adum5200 Analog Devices, Inc., adum5200 Datasheet - Page 22

• Manufacturer Part Number: adum5200
• Description: Dual-channel Isolators With Integrated Dc/dc Converter
• Manufacturer: Analog Devices, Inc.

ADuM5200/5201/5202
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 10 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 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 ADuM520x 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 22, Figure 23, and Figure 24 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 ADI’s recommended maximum working voltage.
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 10 can be applied while
maintaining the 50-year minimum lifetime provided the voltage
conforms to either the unipolar ac or dc voltage cases. Any cross
insulation voltage waveform that does not conform to Figure
23
its peak voltage should be limited to the 50 year lifetime voltage
value listed in Table 10.
1
or Figure 24 should be treated as a bipolar ac waveform and
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1
The voltage presented in Figure 23 is shown as sinusoidal for illustration
purposes only. It is meant to represent any voltage waveform varying
between 0 and some limiting value. The limiting value can be positive or
negative, but the voltage cannot cross 0V.
RATED PEAK VOLTAGE
RATED PEAK VOLTAGE
RATED PEAK VOLTAGE
0V
0V
0V
Figure 23. Unipolar AC Waveform
Figure 22. Bipolar AC Waveform
Figure 24. DC Waveform
Preliminary Technical Data