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Original question:

TPS25730: Minimum Voltage Configuration Meaning/Actions

TPS25730: What does device do when minimum (operating) current / voltage / power are not met?

Cameron Wutzke
Expert 4267 points

Part Number: TPS25730

Question in title, I believe the device defaults to 5V @ 500mA, if unable to meet minimum voltage/ current /power operating value? 

 

Overall, my goal is to request as much power as possible. If I am unable to source 20V @ 3A , request the next largest PDO. Curious if this is default behavior

 

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  • 0
    TI__Mastermind 34182 points

    Hi Cameron, 

    Thank you for reaching out!

    The TPS25730 will request the maximum power available from the Source within the acceptable range set by ADCINx and assert the capability mismatch bit. 

    It will not default to 5V/500mA. 

    Best Regards, 

    Aya Khedr 

  • 0 in reply to Aya Khedr
    TI__Expert 4267 points

    Thanks Aya!

    So If I request 15V @ 3A, and source is unable to supply it, what happens next?

  • 0 in reply to Cameron Wutzke
    TI__Mastermind 36856 points

    Hi Cameron, 

    TPS25730 will only request the maximum power the source is able to provide. For example, if TPS25730 is configured to have maximum voltage/current of 20V/5A and the source only has PDO capability of up to 15V/3A, then TPS25730 will only request 15V/3A in this scenario and assert the capability mismatch bit in its Request message to indicate the sink system (TPS25730) requires more power. 

    The sink (TPS25730) will never request more than what the source is able to provide. Let us know if you have any further questions or concerns! 

    Thanks and Regards,

    Raymond Lin

  • 0 in reply to Raymond Lin
    TI__Expert 4267 points
    Raymond Lin said:
    The sink (TPS25730) will never request more than what the source is able to provide. Let us know if you have any further questions or concerns! 

    Awesome thanks! So the TPS25730 will work like:
    1) request 20V 5A

    2) fail... source not enough power possible

    3) request 15V 3A [lower power level]

    4) fail... source not enough power possible

    5) request [lower power level]

    6) success! 

    Looks like the [lower power level] PDOs are programmed into the TPS25730, configurable by customer 

  • 0 in reply to Cameron Wutzke
    TI__Mastermind 34182 points

    Hi Cameron, 

    The Source offers its capabilities first, and the sink requests from the PDOs offered by the Source. Hence, it will never request 20V/5A if the Source is not offering that power level. 

    See attached PD logs for example. In the attached logs, the Source is 30W capable (20V/1.5A max) and the TPS25730 is configured as 20V min, 20V max, 5A operating and 5A maximum current. 

    Also, please check out the TI-PD-Analyzer Tool used to monitor and log PD communication data. 

     https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/196/TPS25730_5F00_CapabilityMismatch_5F00_Example.pda

    Best Regards, 

    Aya Khedr