CLP200M datasheet(7/21 Pages) STMICROELECTRONICS

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Fig. 7a and 7b

: Switching-on current versus

RSENSE.

0.01

0.1

100

1000

t (ms)

Ipp (A)

Fig. 9 : Operation limits and destruction zone of

the CLP200M.

CLP200M

Rsense

FAILURE

+12V

STATUS

Fig. 8 : Failure Status circuit and diagnostic.

100

200

300

500

Rsense ( )

Ω

ISWON (mA)

-20°C

25°C

75°C

100

200

300

500

Rsense ( )

Ω

Iswon @ 25°C (mA)

Iswon min

Iswon max

Iswon min

negative

positive

The choice of the switching-on current is function

of the RSENSE resistors.

In normal operating condition, only the negative

current of the signal is of interest. This current (typ-

ically below -150 mA) should not activate the pro-

tection device CLP200M. Therefore the level of

activation is to be chosen just above this limit (typi-

cally -200 mA). This level is adjusted through

RSENSE.

Figures 7a and 7b enable the designers to choose

the right RSENSE value.

EXAMPLE :

The choice of RSENSE =4

Ω ensures a negative

triggering of -220 mA min and -320 mA max. In this

case, the positive triggering will be 180mA min and

280 mA max.

2.5 . Failure Status

The CLP200M has an internal feature that allows

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

When the CLP200M 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 pro-

vide 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

CLP200M occurs on the line, the device will fail in a

short-circuit state.

The figure 9 shows two different curves :

The

lower

one

indicates

the

maximum

guaranted working limits of the CLP200M.

The upper curve shows the limit above which the

CLP200M is completely destructed . In this case,

the Fail Diagnostic pin is on.

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