NOTE

Possible effect on the device of a Vbat variation

Be aware that a variation of Vbat during operation, when the switches are on can cause anomalous be-

haviour. To avoid that a turn-off occurs the variation should have a rise time equal or lower than

20V/

µs (fig. 5), and a fall time equal or lower than 2.0V/µs (fig.6).

Vbat0

Vbat1

Fail dV/dt > 25V/

µs

OK dV/dt < 20V/

µs

D97TL303

Figure 5: Typical rise time behaviour.

Vbat0

Vbat1

Fail dV/dt > 2.4V/

µs

OK dV/dt < 2.0V/

µs

D97TL304

Figure 6: Typical fall time behaviour.

STLC5444

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