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DCR010505: EMI issue

Caglar Cihan
Expert 6235 points
Part Number: DCR010505

Dear Team,

My customer experiencing a problem in radiated emission tests with DCR010505. They see repetitive spikes in multiples of 800kHz which is the switching frequency of the device. I am curious about the core used inside the devices. Is it air core transformer, or laminate core?

Any suggestions for EMI issues?

Best Regards,

Caglar

  • 0
    TI__Guru 50120 points

    Hi Caglar,

    Radiated EMI can be caused by a combination of factors (device switching behavior, PCB layout, component selection, etc.).

    Can you provide the radiated EMI data and test conditions during the measurement? Can you provide a PCB layout of your customer's board? Also if possible, does your customer have access to conducted EMI tests? Generally for radiated EMI I've seen significant noise measurements in the MHz range while for conducted EMI it is easier to see kHz range noise from the fundamental switching and harmonics. 

    Input capacitor placement will significantly impact the both conducted and radiated EMI measurements since lowering the high di/dt loop will result in lowered switch noise coupling onto the output and overall lowering of the EMI. Additionally proper grounding and shielding techniques can be implemented to contain these noise. 

    As for the transformer, it is a toroidal enameled transformer, which I assume would be air core, but I will confirm again with the team who previously worked on this. Do note that my reply may be delayed since it is close to holiday season. 

    Regards,

    Jimmy 

  • 0 in reply to Jimmy Hua
    TI__Guru 50120 points

    Hi Caglar,

    In order to consolidate the support, I'll be closing this thread and continue the talk about the transformer core on the Outlook message you sent.

    If you have any further questions on this device, please respond on the outlook message you've sent to keep all discusses on a single thread.

    Regards,

    Jimmy