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TPSM831D31: Need power module solution to replace MPM3695-100

Paul Yeh
Genius 13605 points
Part Number: TPSM831D31

Hi team,

My customer use 3pcs MPM3695-100 power module in parallel in their project.

And currently they would like to search 2nd source to replace MPS solution.

I search our product portfolio and find TPSM831D31 is similar but seems not suitable.

The customer's specification is

Vin=12V; Vout=0.75V/270A with PMBUS interface.

The MPM3695-100 is 100A rating, so customer use 3pcs MPM3695 in parallel to support this power rating.

So please advise does TI have similar solution to compete?

Thanks

  • 0
    TI__Expert 8960 points

    Hello Paul,

    Does the TI device need to just be able to power that rail, or does it need to be p2p with the MPM part?

    Thanks,

    Travis

  • 0 in reply to Travis Williams
    TI__Genius 13605 points

    Travis,

    Customer didn't ask p2p solution. So we just provide similar function solution should be opportunity for design in possible?

    Thanks 

  • 0 in reply to Paul Yeh
    TI__Expert 8960 points

    Hello Paul,

    The TPSM831D31 can handle the 270A by paralleling two of them, as long as there is some amount of DCLL to ensure current sharing.

    The 120A rail & the 40A rail can be safely paralleled to provide a single 160A rail, as long as there is DCLL. You would then parallel those two rails with the two rails from the second TPSM831D31, to get a single 320A rail.

    Thanks,

    Travis

  • 0 in reply to Travis Williams
    TI__Genius 13605 points

    Travis,

    Could you advise what is DCLL? and how to implement it in detail.

    Based on the material you provided then I can share with customer.

    Thanks

  • 0 in reply to Paul Yeh
    TI__Expert 8960 points

    Paul,

    DCLL stands for "DC Load Line". It makes the VR reduce the output voltage based on the output current, simulating an output resistance but without the efficiency drop of a real output resistance. While it has several uses, in this case the use would be ensuring current sharing. It can be set in Fusion GUI by connecting the TPSM831D31 to a computer via the USB-to-GPIO adapter. It can also be set via PMBus command.

    DCLL is also known as droop.

    You would want to scale the DCLL such that the 40A rails have 3x the DCLL of the 120A rails. For example:

    TPSM831D31 # 1 : Rail 1 (120A): 0.5mΩ

    TPSM831D31 # 1 : Rail 2 (40A): 1.5mΩ

    TPSM831D31 # 2 : Rail 1 (120A): 0.5mΩ

    TPSM831D31 # 2 : Rail 2 (40A): 1.5mΩ

    This would force proper current sharing such that no rail is overloaded at 270A out. The combine DCLL is all rail DCLL's in parallel, which comes out to 187uΩ in this case. This would cause a total output voltage drop of 50mV at max load.

    You increase DCLL to make current sharing more accurate at the cost of higher drop at max load, or decrease DCLL to reduce output drop at the cost of less precise current sharing. I'd recommend starting with these values and then tuning it when you have a real board available.

    Thanks,

    Travis