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TPS63060: EMC Failure coupled from 5v Buck-Boost mode

Steven Schlax
Prodigy 50 points
Part Number: TPS63060

We recently tested a product utilizing the TPS63060 for a 5v buck-boost converter. We found that the product failed EMC in the range of 30MHz-100MHz with the largest peaks around 50MHz. The failure was noise coupled from the TPS63060 through to IO wires which left the board. What are the typical modes of noise coupling for the TPS63060 and are there any design suggestions to mitigate this? We were planning to put some 0.01uF caps on the input and output power rails, additional ferrites on the IO, and a common mode choke. Are these necessary or will any cause stability issues? Thanks

  • 0
    TI__Expert 7925 points

    Hi Steven,

    The first thing that should be addressed is the source of the noise, so make sure that the PCB layout is following the guidelines from the datasheet:
    - All loops involving the input and output capacitors and the inductor should be as small as possible.
    - There should be plenty of ground vias, if the power ground is changing PCB layers.
    - Putting a small high-frequency ceramic capacitors (100 nF or less, check the impedance curve) as close as possible to the VIN/VOUT pins.
    - Use shielded inductors. 

    If this does not help, then the next step is to add input/output filtering.

    We can also review your PCB layout. Our evaluation module for the TPS63060 is not tested for EMI, and in any case the EMI behavior will largely depend on the specific design. 

    You can find many application notes addressing EMI issues in switch-mode converters if you type "EMI converter" in the search box on ti.com. For example this one is a good starting point:
    http://www.ti.com/lit/an/snva638a/snva638a.pdf

    Best regards,
    Milos

  • 0
    TI__Mastermind 21565 points

    Thank you, Milos. Good suggestions.

    Hi Steveb:

    Please take Milos suggestions firstly. And let us know if anything is unclear or need further support. Thank you~ 

  • 0
    TI__Expert 7925 points

    Hi Steven,

    Were you able to check if the above-mentioned measures helped your design to pass EMC tests?

    Best regards,
    Milos

  • 0
    TI__Expert 7925 points

    Hi Steven,

    We haven’t heard back so we're assuming this resolves your issue. If not, just post a reply below, or create a new thread if the thread has locked due to time-out.

    Thanks and regards,
    Milos