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TPS25850-Q1: USB_IF certification issue

Yishan Chen
Intellectual 1710 points
Part Number: TPS25850-Q1

Tool/software:

Hi Team,

Customer meet some USB_IF certification issue in our TPS25850. Could you please give them some insight about how to solve these fail item?

Schematic:

Thank you,

Yishan Chen

  • 0
    TI__Genius 11125 points

    Hi Yishan,

    Looking at the schematic, what is the purpose of R7 between D+ and D-?  Also, R2 = 36 kOhm means current limit is only 896 mA.  Is this the intention?

    In addition to R2 consideration above, SPT1 can be improved by shorting VSET to GND.  This will enable the cable compensation feature.  They can also increase the capacitance on the SENSE side of the power inductor.  For 2.1 MHz fSW, datasheet recommendation is 3x22uF.

    TD.4.2.1 sounds like a VIF error.  Just change the VIF to indicate VCONN is supported.

    I'm not sure about TD4.2.1 and TD4.2.6.  Assuming no fault conditions are present, Rp advertisement should be present on both CC pins.

    Regards,
    Eric