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ISO7841: Increased test voltage of component

Part Number: ISO7841

Hi,

my previous thread with the same question seems to be deleted, why is that? 

And my question is: 

Is it possible to increase the test voltage of the ISO7841 to 5760 Vrms? The test will be according to EN 61010-1, 1 min a.c. test Vrms . 

Br,

Victor

  • Hi Victor,

    I apologize for the apparent thread deletion! My response yesterday posted multiple times and in an attempt to delete the duplicates I may have deleted the original post. We are looking to restore this thread publicly if possible, and the response will be accessible here:



    In the meantime, thank you for sharing the test voltage profile! We do expect the isolation barrier to withstand 5760Vrms for 60 seconds and for a total >27.8 hours over its lifetime as shown in the Time Dependent Dielectric Breakdown curve in the ISO7841 datasheet and below:



    My apologies for the thread deletion - I appreciate this post following up with us!



    Thank you for posting on E2E,
    Manuel Chavez

  • Hi Manuel,

    thank you for your answer!

    That is somewhat good news. I have to ask the certification agency if that information is usable as an official statement. I'm a bit worried they will only look at the official test voltage the component is qualified for (5700 Vrms), which is sad because it's only a 60 Vrms difference. How have you achieved your operating lifetime graph above? Is it extrapolated data? 

    Br,

    Victor

  • Hi Victor,

    You're welcome! If the certification agency will test the devices, this might not be a concern, however TI is careful with the parameters on datasheets because margin is part of the reliability we design for and some standards also require it.

    Is there a particular reason why the additional 60Vrms is necessary for your system?


    Yes, the graph above is extrapolated from consistent test results, and margin is added to estimate the 1ppm fail rate. For context, 63% fail rate is used in most failure estimations.


    Thank you for your time,
    Manuel Chavez

  • Hi Manuel, 

    Thank you for your answer! I spoke to the certification agency and they said that they should be able to test the devices with a higher voltage, so if you think that the component will handle it then it should not be a problem! 

    Yes, the 5760 Vrms comes from our system voltage together with the mains voltage connection. 

    Br,

    Victor