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SN6501: SN6501

Part Number: SN6501

Dear TI team,

Could you please tell me the output and input capacitance (Cgs, Cgd and Cds) of MOSFETs used in SN6501 driver? They are not available in the datasheet.

I want to make an isolated bias supply using SN6501 from 5V input to 20V output. Power is 1W. Do you think that snubber RC is necessary in this case to reduce voltage spikes? Or it is really dependent on which kind of isolated transformer that I want to use (leakage inductance)?

Thanks and regards,

  • Hi Van,

    Thank you for posting to E2E! The radiated emissions levels resulting from an SN6501 design are system-dependent, although we don't normally expect any challenges for SN6501 to meet most emissions standards. Placeholders can be included in the PCB layout for a snubber circuit that is only populated if needed.

    From our observations, transformers with lower leakage inductance result in lower emissions, and there can be significant reductions from one transformer part number to another. Please allow me to check with our design team and follow up in 1-2 days regarding the Cgs, Cgd, and Cds specs of SN6501.


    Thank you,
    Manuel Chavez

  • Hi Manuel,

    Thanks a lot! Please let me know the capacitance values if you have any information about it.

    Regards,

  • Hi Van,

    You're welcome! I will follow up by the end of this week regarding the capacitance values.


    Thank you,
    Manuel Chavez

  • Hi Van,

    Thank you for your patience regarding this answer. The SN6501 Coss spec  (Cgd + Cds) is 42.2pF typical. We cannot share Cgs, Cgd, and Cds individually, but since they are internal to the device, Coss is the most relevant for ringing on D1/D2..


    Have a great weekend!


    Respectfully,
    Manuel Chavez