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TPSM831D31: How to build a project in Fusion Digital Power Designer?

fs wang
Prodigy 40 points
Part Number: TPSM831D31
Other Parts Discussed in Thread: TPS53681,

Tool/software:

Hi 

I can't find TPSM831D31 or TPS53681 in Fusion Digital Power Designer, how do I configure this part? Please advise.

The software version is 7.10.1

Thanks

  • 0
    Prodigy 40 points

    I didn't say that currently we don't have TPSM831D31, we just want to build an offline project first

  • 0
    Prodigy 40 points

    I saw the below reply in other thread, so If someone can help me to build the configuration with eval board first, I need two rails: 0.84V@120A, 0.94V@40A

    "Fusion GUI does not support the TPSM831D31 offline. However, once the live TPSM831D31 is connected then GUI detects it and you can program the device."

  • 0 in reply to fs wang
    TI__Expert 5735 points

    Hi Fushen,

    Confirming that both TPSM831D31 and TPS53681 are unavailable in the offline mode of Fusion. 

    Configuration of multiphase controllers and modules will necessitate knowledge of the end-system schematic and layout, as well as the delivery specification of the load. 

    Kind regards,
    Nick Z

  • 0 in reply to Nick Zahabizadeh
    Prodigy 40 points

    Hi Nick,

    Can we do that with this way: You help me build a draft project with TPS53861, and send me the project file, so I can edit it to meet my requirement.

    Thanks.

  • 0 in reply to fs wang
    TI__Guru 65860 points

    Wang

    Please order TPSM831D31 module from https://www.ti.com/tool/TPSM831D31EVM 

     and you can launch the Fusion GUI to connect to generate the configuration file or modify.

    Regards

    Yihe

  • 0 in reply to yihe
    Prodigy 40 points

    Hi Yihe,

    If there is a guide can show me how to build the the configuration based on TPSM831D31?

  • 0 in reply to fs wang
    TI__Guru 65860 points

    HI

    The EVM guide is the only available doc for this EVM which covers how to configure the part.

    You may try this to have a overview of the GUI. 

    https://www.ti.com/lit/pdf/slvub51 

    Regards

    Yihe 

  • 0 in reply to yihe
    Prodigy 40 points

    Hi Yihe,

    I found https://www.ti.com/lit/ug/sluubl0/sluubl0.pdf, looks like this one can cover TPS53681.

    I have question with following parts in Fusion UI:

    1. fsw, the default is 600khz, should I change this part, what difference this can cause?

    2. vout droop, will there be a problem to set it to zero?

    3. the mode setting page, if this page can keep default?

    I have configured the part to .xml file, can I send it to you for review?

  • 0 in reply to fs wang
    TI__Expert 5735 points

    Hi Fushen, 

    1. Changing the switching frequency (FSW) will modify how fast the controller will respond to load changes. Setting FSW value too low will lead to poor transient load performance, while making FSW too high will lead to controller instability. The default 600kHz is a good starting point.
      1. For more information read section 7.3 in TPSM831D31 datasheet or section 7.3 in TPS53681 datasheet.  
    2. No problem with setting Vout droop to zero.
      1. For more information read section 7.3.2 in TPSM831D31 datasheet or section 7.3.1.1 in TPS53681 datasheet.  
    3. This will depend on the compute device (CPU / FPGA / etc) that you are powering. Intel requires different operational specifications given the generation and type of processor, so it's up to checking with the requirements of your compute device to know which settings this will need to be. While testing the EVM, default setting is fine. 

    Just to confirm: Have you ordered TPSM831D31EVM or TPS53681EVM-002? Otherwise there is little use of supporting the configuration file. 

    Kind regards,
    Nick Z

  • 0 in reply to Nick Zahabizadeh
    Prodigy 40 points

    Hi Nick,

    Thanks for the answer, I'm also studying TPS53681 now, I will check if we should buy the eval board before we have prototype devices build.

  • 0 in reply to Nick Zahabizadeh
    Prodigy 40 points

    Hi Nick, I have bought the TPSM831D31EVM, now I have already configured the board, but there is no output, the jumper on J8 and J9 was removed. Could you please help me check this problem?

  • 0 in reply to fs wang
    Prodigy 40 points

    Hi Nick,

    I found the cause, it's the dongle pulled down the enable pins of TPSM831D31.

    but I have other problems, the margin high and margin low values are set to zero, after I click "Store config to NVM"

    I have attached the config file, need your help to review it.

    Thanks!

    TPSM831D31 @ PMBus Address 105d Project-0506.xml

  • 0 in reply to fs wang
    TI__Expert 5735 points

    Hi Fushen, 

    Glad to hear than you received the board and have been learning how to use it. Make sure to read through the User Guide to learn how to operate the device and board: https://www.ti.com/lit/ug/snau240/snau240.pdf  

    To answer your question, make sure that margining is enabled in the operation section. 

    To comment on the enable pin, if you would like to bypass the enable pin, you can set the On/Off config option to "0x1B Operation Only" to enable voltage regulation from the Fusion GUI. 

    Nothing is wrong with your configuration file, depending on your application you may need to change settings in "transients" to pass transient requirements, but that will all depend on the specification of the CPU/load you are regulating.  

    Kind regards,
    Nick Z

  • 0 in reply to Nick Zahabizadeh
    Prodigy 40 points

    Hi Nick,

    The problem is still about margin high and margin low setting, like i set margin high to 0.86 and margin low to 0.82 for 0.84v rail, after I click "store to NVM", margin low and margin high are reset to ZERO, I have tried several time, the result is same.

    Thanks.

  • 0 in reply to fs wang
    TI__Expert 5735 points

    Hi Fushen, 

    A couple tips: 

    1. After completing "write to NVM", make sure to power-cycle TPSM831D31. 3.3V only needs to be low for a few hundred milliseconds. Make sure that the power supply completely discharges when you turn it off and back on, since the 3.3V rail requires very little current and in some situations the power supply capacitors will keep the 3.3V rail high for several seconds after PSU shutdown. 
    2. Sometimes Fusion GUI software can be a little buggy. After writing to NVM and power-cycling the module, close the Fusion software and reopen it to refresh all data being read in from the module. 

    If those don't work, could you share the log when you write the data and store to NVM? 

    Kind regards,
    Nick Z

  • 0 in reply to Nick Zahabizadeh
    Prodigy 40 points

    Hi Nick, 

    You can see the log of successfully store to the NVM, but as I mentioned before, after the power cycle, and I reconnect the eval board, the margin high low settings are lost.

  • 0 in reply to fs wang
    TI__Expert 5735 points

    Hi Fushen, 

    Please verify closing and reopening the Fusion GUI software after storing to NVM. 

    I'm working on finding an EVM here to test in the lab to try recreating your issue. 

    Kind regards,
    Nick Z