ADUM2200BRWZ 查看數據表（PDF） - Analog Devices

零件编号

产品描述 (功能)

生产厂家

ADUM2200BRWZ

(ADUM2200 / ADUM2201) Dual-Channel Digital Isolators 5 kV

Analog Devices 

ADuM2200/ADuM2201

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 ADuM220x.

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 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 ADuM220x 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 16, Figure 17, and Figure 18 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

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 main-

taining 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 17

or Figure 18 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 10.

Note that the voltage presented in Figure 17 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 16. Bipolar AC Waveform

RATED PEAK VOLTAGE

0V

Figure 17. Unipolar AC Waveform

RATED PEAK VOLTAGE

0V

Figure 18. DC Waveform

Rev. 0 | Page 18 of 20

Share Link: