ADUM5404CRWZ【PDF 25/28 页】IC ISOLATOR 4CH DCDC CONV 16SOIC

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Data Sheet

ADuM5401/ADuM5402/ADuM5403/ADuM5404

Table 27 illustrates how iso Power devices can provide many combinations of data channel count and multiples of the single unit power.

Table 27. Configurations for Power and Data Channels

Number of Data Channels

Power Unit

1-Unit Power

0 Channels

ADuM5000 master

2 Channels

ADuM520x master

4 Channels

ADuM5401 to ADuM5404 master

6 Channels

ADuM5401 to ADuM5404 master

ADuM121x

2-Unit Power

3-Unit Power

ADuM5000 master

ADuM5000 slave

ADuM5000 master

ADuM5000 slave

ADuM5000 slave

ADuM5000 master

ADuM520x slave

ADuM5000 master

ADuM5000 slave

ADuM520x slave

ADuM5401 to ADuM5404 master

ADuM520x slave

ADuM5401 to ADuM5404 master

ADuM5000 slave

ADuM5000 slave

ADuM5401 to ADuM5404 master

ADuM520x slave

ADuM5401 to ADuM5404 master

ADuM520x slave

ADuM5000 slave

INSULATION LIFETIME

All insulation structures eventually break down when subjected to

voltage stress over a sufficiently long period. The rate of insulation

degradation is dependent on the characteristics of the voltage

waveform applied across the insulation. In addition to the testing

performed by the regulatory agencies, Analog Devices carries

out an extensive set of evaluations to determine the lifetime

of the insulation structure within the ADuM5401 / ADuM5402 /

ADuM5403 / ADuM5404 devices.

Analog Devices performs accelerated life testing using voltage levels

higher than the rated continuous working voltage. Acceleration

factors for several operating conditions are determined. These

factors allow calculation of the time to failure at the actual working

voltage. The values shown in Table 20 summarize the peak voltage

for 50 years of service life for a bipolar ac operating condition

and the maximum CSA/VDE approved working voltages. In

many cases, the approved working voltage is higher than the

50-year service life voltage. Operation at these high working

voltages can lead to shortened insulation life in some cases.

The insulation lifetime of the ADuM5401 / ADuM5402 /

ADuM5403 / ADuM5404 devices depends on the voltage wave-

form type imposed across the isolation barrier. The i Coupler

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 that the voltage conforms

to either the unipolar ac or dc voltage cases.

Any cross-insulation voltage waveform that does not conform

to Figure 31 or Figure 32 should be treated as a bipolar ac wave-

form and its peak voltage limited to the 50-year lifetime voltage

value listed in Table 20. The voltage presented in Figure 32 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 30. Bipolar AC Waveform

RATED PEAK VOLTAGE

insulation structure degrades at different rates depending on

whether the waveform is bipolar ac, unipolar ac, or dc. Figure 30,

Figure 31, and Figure 32 illustrate these different isolation

0V

Figure 31. DC Waveform

voltage waveforms.

Bipolar ac voltage is the most stringent environment. The goal

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

determines the maximum working voltage recommended by

Analog Devices.

RATED PEAK VOLTAGE

0V

NOTES:

1. THE VOLTAGE IS SHOWN AS SINUSOIDAL FOR ILLUSTRATION

PURPOSES ONLY. IT IS MEANT TO REPRESENT ANY VOLTAGE

WAVEFORM VARYING BETWEEN 0V AND SOME LIMITING VALUE.

THE LIMITING VALUE CAN BE POSITIVE OR NEGATIVE, BUT THE

VOLTAGE CANNOT CROSS 0V.

Figure 32. Unipolar AC Waveform

Rev. C | Page 25 of 28

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