ADUM7442CRQZ-RL7 查看數據表（PDF） - Analog Devices

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ADUM7442CRQZ-RL7

1 kV RMS Quad-Channel Digital Isolators

Analog Devices 

ADuM7440/ADuM7441/ADuM7442

The insulation lifetime of the ADuM744x depends on the

voltage waveform type imposed across the isolation barrier.

The iCoupler insulation structure degrades at different rates

depending on whether the waveform is bipolar ac, unipolar

ac, or dc. Figure 20, Figure 21, and Figure 22 illustrate these

different isolation voltage waveforms.

Bipolar ac voltage is the most stringent environment. The goal

of a 50-year operating lifetime under the ac bipolar condition

determines the Analog Devices recommended maximum

working voltage.

In the case of unipolar ac or dc voltage, the stress on the insu-

lation is significantly lower. This allows operation at higher

working voltages while still achieving a 50-year service life.

The working voltages listed in Table 18 can be applied while

maintaining the 50-year minimum lifetime provided the voltage

conforms to either the unipolar ac or dc voltage case. Any cross-

insulation voltage waveform that does not conform to Figure 21

or Figure 22 should be treated as a bipolar ac waveform, and its

peak voltage should be limited to the 50-year lifetime voltage

value listed in Table 18.

Note that the voltage presented in Figure 21 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.

RATED PEAK VOLTAGE

0V

Figure 20. Bipolar AC Waveform

RATED PEAK VOLTAGE

0V

Figure 21. Unipolar AC Waveform

RATED PEAK VOLTAGE

0V

Figure 22. DC Waveform

Rev. B | Page 16 of 20

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