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TUSB2077A: schematic review

Shu-Cheng LIN
Guru 11785 points
Part Number: TUSB2077A
Other Parts Discussed in Thread: TPS2044

Hi Sirs,

Sorry to bother you.

Could you help to double confirm TUSB2077 schematic as attachment.

Thanks!!

  • 0
    TI__Guru 60865 points
    Hi Shu-Cheng,

    Please have the customer check the TPS2044 datasheet. I believe the OC lines need individual pullups. Also, there are separate power controls for each port, but they all feed the same +VBUS rail? What is the reason for this? Also, there is a lot of bulk capacitance on the VBUS rail and it may cause long switching times.

    Per the USB specifications, a USB device should not have the pullup on DP enabled when VBUS is not present. For a closed system, this is not an issue, but a fet controlled by VBUS can be added if needed.

    Regards,
    JMMN
  • 0 in reply to JMMN
    Guru 11785 points

    Hi Sirs,

    Thanks for your reply.

    Our update schematic as below

    Independent OC, +VBUS, please let us know if still have others suggest.

    Thanks!!

  • 0 in reply to Shu-Cheng LIN
    TI__Guru 60865 points
    Shu-Cheng,

    It looks like the issues have been addressed.

    Regards,
    JMMN