EVAL-ADUM540XEBZ Analog Devices Inc, EVAL-ADUM540XEBZ Datasheet - Page 21

• Manufacturer Part Number: EVAL-ADUM540XEBZ
• Description: BOARD EVAL FOR ADUM540x
• Manufacturer: Analog Devices Inc

Specifications of EVAL-ADUM540XEBZ

• Main Purpose: Interface, Digital Isolator
• Embedded: No
• Utilized Ic / Part: ADuM540x, 520x, 500x, 130x, 131x, 140x, 141x, 240x, 330x, 340x
• Primary Attributes: Pads for 16-SOP iCoupler® Isolators, Support for Signal Wrap Back
• Secondary Attributes: Places for BNC Connectors for 50 Ohm Signals, Support for isoPower
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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. Analog Devices conducts
an extensive set of evaluations to determine the lifetime of
the insulation structure within the ADuM5401/ADuM5402/
ADuM5403/ADuM5404.
Accelerated life testing is performed using voltage levels higher
than the rated continuous working voltage. Acceleration factors
for several operating conditions are determined, allowing calcu-
lation of the time to failure at the working voltage of interest. The
values shown in Table 9 summarize the peak voltages for 50 years
of service life in several operating conditions. In many cases, the
working voltage approved by agency testing is higher than the
50-year service life voltage. Operation at working voltages higher
than the service life voltage listed leads to premature insulation
failure.
The insulation lifetime of the ADuM5401/ADuM5402/
ADuM5403/ADuM5404 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 28, Figure 29,
and Figure 30 illustrate these different isolation voltage waveforms.
Bipolar ac voltage is the most stringent environment. A 50-year
operating lifetime under the bipolar ac condition determines
the Analog Devices 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 9 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 29 or Figure 30
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 9.
Rev. A | Page 21 of 24
ADuM5401/ADuM5402/ADuM5403/ADuM5404
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.
RATED PEAK VOLTAGE
RATED PEAK VOLTAGE
RATED PEAK VOLTAGE
0V
0V
0V
Figure 30. Unipolar AC Waveform
Figure 28. Bipolar AC Waveform
Figure 29. DC Waveform