold

voltage during the speech mode and also assumes a residual power overvoltage

suppression. This stage can be either a fixed or programmable device such as

LCP1511D.

Ringing mode

Figure 16. Switching by voltage during ringing mode

ILG

TIP

GND

RSENSE

TIPL

Overcurrent

detector

TIPS

1/2 CLP200M

OR

SW1

Overvoltage

detector

Overvoltage

reference

(> 200 V)

1

2

VLG

- 200

ILG

A1

1

3

2

1

VLG

+ 200

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 (+/- 200 V), 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 a tripolar protection.

When used alone, the CLP30-200B1 acts at the internal overvoltage reference level

(+/- 200V). 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 Figure 17.).

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