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SN6507: XSN6507DGQR

Maor Matityahu
Intellectual 590 points
Part Number: SN6507

Hi,

I am using the XSN6507DGQR IC for push pull converter from 12V to 50V . 3W output.

my 12V is coming from long cable to the circuit, i have placed 50uF capacitors to the 12V.

Which filter are you suggest to use?

ferrite bead? common mode? inductor?

Thank you

  • 0
    Intellectual 590 points

    The swithing frequency is 150kHz

  • 0 in reply to Maor Matityahu
    TI__Guru 55055 points

    Hi Maor,

    Thanks for reaching out.

    Since SN6507 is an open-loop isolated power supply, its output regulation is going to be directly dependent on the input supply voltage regulation. Hence, I recommend using sufficient input bulk capacitance (~100µF) to keep the supply stable. Additionally, you can leave provision for an inductor in between two decoupling caps to form a π-filter. The inductor can be optional and you can later decide to use it based on how noisy you see the 12V supply to be.

    Let me know if you have any further questions, thanks.


    Regards,
    Koteshwar Rao

  • 0 in reply to Koteshwar Rao
    Intellectual 590 points

    Hi Rao,

    Do you mean that π-filter and than 100uH caps?

    In the π-filter what value do you think the capacitors needed to be?

    One more general question, in push pull converter what is the maximum peak current on the mosfets?

    Thank you

  • 0 in reply to Maor Matityahu
    Intellectual 590 points

    And in the π-filter you mean inductor or ferrite bead?

  • 0 in reply to Maor Matityahu
    TI__Guru 55055 points

    Hi Maor,

    The 100µF is the total bulk capacitance that would be needed for maintaining stable supply voltage. When a π-filter is used, the 100µF can be part of this filter itself and an additional 100µF capacitor is not needed. You can keep both capacitors values as C = 47µF and choose L based on desired cut-off frequency depending upon the noise frequency observed. 100nH of inductor should usually be good enough.

    You can ask customer keep PCB footprint to all 3 components of the filter, test it with and without L and then decide if L is really needed or not for their application. Thanks.


    Regards,
    Koteshwar Rao