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TPS82675: TPS82675

user5273610
Prodigy 50 points
Part Number: TPS82675
Other Parts Discussed in Thread: TPS8268120

How do we eliminate Frequency noise at 5MHz?

Thank you

  • 0
    TI__Guru*** 145560 points

    Hi User,

    This is a switching DC/DC converter which operates at a 5 MHz frequency.  It is not possible to eliminate this frequency entirely.

    You can add a ferrite bead on the input and/or output to block this frequency from other circuits.  What issue is this frequency causing in your system?

    We also have the TPS8268120 in the same size package.

  • 0 in reply to Chris Glaser
    Prodigy 50 points

    Hi Chris,

    Thank you for your reply.

    The attached picture is the result of our measurement and our design.

    Is it possible to minimize noise without changing the current layout?

    Thank you

    Julie

  • 0 in reply to user5273610
    TI__Guru*** 145560 points

    Hi Julie,

    Thank you for sharing your data.

    What is the x-axis and its units?  I don't see 5 MHz on the graph.

    As well, there are peaks that are higher than the area in the red box.  Is it just the frequency range that is important to stay out of?

    Where and how was that measured?  Is it the actual signal or its radiation that is measured?

    What is the load current?