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TPS25730: TPS25730

Jacob Bitton
Prodigy 70 points
Part Number: TPS25730

Tool/software:

Assuming I configure the port to deliver 20V/5A using resistors connected to ADCIN1 to ADCIN4, but the laptop can deliver only 5V/5A as Type-C does, what will be the output voltage and current in this case?

Regards

  • 0
    TI__Mastermind 18225 points

    Hi Jacob,

    The TPS25730 would accept the highest available contract in this case so it would be up to 25W.

    Thank you,

    Kevin

  • 0 in reply to Kevin Kosta
    Prodigy 70 points

    In this case can I use the MIS_CAP signal to switch different resistors driver from 20V/5A which is the max power available from Thunderbolt port to 5V/3A which is standard power from Type-C port? 

  • 0 in reply to Jacob Bitton
    TI__Mastermind 31780 points

    Hi

    Please see the mis_cap assertion criteria below:

    The TPS25730 PD controller will toggle the capabilities mismatch pin if the advertised capabilities of the Source do not meet the minimum power required by the TPS25730.

    The minimum power is calculated from the minimum voltage configuration and the operating current chosen.

    For example, let's say we set the minimum voltage to 9-V, the maximum voltage to 20-V and the operating and max current to 5-A. This would set the minimum power to 9-V*5-A = 45-W.

    If you attach a wall adapter that only sources 5V/3A and 9V/3A, the TPS25730 will negotiate the max contract available that meets it's capabilities. In this case, the 9V/3A contract is negotiated. Because the Source can only provide a max power of 27-W, and the TPS25730 minimum power is 45-W, the capabilities mismatch pin will toggle.

    Now let's attach a wall adapter that only sources 5V/3A, 9V/3A, and 15V/3A. The TPS25730 will negotiate the max contract available that meets it's capabilities, which happens to be the 15-V/3-A contract. This time, the source can provide 45-W (15-V*3-A) which meets the minimum power of 45-W. Because the source can provide enough power, the capabilities mismatch pin will not toggle.

    CAP_MIS or not will be determined by you ADCIN setting and it will be toggling, but yes you can use the signal to switch to different resistors drivers.

    Regards