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

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CLP30-200B1
(Rev.:1999)

OVERVOLTAGE & OVERCURRENT PROTECTION FOR TELECOM LINE

STMicroelectronics 

CLP30-200B1

2.4 Speech mode

Fig.6 : Switching by current during speech mode.

ILG

TIP

R sense

TIPL

TIPS

Overcurrent

detector

GND

OR

SW1

Overvoltage

detector

Overvoltage

reference

(>200V)

1

2

VLG

Rp

-Vbat

External

voltage

reference

ILG

6

4

-VBAT

5

VLG

In speech mode (Ring relay in position 1), the

protection is provided by the combination of both

CLP30-200B1 and the external voltage reference

device (for example LCP1511D).

In normal conditions, the working point of this

circuit is located in region 4 of A2 curve :

the CLP30-200B1 is idle.

When a surge occurs on the line, the external

voltage reference device clamps at GND or -Vbat

respectively for positive and negative surges. This

generates a current which is detected by RSENSE

and causes the protection to act : the line is

short-circuited to GND. The operating point moves

to region 6 for positive surges or region 5 for

negative surges.

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 :

s simultaneously on both TIP and RING lines

versus GND.

s between TIP and RING.

s on TIP (or RING) versus GND.

6/11

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