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Need to know reliability of webench designs

Nagendra SV
Intellectual 330 points
Other Parts Discussed in Thread: TPS54620, TPS53316

Hi,

I am trying to design power regulator circuits using Webench online software.

I have used the TPS54620 regulator for generating 12V to 5V power.

I got a circuit in Webench that shows PWRGD kept open (not connected) where as in data sheet, the PWRGD pin has the recommendation of having a pull up resistor connected to voltage less than 5.5V.

Pins like PVIN1, PVIN2 and PS2 are not shown in the webench schematic, where as in the data sheet, these pins are connected. What should we do now? Whether to connect these pins as in the data sheet or leave the pins open as shown in Webench?

I wanted to know how reliable are these circuits that are generated by Webench?

regards,

Nagendra

FTD Automation Pvt. Ltd., Bangalore

  • 0
    TI__Mastermind 26800 points

    Nagendra,

    Thanks for bringing the feedback to us.

    We follow the EVM user's guide (http://www.ti.com/lit/ug/slvu281/slvu281.pdf ) closely to ensure the design schematic and symbol matches up. I agree there is a problem with the PVIN pin is missing in this case and I will work on fixing that. If it was present like in the EVM guide, you would need to connect it to VIN source. Alternative option is to connect it to a different source that you would want to use for power conversion. If you want to use the PWRGD feature, then you need to connect the pull up resistor as mentioned in the datasheet. However, we have followed the EVM user's guide and left the pin open which basically means the PWRGD feature is not being used in the design.

    Please let me know if you have more questions.

    Regards,

    Amod

  • 0 in reply to Amod Vaze
    Intellectual 330 points

    Hi Amod,

    Thanks for your reply. We are designing an FPGA based board by using all the power supply modules from TI.  We have used Webench designs to choose the regulators for generating 5V, 3.3V, 1.5V, 1.2V, 2.5V needed for FPGA and other peripherals on board. We are totally dependent on Webench results and i am now afraid the regulator designs done in Webench should not screw up our entire design. Can you please look into our regulator selections and the circuits that got generated from webench and can you please confirm on the schematics that got generated from Webench? I have attached all the circuitry that i got from Webench.updated power regulators.docx

  • 0 in reply to Nagendra SV
    TI__Mastermind 26800 points
    Nagendra,

    I can request my peers to review the TPS53316 designs in your document and I can review the TPS54620 design. However, please ensure the designs work properly by building test boards and doing your own measurements so you know your system works as expected.
  • 0 in reply to Amod Vaze
    TI__Mastermind 26800 points
    Nagendra,

    The TPS54620 design looks good. Make sure to connect the VIN and PVIN pin together. If you need the power good feature, you could connect a pull up resistor. I have requested my peer to look at TPS53316 designs and once done, either one of us will post the message about it here.
  • 0 in reply to Nagendra SV
    TI__Prodigy 235 points

    Hi Nagendra,

    I've checked all of the TPS53316 designs and I'm concerned about the custom resistors that are showing up in your BOMs. I've ran each design individually and I'm not seeing these custom components. We did recently add some more resistors into the database so you may need to refresh your design to pick them up.

    Please let us know if you need any more help with this.