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INA381-Q1: RI Test Data

Jeffrey Chung1
Genius 3320 points
Part Number: INA381-Q1
Other Parts Discussed in Thread: INA381

Hi Team,

According to the customer's RI test result, there was a failure at 1200MHz to 1400MHz due to the fluctuation of current sensing value. [1200MHz to 1400MHz, PM(PRR=300Hz, PD=3us), Level 2 300V/m, Class A]

Is there the RI test data of INA381-Q1? and please let me know how to resolve or improve this issue.

Regards,

Jeffrey

  • 0
    TI__Mastermind 34260 points

    Hi Jeffrey,

    Are you asking about radiation immunity test? If so, we don’t have this data for INA381-q1.

    Has it been confirmed that the failure is due to INA381? Does the test pass if INA381 is removed?

    Maybe a small cap of a few pF with low parasitic R/L can be connected between the output pin and ground. It should help improve the result, but I'm not sure in reality how effective it is going to be.

    Regards, Guang

  • 0 in reply to Guang Zhou
    Genius 3320 points

    Hi Guang,

    Are you asking about radiation immunity test? Yes, it is.

    Has it been confirmed that the failure is due to INA381? Yes. Does the test pass if INA381 is removed? Current sensing function can't be confirmed if it is removed.

    The customer had already added the capacitors(33pF or 57pF) between output and ground, but this issue had not resolved completely even through it was some improvements, and the fluctuation range was changed from 0A~25A to 4A~22A. (normal current sensing value=13.5A)

    Are there any other check points or your recommendation on this issue?

    Regards,

    Jeffrey

  • 0 in reply to Jeffrey Chung1
    TI__Mastermind 34260 points

    Hi Jeffrey,

    Is measurement taken at the output pin with cap added? It is a good idea to make sure the interference is not coming from another path, component, or direction.

    Since there are some improvements, I suggest continue the search in this direction in the meantime. If not already, try some high-quality capacitors.

    A good source of information is often the testing facility staff (I assume customer is using a lab), because they deal with this type of issue often. 

    Regards, Guang

  • 0 in reply to Guang Zhou
    Genius 3320 points

    Hi Guang,

    Thanks for your kind response. Let me check with the customer on your comment.

    Regards,

    Jeffrey