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need solution for high power 80A 1v multi-phase down converter

Ami Oz
Prodigy 135 points
Other Parts Discussed in Thread: TPS40132, TPS40090, TPS40140

Hello

I'm looking for a solution with the following specs:

input 5 to 12v

output 1v 80A max , non-isolated, synced to external 500khz  to 1Mhz clock.

design should be simple as possible with small footprint.

I was thinking about the TPS4090, using 3 phases or even 4 phases of TI's power-stage modules (to keep things simple and smaller)

Other option might be using two TPS40132 and then adding power blocks.

Can someone please advise what is the recommended topology and TI/National power devices for this design.

I couldn't find any TI which solves and simulates this converter.

Thanks in advance

Ami Oz

  • 0
    Prodigy 135 points

    Hi

    had a typo, it is TPS40090 and not TPS4090

  • 0 in reply to Ami Oz
    TI__Mastermind 25546 points

    TPS40090 is the right device for this application.

    normally a 4ph @ 400-500KHz switching frequency is targetted for 80-100A solution.

    Vincenzo

  • 0 in reply to Vincenzo Pizzolante
    TI__Mastermind 49470 points

    Hi Ami Oz,

    I would recommend TPS40140 for your application. TPS40140 is a dual phase stackable controller and could be synchronized to external clock. Please review the datasheet and EVM user's guide for performance. I attached the reference design schematic here for your reference. This is 12Vin, 1.2V/100A.

    Thanks,

    Nancy

    8585.TPS40140EVM_4phase schematic.pdf

  • 0 in reply to Nancy Zhang
    Prodigy 135 points

    Hello Nancy

    Thanks for the answer.

    Customer is trying to avoid a discreet design and on other hand wants to have high efficiency by using at least 3 phases.

    is it possible to use the integrated power stage with the 40090 ?

    are there any reference designs which contain the power stage with TPS40xxx controllers?

    Also : relatively to analog power controller: is a solution of digital power with power train can be smaller or same size?

    are there any TI tools which might aid with this kind of design .

     

    Thanks in advance for the support.

    Ami Oz

    EBV Israel

  • 0 in reply to Ami Oz
    TI__Mastermind 49470 points

    Hi Ami Oz,

    I am not familiar with TPS40090,  power stage MOSFET and digital power. I hope other engineers could answer your question.

    Thanks,

    Nancy

  • 0 in reply to Ami Oz
    TI__Genius 17240 points

    Hi Ami,

    I have some experience with TPS40090 and integrated power stage. Some issues I hope you could be aware of.

    (1) Input offset variance at zero current is +-3.5mV. For inductor with sub-miliohm DCR, this offset can be tranlated into over +-3.5A phase curent difference.

    (2) Minimum controllable on-time is designed as 100ns (not production tested). For 1MHz, 12V to 1V application, the on-time is only 83ns. Pulse-skipping may occur and lead to higher output ripple.

    For your application, I would recommend TPS40140 for better current sharing and the ability to extend to higher switching frequency.

    Regards,

    Na