Obsolete

Product(s)

- Obsolete

Product(s)

Obsolete

Product(s)

- Obsolete

Product(s)

APPLICATION NOTE

6/13

5. Failure Status

The CLP270M has an internal feature that allows

the user to get a Failure Status (FS) indication.

When the CLP270M is short-circuiting the line to

GND, a signal can be managed through pin 1. This

signal can be used to turn a LED on in order to

provide a surge indication. It may also be used with

a

logic

circuitry

to

count

the

number

of

disturbances appearing on the lines.

If a surge exceeding the maximum ratings of the

CLP270M occurs on the line, the device will fail in a

short-circuit state.

CLP270M

Rsense

Rsense

1

FAILURE

+12V

1k

STATUS

Fig. 8: Failure Status circuit and diagnostic.

0.01

0.02

0.05

0.1

0.2

0.5

1

2

5

10

10

20

50

100

200

500

1 000

2 000

5 000

t (ms)

Fig. 9 : Operation limits and destruction zone of

the CLP270M.

1. BELLCORE GR-1089-CORE requirements:

Tables 1 and 2 summarize the lighting surges required by the bellcore 1089.

Tables 1 to 6 summarize the surge needs defined by Bellcore regarding both lightning and AC power fault.

In case of first level test, the equipment under test shall be operating after the surge. For the second level

tests, the equipment under test may be damaged, but no fire or electrical safety hazard may occur.

CLP270M TEST RESULTS ACCORDING TO BELLCORE 1089 REQUIREMENTS

The figure 9 shows two different curves :

n

The

lower

one

indicates

the

maximum

guaranted working limits of the CLP270M.

The upper curve shows the limit above which the

CLP270M is completely destructed . In this case,

the Fail Diagnostic pin is on.