• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 63 subscribers
  • Views 116 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS25730: TPS25730D

Winnie Huang
Prodigy 70 points
Part Number: TPS25730

Tool/software:

Hi,

Please help me to review the circuit schematic TYPC PD CHARGER 线路图Review (2).pdf

PD IC : TPS25730D

The fuction of the design: is to negotiate 20V with Type C adapter, 5A function for local battery charging and system operation

  • 0
    TI__Mastermind 37855 points

    Hi Winnie,

    Here is the feedback on the schematic:

    Comments:

    • The TPS25730 does not support DP alt mode, and will not negotiate DP alt mode.
    • Is R252 not populated? If it is populated as a 191k resistor, then ADCIN2 will not be at setting 7.
    • Understand by tying the open drain outputs to the VIN3V3 rail, they will not be pulled up if the TPS25730 is in a dead battery state and the 3.3V rail is not being generated in dead battery.
    • Understand that the PD controller will negotiate any SPR voltage (5,9,15,20) but will trigger caps mismatch if below the minimum power level (min voltage * operating current) which is 100-W (20*5).

    Must Fix:

    • I2Ct SDA and SCL should be pulled up to LDO3V3 through a resistor even when unused.
    • Why are the CC lines being attached to the SBU pins of the Type-C port?

    Recommended:

    • We recommend 10nF caps for each VBUS pin on the type-C connector. In addition, you should have all of the VBUS pins connected. A9 and B4 are floating?

    Thanks and Regards,

    Chris

  • 0 in reply to Christopher Lim1
    Prodigy 70 points

    Hi Chris,

    Thanks for the specific recommendation, Here is the feedback as following, and please review the schematic as attched that has been fixed.

    Comments:

    • The TPS25730 does not support DP alt mode, and will not negotiate DP alt mode.-->OK，In this application, it will only be used to negotiate the voltage.
    • Is R252 not populated? If it is populated as a 191k resistor, then ADCIN2 will not be at setting 7.-->on the schematic，all components marked with an "x" before "Value" indicate that they are not to be installed.
    • Understand by tying the open drain outputs to the VIN3V3 rail, they will not be pulled up if the TPS25730 is in a dead battery state and the 3.3V rail is not being generated in dead battery.-->OK
    • Understand that the PD controller will negotiate any SPR voltage (5,9,15,20) but will trigger caps mismatch if below the minimum power level (min voltage * operating current) which is 100-W (20*5).-->OK

    Must Fix:

    • I2Ct SDA and SCL should be pulled up to LDO3V3 through a resistor even when unused.-->In the data sheet, it is described that if the I2C is not used, it can be connected to ground, but is it still recommended to pull it up to VIN_3V3?
      .
    • Why are the CC lines being attached to the SBU pins of the Type-C port?-->This is a mistake and will be fixed.

    Recommended:

    • We recommend 10nF caps for each VBUS pin on the type-C connector. In addition, you should have all of the VBUS pins connected. A9 and B4 are floating?-->This is a mistake and will be fixed.
    19. USB-C,PD.pdf
  • 0 in reply to Winnie Huang
    TI__Mastermind 37855 points

    Hi Winnie,

    Winnie Huang said:
    In the data sheet, it is described that if the I2C is not used, it can be connected to ground, but is it still recommended to pull it up to VIN_3V3?

    Both should be fine, but we prefer having them connected to LDO3V3 in case they are needed for debug purposes. We do recommend LDO3V3, not VIN_3V3. Feel free to ground them if you do not want them for potential debug as they are not necessary.

    It looks like the recommendations and issues pointed out were fixed.

    Thanks and Regards,

    Chris