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LM5160A not allowing 2A output

Other Parts Discussed in Thread: LM5160A, LM5160-Q1, LM5160

Hi Team,

I am trying to run a WEBENCH simulation for the LM5160A. In the datasheet, this part is spec'd to run at 2A:

However, in WEBENCH, I am limited to 1.5A:

This poses and issue when trying to convince the customer this part can handle 2A output. Please let me know if the part is not capable of running at 2A or if the WEBENCH is mistaken.

Thank you!

Jared

  • Hi Jared,

    Thank for pointing this out ill take a look at it for you. It appears that the current limit from the LM5160-Q1 got applied to this part. Let me check with the device owner and make sure that this was the case. I will get back to you with an answer shortly.


    Regards

    -Jason

  • Hi Jason,

    Any updates on this? Customer is waiting to evaluate our device.

    Thank you,
    Jared
  • Hi Jared,

    I was able to track down the engineer who placed this device into Webench. Turns out this was a simple mistake as you expected. It has been resolved and the changes will be visible by Thursday of this week.

    Regards
    -Jason
  • Hi Jason,

    I just tried running Webench with the LM5160A at 2A and the design still did not let me proceed:

    It says "parts not found" and I am not sure what this means. Can you please help?

    Best regards,

    Jared

  • Jared,

    I'm not able to replicate this issue anymore.

    I was able to successfully create an LM5160A design in WEBENCH with the following inputs:  Vin=12V, Vout=5V, Iout=2A.

    How are you entering into WEBENCH?  Are you trying to create the design from the LM5160A product folder? Or are you entering the design requirements from the  WEBENCH panel on TI.com?  Any information on the steps you are taking would help us track down the cause of this issue. 

    Regards,
    Jonathan Arzadon
    Applications Engineer
    WEBENCH Design Center
    Texas Instruments

  • Hi Jonathan,

    I am starting the design from the product folder page. I am also selecting isolated output:

    Do you think that the isolated output selection could have an effect on the results?

    thank you,

    Jared

  • Jared,

    Yes, the isolated output selection is what's preventing WEBENCH from creating a design. If you reduce the output current, WEBENCH should be able to create a design for you. As a quick test, I was able to create a design when I reduced Iout to 1.5A.


    Regards,
    Jonathan
  • Hi Jonathan,

    Is that a limitation of the device or a mistake in Webench? If it is a limitation of the device, why does the isolated output have an effect on the output current?

    Best regards,
    Jared
  • Hi Jared,

    It was a limitation set up initially in WEBENCH. When the device was first implemented into WEBENCH a couple of years ago, the max load of the device was 1.5A. Since then, the device was spec'd to go up to 2A, but we did not catch that until recently when you brought it to our attention (thank you for that).

    There is a little more updating on our side in WEBENCH that needs to be done, but the device should be able to handle a 2A load (assuming that there is no load on the primary side, too). It'll take me a day or two to get this updated, but I will let you know when the update has been released so that you can create your design in WEBENCH.

    I apologize for any issues this may have caused you. Let me know if you have any other questions or concerns or if there's anything I can do to help support you while this is being worked on.

    Regards,
    Jonathan
  • Hi Jared,

    I was able to resolve this issue, and the fix should be pushed out early next week.

    Just a quick note about a 2A isolated LM5160 Fly-Buck design: Depending on the primary inductance and the desired ripple current, your design will operate near the current limit of the device (which is 2.5A typical and 2.125A minimum). Although WEBENCH will create a design for you with your specifications, it's something to be aware of if/when a board is built and tested.

    If you are in need of a design right away, I can create the design for you and share the design report for you. Let me know if this is something you would like, or if you have any other questions or concerns.

    Regards,
    Jonathan
  • Hi Jonathan,

    Thank you for your top notch support. I can wait until the fix is pushed out, thank you for the offer though!

    Have a great day,

    Jared

  • Hi Jonathan,

    I just went to test the LM5160A with my condition above for an isolated output and I am still not able to see the design. Do you know if the update has been released yet?

    Thank you,

    Jared

  • Hi Jared,

    Sorry about that.  I thought we had a software release scheduled for earlier in the week to get the fix out, but it was scheduled for today.  You should be able to create your design in WEBENCH this afternoon.

    Best  regards,
    Jonathan