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Original question:

TPS65100-Q1: Schematics Review Needs

TPS65100: TPS65100 schematic check

Luan Bottcher
Prodigy 15 points
Part Number: TPS65100

Hi there,

Could you please check my schematic? I could not get any voltage but AVDD from it. 

  • 0
    TI__Mastermind 18550 points

    Hello,

    I reviewed the schematics and noticed couple of possible issues with it.

    1-   Since linear regulator is not being used, input pin ENR should be tied to GND and not to 5V.

    2-   The target VGH voltage will not be achievable with positive charge pump doubler mode and I suggest to use the charge pump in trippler mode by installing C17 and removing R13 from the board.

    When you say that you get AVDD voltage,  is it at the correct voltage level all the time or does it come on briefly and then even AVDD collapses? If item 2 above was the cause, I would expect AVDD to come up briefly and then the whole device to shutdown afterwards because for TPS65100, if all rails are not in regulation, the whole device shuts down. Please make mods 1 and 2 to see if this resolves the issue.

    Kind Regards,

    Liaqat

  • 0 in reply to Liaqat Khan
    Prodigy 15 points

    Dear Liaqat, nice to meet you !

    I appreciate your time answering my issues.

    1- ok, I will review it.

    2-ok, it will be changed.

    The 9v6 voltage at AVDD is found at all moment, even after minutes. 

    I will check the prepositions made and let this forum know the result.

    Best regards,

  • 0 in reply to Luan Bottcher
    TI__Mastermind 18550 points

    Thank you and I look forward to the results after the mods.

    Kind Regards,

    Liaqat