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TPS25751: Control the PP_HV switch from I2C

Adrien BESSERVE
Prodigy 30 points
Part Number: TPS25751

Tool/software:

Hello support team,

We are design a board that can be supplied either from a USB PD source or a standard power source.

If the source is compatible with PD, then we intend to use TPS25751D to negotiate a 20V/5A profile.

If the source is just a standard power supply with no PD support, then the TPS25751D won't be able to negotiate anything. In that case we still wish to close its  PP_HV switch if the voltage is in a correct range that we monitor by an other component. I took a look in the TPS25751 Technical Reference Manual but I couldn't find if it is possible to control PP_HV switch with I2C registers from MCU.

Could you please tell us if this is possible ? Otherwise we will just add electronics to bypass TPS25751D.

Best regards,

Adrien

  • 0
    TI__Mastermind 34736 points

    Hi Adrien, 

    Adrien BESSERVE said:
    If the source is just a standard power supply with no PD support, then the TPS25751D won't be able to negotiate anything. In that case we still wish to close its  PP_HV switch if the voltage is in a correct range that we monitor by an other component. I took a look in the TPS25751 Technical Reference Manual but I couldn't find if it is possible to control PP_HV switch with I2C registers from MCU.

    What is the "correct range" you're referring to here? By USB Type-C/PD standards, the standard power range for non-PD connection is maximum 5V/3A. TPS25751 is able to support sourcing and sinking 5V when connected to a legacy (non-PD) device and doesn't require alternatives. If the range you're referring to is outside of the vSafe5V range (4.75V-5.5V) such as 9V or 12V then external electronics will then be required to bypass TPS25751D. 

    Thanks and Regards,

    Raymond Lin

  • 0 in reply to Raymond Lin
    Prodigy 30 points

    Ok thank you, I was expecting to pass between 12V to 20V (5A) through internal PP_HV switch, despite no USB PD négociation, by controlling thing switch by software.

  • 0 in reply to Adrien BESSERVE
    TI__Mastermind 34736 points

    Hi Adrien,

    12V-20V without USB PD negotiation is not compliant with USB Type-C/PD specification. TPS25751 is designed to follow the specification so scenarios such as hot plug 12V-20V is treated as a faulty connection and PPHV will not be enabled. You'll need to bypass the PD controller for this scenario. 

    Let us know if you have any further questions or concerns! 

    Thanks and Regards,

    Raymond Lin