ADUM3190 查看數據表（PDF） - Analog Devices

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ADUM3190

High Stability Isolated Error Amplifier

Analog Devices 

Data Sheet

be affected only by extremely large currents operating at a high

frequency very close to the component. For the 1 MHz example,

a 0.7 kA current must be placed 5 mm away from the ADuM3190

to affect the operation of the device.

1000

DISTANCE = 1m

100

10

DISTANCE = 100mm

1

DISTANCE = 5mm

0.1

0.01

1k

10k

100k

1M

10M

MAGNETIC FIELD FREQUENCY (Hz)

100M

Figure 28. Maximum Allowable Current for Various

Current-to-ADuM3190 Spacings

INSULATION LIFETIME

All insulation structures eventually break down when subjected

to voltage stress over a sufficiently long period. The rate of insu-

lation 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 ADuM3190.

Analog Devices performs accelerated life testing using voltage

levels higher than the rated continuous working voltage. Accel-

eration 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 8 summarize the peak voltage for

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

ADuM3190

The ADuM3190 insulation lifetime depends on the voltage wave-

form 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 29,

Figure 30, and Figure 31 illustrate these different isolation

voltage waveforms.

A bipolar ac voltage environment is the worst case for the iCoupler

products yet meets the 50-year operating lifetime recommended

by Analog Devices for maximum working voltage. In the case

of unipolar ac or dc voltage, the stress on the insulation is sig-

nificantly lower. This allows operation at higher working voltages

while still achieving a 50-year service life. Treat any cross-insulation

voltage waveform that does not conform to Figure 30 or Figure 31

as a bipolar ac waveform, and limit its peak voltage to the 50-year

lifetime voltage value listed in Table 8.

Note that the voltage presented in Figure 30 is shown as sinu-

soidal 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 29. Bipolar AC Waveform

RATED PEAK VOLTAGE

0V

Figure 30. Unipolar AC Waveform

RATED PEAK VOLTAGE

0V

Figure 31. DC Waveform

Rev. 0 | Page 15 of 16

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