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Original question:

BQ24192: EMI Issue

BQ24192: Getting the EMI peak

Pratik Panchal1
Prodigy 160 points
Part Number: BQ24192

Hello Team,

We have used the BQ24192 in our product.

Currently, we are doing the PTCRB test where we are failing the TIS test. We are suspecting that the battery charger might be a culprit here.

I have measured the switching frequency and found that there is ringing in the falling edge.

Here I am attaching the schematic and layout snapshot.

Sometimes I am also getting this type of switching waveforms.

Here is the EMI peak I am getting over the BQ24192.

let us know the suggestion to improve the EMI results.

  • 0
    TI__Guru* 95525 points

    Hello Pratik,

    The short drop in voltage before rising edge and after falling edge is a characteristic of synchronous switching converters, it is expected behavior.

    The original thread you linked gives all the same suggestions I would give to you. Have you followed the guidance there already?

    Sincerely,

    Wyatt Keller

  • 0
    Prodigy 160 points

    Hello Wyatt,

    Yes, we have followed all the suggestions but the results are not improved not much.

    Request you to give another suggestion.

  • 0 in reply to Pratik Panchal1
    TI__Guru* 95525 points

    Hello Pratik,

    The suggestions given should help eliminate EMI, you should have a metal shield around the charger along with a shielded inductor. Via stitching and shielding along with close decoupling capacitors can also help. As mentioned in the other post there is no way to eliminate EMI around the switching frequency.

    The other mode you took a capture of should be the PFM mode of the charger.

    Sincerely,

    Wyatt Keller