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TPA3251: Radiated Electromagnetic Field Immunity Test

Guru 11170 points
Part Number: TPA3251

Hello E2E,

Our customer is testing the radiated electromagnetic field immunity for developed product.
In the immunity frequency at from 650MHz to 750MHz and from 950MHz to 1GHz, system board emitted a resonance sound.

I attached the schematic and PCB pattern files.
Please see the files and give us your advice.

We need your help.

Regards,
ACGUY

4ch_amp_bd_01_2chx2_ver_01.pdfSJ25-1017-01-GBR.pdf

  • Hi ACGUY,
    We are looking into this, Justin will get back to you later.
  • Hi ACGUY,

    Well it seems like you have the pads for a choke, have you done testing with the choke installed? It seems you have it DNP on your schematic.

    One of the first things I would do is to change the PWM switching frequency to see if that has any effect on the failing signals you see. From there we can try and asses what we can do about the radiation from the output path.

    Justin
  • Thank you for reply.

    >> Well it seems like you have the pads for a choke, have you done testing with the choke installed? It seems you have it DNP on your schematic.

    I will confirm to customer.

    >> One of the first things I would do is to change the PWM switching frequency to see if that has any effect on the failing signals you see.

    That's great advice.

    Thanks,
    ACGUY