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TPS25750EVM: EVM combo for 60W evaluation

Kazuki Itoh
Genius 11130 points
Part Number: TPS25750EVM
Other Parts Discussed in Thread: BQ25731, TPS25750, , USB-PD-CHG-EVM-01

Hi team,

My customer is trying to design a USB PD power bank which has 60W (20V/3A) source capability.

Could you please recommend TI EVM combo to evaluate TPS25750 + BQ25731 for the power bank design?

For instance, should Power Duo (Sink) be good choice to emulate 60W sink for TPS25750EVM?

Is there any other additional EVM(s) I should prepare? 

Regards,

Itoh

  • 0
    TI__Mastermind 33791 points

    Itoh,

    The TPS25750D EVM and Power Duo Source/Sink provides a good basis for your customer.

    Is your customer planning to use the type C port for charging the battery?  There are some system level considerations for the BQ25731+ TPS25750 that need to be addressed for battery charging.  The TPS25750 does not execute the charge termination function  This will have to be done with an external MCU.  

    You have the right set of boards to get started, but please do reach out with more system level details once you move further into the design process.

    Regards,

    Chuck

  • 0 in reply to Chuck Branch
    TI__Genius 11130 points

    Hi Chuck-san,

    The charging requirement is TBD. Probably >20000mAh 2-3s battery will be used, so they should use type-C port for charging.

    It also has type-A port for the output.

    Please see preliminary electric requirement:

    【Type-C PD output】20V/3A(60W)、15V/3A、12V/3A、9V/3A、5V/3A
    【Type-C PD input】20V/3A(60W)、15V/3A、12V/3A、9V/3A、5V/3A
    【Type-A input】5V/3A

    【USB ports】Type-C×1、Type-A×1

    Could you please recommend right TI MCU for this requirement?

    Is any additional EVM required?

    Also, if you have detailed information about the termination current function, please share us.

    We'd appreciate something like app note if you have one.

    Regards,

    Itoh

  • 0 in reply to Kazuki Itoh
    TI__Mastermind 33791 points

    Itoh-san,

    I cannot really provide a recommendation for the MCU for this type of system.  I suggest reaching out to our MSP430 team.  The requirements for the MCU are very difficult to define without very in-depth system knowledge.

    It sounds to me like you would be best served using the USB-PD-CHG-EVM-01 that has the TPS25750 plus a 2-3 cell battery charger on it already.  

    The Type A port does not require a PD controller, but will need to be able to negotiate the appropriate power for the Type A port.  You do not have a description of how power will be multiplexed between the type C port and the Type A port.  This may also require intervention by the MCU.  We do not have a design that has both a type C and Type A power input path that I am aware of.

    Regards,

    Chuck

  • 0 in reply to Chuck Branch
    TI__Genius 11130 points

    Hi Chuck.

    OK, I'll work with MSP430 team.

    Why do you recommend USB-PD-CHG-EVM-01 even though 60W sink capability is mandatory?

    You say we don't have description of how power will be multiplexed between the type C port and the Type A port.

    Do you mean TI doesn't have solution, or you expect the customer to develop SW by themselves?

    How should I find the right combination of devices to realize the power bank?

    Regards,

    Itoh

  • +1 in reply to Kazuki Itoh
    TI__Mastermind 33791 points

    Itoh-san,

    The USB-PD-CHG-EVM-01 integrates the battery charge with the TPS25750, so it is a good basis to begin planning a system.  We do not have an evm that provides a power mux and related firmware to support selecting between the type C port and the Type A port as well as a charger.

    We do not provide a software solution to control the power switch and manage the charger when utilizing the type A port as a power source.

    I order to build a power brick with this solution, the customer would need to develop the following:

    1. An analog power mux between the Type C and Type A port. 
      1. The selection can be controlled directly from the TPS25750 where the DFP/UFP settings can be selected with GPIO
    2. They will have to write firmware to manage the charger when the type A port is used to source the voltage/current to the charger.
      1. The Battery charger team can help with these requirements.

    Regards,

    Chuck