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LM5175 Buck Boost Converter Webench Simulation Problem

aguloglu
Prodigy 70 points
Other Parts Discussed in Thread: LM5175

Hi All, 

I used webench to make a LM5175 design for Vin:6-42V Vout 12V@3A. But I got a problem. I simulated with different Vin voltages and I saw a problem…

  • Vin:8V Vout:12V@3A Load ::: Output voltage is ok for this Vin.
  • Vin:10V Vout:4-6V@3A Load ::: Output voltage is NOT ok for this Vin. It should be 12V, but simulation result is 4-6V…
  • Vin:12V Vout:12V@3A Load ::: Output voltage is ok for this Vin. (Bigger Vin voltages are also ok.)

Maybe you can also reproduce the design and test these cases… Is this just a simulation error or design has a vin voltage gap? What can you advise me?

Note: 12V@6A webench design simulation has similar problem. Maybe there is another person who got this problem...

Thanks in advance....

  • 0
    TI__Guru 73545 points

    I will pass this along to the Webench team.

    FD

     

  • Anonymous
    0 Anonymous

    Hi,

    Currently the component calculation done by WEBENCH for this part doesn't work well for all designs. I would suggest, at this point, you design using the Excel Calculator available on the website and use those component values in the PSpice Transient model (also available on website).

    I verified it for your inputs with 600kHz and the design  ( Excel calculator based) works well for 10V VIN and 3A Iout.

    Please try this and if you have any problems, feel free to contact again. I would be happy to help.

    Thanks,

    Ajit

  • 0 in reply to Anonymous
    Prodigy 70 points

    Hi Ajit,

    I downloaded the excel file and psice model file. excel file is ok. But i do not know how to make a test to see if it works ok (instead of webench).

    Can you explain me how you did?

    Thanks

  • 0 in reply to Anonymous
    Prodigy 70 points

    When will be fixed the problem for this part for webench? Is there a work on this issue?

  • Anonymous
    0 Anonymous in reply to aguloglu

    Hi,

    Yes, we are in the final stage of this issue. The part will hopefully be available in  2-3 weeks.

    However, in the meantime, the Pspice model on the web can be used for the simulation if you have access to Orcad Pspice software. We apologize for the delay.

    Regards,

    Ajit

     

  • 0 in reply to Anonymous
    Prodigy 70 points
    Hi,

    I do not have Orcad. But i have Altium Designer. Can Altium Designer Mixed Sim Tool be used...? I tried to use it as importing the orcad design file which I downloaded from TI's web page(to use with AD Mixed Sim Tool). But some simulation file couldn't found after importing.. So i couldn't use it...
    Do you know that can i use Altium Designer for simulation? If so, can you help me about how to do?
    OR Do you have a schematic file(which contains simulation models) of Pspice model for Altium Designer?

    Best Regards
  • Anonymous
    0 Anonymous in reply to aguloglu

    Hi aguloglu,

    The PSpice model on the web is encrypted and cannot be imported into other software. You need to have un-encrypted model.

    To get un-encrypted model , please contact www.ti.com/support OR if you have a direct contact with local TI sales or customer support person, that will also do.  

    Once you get the un-encrypted model, you should be able to import in Altium.

    -Ajit

  • 0 in reply to aguloglu
    TI__Genius 11490 points

    We are implementing the updates.