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  • TI Thinks Resolved

ISOW7842: ISOW7842 Radiated emission failure

Part Number: ISOW7842

Hi I am using ISOW7842 in my design  and due to which my product is failing radiated emission test. There is very high emission at around 66MHz.

Can someone help me out to reduce the radiation level  to pass the product.

  • In reply to Alex Ballantyne:

    Hi Dan,

    I have results from our pre-compliance tests to Class B.

    Adding ferrite beads to all the signal lines on both sides of ISOW7842 made no significant difference and we still fail Class B by about 3dB at 65MHz.

    Adding two areas of screen above and below the ISOW7842 does make a difference and brings us to a pass but with zero margin.

    These screens are about 50x50mm and are not grounded or connected together.

    I will need a further 3dB improvement at 65MHz to achieve a secure pass, any suggestions will be very welcome.

    Alex.

  • In reply to Alex Ballantyne:

    Results:
    Adding beads to the ISOW signal lines (in addition to the power lines) made no measurable difference.

    Screening did though. So, if we need to pass Class B, we will need to implement a screen.

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