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 

Technical information

Figure 17. Method to adjust the reference voltage

TIP

RING

GND

RSENSE

TIPL

Overcurrent

detector

TIPS

OR

SW1

SW2

OR

Overvoltage

detector

Overvoltage

reference

(> 200 V)

Overvoltage

detector

Overvoltage

reference

(> 200 V)

GND

Overcurrent

detector

RINGL

RSENSE

RINGS

CLP30-200B1

1

2

VZ1

VZ2

VZ3

VZ4

1

2

2.2.4

Speech mode

Figure 18. Switching by current during speech mode

ILG

TIP

GND

RSENSE

TIPL

Overcurrent

detector

TIPS

OR

SW1

Overvoltage

detector

Overvoltage

reference

(> 200 V)

1

2

VLG

Rp

- VBAT

External

voltage

reference

ILG

6

- VBAT

4

5

VLG

10/15

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.

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