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WEBENCH® Tools/LM3691: Looking for Vout min and Vout max, i.e the historical feature that used to exist in Webench

M.A.M
Expert 8455 points
Part Number: LM3691
Other Parts Discussed in Thread: TLV431

Tool/software: WEBENCH® Design Tools

Hi,

My customer wants to study the Vout tolerance but cannot find Vout min/max anymore.

How to get this info from the tool?

Thanks!

/M.A.M

  • 0
    TI__Guru*** 142860 points
    You can always find this critical information in the device D/S.
  • 0 in reply to Chris Glaser
    TI__Expert 8455 points
    Chris,

    - Please have a look at the designers situation below and comment on feasibility to add this functionality in Webench?
    Thanks. /M.A.M

    "The problem is: I need a 3.3V or 5 V supply with high accuracy so I can use the voltage as a reference for the A/D in a microcontroller.
    It is not possible to set this demand for accuracy in the selections parameters of your WEBench – so I have to open the datasheet of every device suggested by WEBench to check if its accurate enough for my application.
    Adding the output accuracy as a selection parameter in WEBench will help a lot and shouldn’t be a complex task to implement."
  • 0 in reply to M.A.M
    TI__Guru*** 142860 points
    Do I understand that you need a 3.3V or 5V reference for an ADC? What input voltage do you have to create this supply from? Do you want to use this rail for anything else, besides the reference input?

    A dedicated reference IC, like TLV431, is much better suited to this task.
  • 0 in reply to Chris Glaser
    TI__Expert 8455 points
    Chris,
    He need to supply a microcontroller with this voltage, but *also* use the supply voltage as basis for the reference voltage to its internal ADC. (Saving the cost of the TLV431).
    So the question reverts back to one concerning Webench. Your thoughts?
    Thanks. /M.A.M
  • 0 in reply to M.A.M
    TI__Guru*** 142860 points
    I have alerted the Webench team to this request (I am not in that team), but it may not be as simple as you think. Various ICs have different specifications for accuracy--some at various temperatures or temperature ranges, some at only one temperature or input voltage, etc. It is not easy to put a single number into a tool.

    Regardless of what Webench can do, I can help you find the right device for your needs. What Vin, Vout, and Iout do you need? What accuracy do you need?
  • 0 in reply to Chris Glaser
    TI__Expert 8455 points
    Chris,
    Webench cannot always resolve all aspects, for instance BOM cost is sometimes "N/A" when browsing for solutions.
    But if the Vout min/max could be included, at least some precision devices could display/allow search on these parameters.
    The designer comments
    "I think the Webench selection feature could be implemented as Vo_low and Vo_High limits. Then it’s up to the user to set his/her max boundaries. I heard that this feature previously was included in Webench."

    Please forward to Webench team as well.
    Thanks. /M.A.M