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TPS23881: Dual power supplies

Brian Barnes
Prodigy 20 points
Part Number: TPS23881
Other Parts Discussed in Thread: TIDA-050026-23881, MSP430F5234

Tool/software:

How are dual simultaneous power supplies attached to the TPS23881 controller for doubling the available power?

  • 0
    TI__Genius 15275 points

    Hi Brian, 

    Please refer to TIDA-050026-23881 for dual power supply design guide. You can reference the schematics for this design, which is a system level design using our FirmPSE solution (black box FW based on MSPM0 MCU).

    Regards,

    Brandon

  • 0 in reply to Brandon Beader
    Prodigy 20 points

    Thank you for the reply.  The schematic show an ORing circuit and states 'USE J6/J7 OR J2/J4 FOR MODULAR INPUT SUPPLIES WITH CURRENT SHARING'.  This is exactly what I am looking for and wanting to understand how to implement.  How do I implement the current sharing between two parallel  power supplies for 54V at 3.25 A total (54V 1.75A each).  

  • 0 in reply to Brian Barnes
    TI__Genius 15275 points

    Hi Brian,

    The current sharing which you see in the design is more related to the system level power budget. Using this design in "sharing" mode adds the two power budgets together therefore you system power budget monitored by the system MCU combines the limits of both power supples. This is more of a passive power sharing where the outputs are OR'd together then MCU controls the max draw on both power supplies combined, not individually.

    If you wanted to do a more active power sharing and limit the power supplies currents, you can do this also but would need an OR'ing controller with an active current limit being set. If not, I would recommend using an MCU and limiting your power budget to reflect both power supplies max draw.

    The FW for how to implement this is TI proprietary in our black box FW solution for system level PoE designs, therefore I can not share with you the MCU source code, however I would recommend using our FirmPSE solution which is what you see with the design TIDA-050026-23881. This is based with our MSP430F5234 and is a black box FW solution which interfaces easily with our GUI to create your system level design! 

    Take a look at this user's guide for how our system FW solution works and let me know if this would be of interest!

    Regards,

    Brandon