CLP270M-TR 데이터 시트보기 (PDF) - STMicroelectronics

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CLP270M-TR

OVERVOLTAGE AND OVERCURRENT PROTECTION FOR TELECOM LINE

STMicroelectronics 

CLP270M

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

Fuse

TIP

Rsense

Rp

TIPL

TIPS

Overcurrent

detector

OR

SW3 SW1

FS

SW4 SW2

OR

Overvoltage

detector

Overvoltage

reference

(+/- 270 V)

Overvoltage

detector

Overvoltage

reference

(+/- 270 V)

GND

RING

Fuse

Overcurrent

detector

RINGL

RINGS

Rsense

Rp

Fig. 6: Switching by current during speech mode.

ILG

Fuse

TIP

Rsense

TIPL

TIPS

1

Overcurrent

detector

OR

SW3 SW1

Overvoltage

detector

Overvoltage

reference

(+/- 270 V)

Rp

2

VLG

FS

GND

-Vbat

External

voltage

reference

1

2

VB1

VB2

1

2

ILG

A2

4

-VREF2

5

VREF1

6

VLG

s up to 4 fixed external voltage reference (VZ1 to VZ4) (see fig. 5a, here-below).

s external reference supplies, Vb1 and Vb2 (see fig. 5b, on next page).

2.4. Speech mode

In speech mode (Ring relay in position 1), the protection is provided by the combination of both CLP270M

and the external voltage reference device.

In normal conditions, the working point of this circuit is located in region 4 of A2 curve : the CLP270M 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.

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