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TPS25750: Schematic review

Lillian Liu(SH)
Expert 4620 points
Part Number: TPS25750

Tool/software:

Hi team,

Attachment is designed based on 12V. My current requirement is 15V. Can I continue to use this circuit intact? BUGATTI-S_SCH_DZ800_231221_A00_.pdf

Thanks

Lillian 

  • 0
    TI__Mastermind 37855 points

    Hi Lillian,

    Is this for Power sink only applications?

    If you are adding a 15-V requirement as sink only, you should be fine from the TPS25750 perspective.

    Make sure that the passives seeing that voltage are rated for it, I see some caps rated for 16-V that may need to be resized for 25-V to have decent margin.

    Also, for power sink applications, the VBUS net should have a maximum of 10uF to be compliant. I currently see 19.4uF when ignoring the n/c on VBUS.

    Thanks and Regards,

    Chris

  • 0 in reply to Christopher Lim1
    TI__Expert 4620 points

    Hi Chris,

    Thanks

    Also, for power sink applications, the VBUS net should have a maximum of 10uF to be compliant. I currently see 19.4uF when ignoring the n/c on VBUS.

    =>Noted this. But if the input power has a large ripple and noise, what solution will you  take for this problem without adding capacitor?

    Thanks

    Lillian 

  • 0 in reply to Lillian Liu(SH)
    TI__Mastermind 37855 points

    Hi Lillian,

    This requirement comes from the PD spec and may be related to concerns about inrush current. This requirement is for the capacitance exposed on VBUS on initial connect. After a contract is negotiated, the device will close the power path between VBUS and PPHV, and the spec allows for more capacitance during that state. If you exceed the capacitance, you may risk being non-compliant due to inrush and /or transient requirements.

    Thanks and Regards,

    Chris