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AMC1300: AMC1300 ISOLATION

Michele Visentin
Prodigy 20 points
Part Number: AMC1300
Other Parts Discussed in Thread: AMC1204, ISO7842

Hi

I'am using the AMC1300 as current sensor in a high voltage power supply. The working voltage is about 2KV, but, it can rise to 3.5KV for some seconds. In the slyy063.pdf , figure n.3, is showed the life time versus the applied voltage: i read about 1e6 seconds  (i.e. 11 days) with 3.5KV. My question is: the life time is intended as sum of all period with voltage of 3.5KV or, when i turn off the power, the life time start from 0 each time? In other words: can i apply 3.5KV for 11 days, turn off the device, and reapply 3.5KV for 11 days again without failure?

Thanks

Michele Visentin

  • 0
    TI__Guru**** 181811 points

    Hi Michelle,

    Welcome to our e2e forum!  The AMC1300 data  shown in Figure 3 is assuming a continuously applied voltage over the isolation barrier.  We did not try testing to the 23rd hour of day 10 and then re-start to see if the clock resets.  Long exposures to higher voltage will decrease the life expectancy of the isolation barrier, it won't completely re-set the clock, but you also won't be starting from where you left off.  Give me a couple days and let me see if I can find more detail for you.

  • 0 in reply to Tom Hendrick
    TI__Guru**** 181811 points

    Hi Michelle,

    Sorry for the delay here.  I found the material I was looking for but it's not exactly the same situation as what you are looking at here.  That test was using our AMC1204 device with a working voltage of 1.25kV for 8-16 hours per day followed by 780V for the remainder of the 24-hour period.  The conservative life expectancy in that case was 25 years.

    I also took another look at the SLYY063 document - the device used to extrapolate the expected lifetime of Figure 3 in that document was the ISO7842.  The AMC1300 uses an updated technology for the isolation barrier.  Figure 4 in the AMC1300 datasheet shows the 1 PPM failure rate which can give you an idea of what to expect in your application - at 3.5kV in this case, you are looking at ~1E+8 versus 1E+6.