Datasheet

Data Sheet ADuM1440/ADuM1441/ADuM1442/ADuM1445/ADuM1446/ADuM1447
Rev. E | Page 23 of 25
In the case of unipolar ac or dc voltage, the stress on the insulation
is significantly lower. This allows operation at higher working
voltages while still achieving a 50-year service life. The working
voltages listed in Table 20 can be applied while maintaining the
50-year minimum lifetime provided the voltage conforms to
either the unipolar ac or dc voltage case. Treat any cross-insulation
voltage waveform that does not conform to Figure 35 or Figure 36
as a bipolar ac waveform, and limit its peak voltage to the 50-year
lifetime voltage value listed in Table 20.
Note that the voltage presented in Figure 35 is shown as sinusoidal
for illustration purposes only. It is meant to represent any voltage
waveform varying between 0 V and some limiting value. The
limiting value can be positive or negative, but the voltage cannot
cross 0 V.
0V
RATED PEAK VOLTAGE
11845-022
Figure
34. Bipolar AC Waveform
0V
RATED PEAK VOLTAGE
11845-023
Fi
gure 35. Unipolar AC Waveform
0V
RATED PEAK VOLTAGE
11845-024
Figure 36. DC
Waveform