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SN6501-Q1: EMI test report

Ethan Liu
Intellectual 1445 points
Part Number: SN6501-Q1
Other Parts Discussed in Thread: SN6501, SN6505A

Tool/software:

Hi team,

Could you pls send me the EMI test report of SN6501-Q1? Thanks!

Best regards!

Ethan

  • 0
    TI__Guru 55815 points

    Hi Ethan,

    Thank you for reaching out. Please find below the radiated emissions test report for SN6501, thanks.

    SN6501_Radiated_Emissions.pdf


    Regards,
    Koteshwar Rao

  • 0 in reply to Koteshwar Rao
    TI__Intellectual 1445 points

    Hi koteshwar,

    Thanks for your materials.

    Is the EMI report tested by our EVM? It seems that our EVM does not have any EMI equipment.

    If not, can you explain what circuit boards and EMI facilities are in the EMI report?

    Best regards!

    Ethan

  • 0 in reply to Ethan Liu
    TI__Guru 55815 points

    Hi Ethan,

    Since the EVM for SN6501 has multiple designs (5 units and 5 transformers), the tests were done on an internal test PCB. This PCB is similar to the schematic in EVM and has no EMI filters or other components. Therefore, SN6501 passes the emissions requirements without any need for EMI filters.

    Although the results look good on internal test PCB, the emissions results can be different on customer PCB if the PCB size is much larger or there are many cables connected to it. To keep emissions to minimal, customer might have to incorporate EMI filters at the input/output terminals of customer's end-product.

    It is also recommended that customer follows the guidelines provided in the below App Note to keep the emissions low. They may not need all these suggestions and might pass their emissions requirements without any of these changes. They either first build a simple PCB, test emissions and go ahead with final design or build the design with all the guidelines and then test for emissions.

    How to Reduce Emissions in Push-Pull Isolated Power Supplies (Rev. A)


    Regards,
    Koteshwar Rao

  • 0 in reply to Koteshwar Rao
    TI__Intellectual 1445 points

    Hi Koteshwar,

    Thanks for your detailed reply. We test the SN6501EVM, when the input voltage is 3V or 4V, the no-load current is 3mA. However, when input voltage is 5V, the no-load current is 10mA. Do you know how to decrease the no-load current in 5Vin?

    Ethan

  • 0 in reply to Ethan Liu
    TI__Guru 55815 points

    Hi Ethan,

    The no load current of SN6501 based solution is expected current. This is a total current consumed due to switching losses and not the current into SN6501 itself. The only way to minimize switching losses is to reduce the number of times it is switching, i.e., to reduce the switching frequency.

    Alternatively, customer can consider using SN6505A which switches at much lower switching frequency (160kHz). Thanks.


    Regards,
    Koteshwar Rao