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PTH12000W: ARRIA 10 POWER TREE MODIFICATION FROM ABB TO TI

ARM arm
Expert 2630 points
Part Number: PTH12000W
Other Parts Discussed in Thread: TPSM84624

Hi,

Due to Non-availability of components form ABB (recommended by our customer), we want to switch to PTH12000W series to replace PVX006A0X3-SRZ and PVX003A0X3-SRZ as we need the development faster.

We will be powering1.8 VCCIO, 1.8 VCCIO_HPS, VCCERAM, DDR3L, DDR4 VCCIO, 2.5 VCCIO and power supply of other circuits .

I am unable to find much difference between the two except may be some lower [performance in terms of ripple rejection and ripple voltages.

I would request the learned community and experts to guide us through this last moment changes and to make us aware if we are making some mistake here in this selection.

One point that lures me towards TI is that soldering of these is much easier as they are modules with through hole lines. I hope cooling them is not difficult. We have fans inside the chassis.

Kindly revert at earliest.

  • +1
    TI__Mastermind 18370 points

    Hello,

    The two major differences between the modules you are currently using and PTH12000W are:

    1) Vout in PTH12000W can not go lower than 1.2V (Instead of 0.6V in PVX modules ). 
         Please note: PTH12000L can regulate Vout between 0.8V and 1.8V

    2) PTH12000W works well with input voltages above 4.5V (Instead of 3V in PVX modules)

    In general, a well designed surface mount module should be able to transfer its heat to the mother board better over a through hole module.
    But I am not familiar enough with the PVX modules to make a good comparison between these modules. The fact that you have fans definitely helps.


    TI also offers other modules such as TPSM84624 that are a closer replacement to the PVX modules, but some of these are not through hole modules.

    Hope this makes sense.

    Regards,

    Yitzhak Bolurian

  • 0 in reply to Yitzhak Bolurian
    Expert 2630 points

    Hi

    Thanks for your reply and insight.

    does this mean that PTH modules may not transfer heat that well?

    Actually I am choosing this module because stock is available.

    Any words on ripple etc..

  • +1 in reply to ARM arm
    TI__Mastermind 18370 points

    Hi,

    Heat transfers in many ways, the transfer via conduction may not be as good. But the fan will help to compensate for this.
    Some of our customers actually prefer that the heat does not entirely transfer to the mother board.

    The typical output ripples seem to be comparable.
    There might be other differences, a thorough comparison needs quite some time investment.

    Regards,

    Yitzhak

  • 0 in reply to Yitzhak Bolurian
    Expert 2630 points

    Hi Yitzhak,

    Thanks for taking this up and replying again.

    Maybe rather than comparing the two parts, can you please suggest whether the TI part elected by us is suitable for high end ARRIA 10 FPGA. Some thoughts there.

  • 0 in reply to ARM arm
    TI__Mastermind 18370 points

    Hi,

    I really do not want to be the judge, as I do not know your specific system requirements.
    I have noticed that you already realize that the transient response is not as good as in some more recent TI modules.

    If you will ask me a more specific (efficiency, load transient, size, ...) question, I will be glad to provide you with the right answer.

    Hope this makes sense.

    Regards,

    Yitzhak

  • 0 in reply to Yitzhak Bolurian
    Expert 2630 points

    Hi,

    Thanks for the revert. Question was in general as to whether these are aimed at such type of FPGAs with  very fast switching applications? But then I understand your point and will be more specific.

    Okay so for transient response, I am already adding a few 47uF ceramic and 680uF Tantalum at the output for better transient response here. We have DDR3L and DDR4 (@ 2400) should be the most demanding loads. Then we have SFP+, SGMII and RGMII loads on around 6 such separate modules. I hope that such large caps with ESR at around 25 mOHM should be okay. Your thoughts on these?

    Any simulation tools available like ABB for testing these modules for transient response? 

    Since I have a large AC to DC Converter so I am not much bothered about efficiency which will be 85% lowest as I see. Size is also not much of a factor here.

    Finally, the Most recent modules suggested by you and on TI website as well are very good but again out of stock. Else, we would have straightaway added them in the design based on recommendation and study. 

  • 0
    TI__Mastermind 18370 points

    Hi,

    PTH12000 was designed about 20 years ago.
    Unfortunately at that time having simulation tools was not a requirement.
    TI provides tools for the vast majority of its converters, but unfortunately not for this module.

    I do regret that I can not be more specific than that.

    Regards,

    Yitzhak