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WEBENCH® Tools: Webench design required

Sahil Berde
Intellectual 730 points

Other Parts Discussed in Thread: TLV61048, TPS61372

Tool/software: WEBENCH® Design Tools

Hello,

Can you suggest me IC part number and if possibly a Webench design for the following parameters

VIn minimum: 3.3V

Vin maximum: 3.67V

Iout maximum: 120mA

Vout: 12V

Max ambient temperature: 85C

Efficiency required: above 90% at max load.

Only ceramic caps(X7R,C0G/NP0 only....if both not possible than X5R)

shielded inductors only

Max component height should be less than 2.1mm.

BOM count should be minimum.

  • 0
    TI__Expert 3320 points

    Hi Sahol,

    Thanks for contacting us. We can always use Webench power designer for these requirements. Please follow below steps 

    1. Click on below link and add your input conditions. After adding your inputs, click on view designs to get possible solutions.

    https://webench.ti.com/power-designer/switching-regulator?powerSupply=0

     

     2. Inside power designer you will find many filters (on left hand side E.g. Efficiency) to choose from. This will help to narrow down the search.

    3. After narrowing down the search you can open designs from possible solutions. Here you can customize BOM components as required (select from alternate BOM). E.g. I clicked on inductor from one of the design. It has option to choose from alternate parts. Here you can choose from required inductor (For capacitors follow the same). 

    Hope this helps.

    Best Regards,

    Bhushan 

     

  • 0 in reply to Bhushan Waghmare
    Intellectual 730 points

    Thank you for your reply.

    Based on my previous experience after designing from Webench i was not able to achieve the efficiency shown by Webench as the models used in Webench were not updated. 

    Hence asking for the above parameters which design would be having corrected models so that the efficiency required would be achievable.

  • 0 in reply to Bhushan Waghmare
    Intellectual 730 points

    I have attached Webench design as per my requirements. Can you confirm by looking into the models selected whether they are updated are not?

    This will let me know that after building the circuit i would get the same efficiency as shown in Webench report

    12V 120mA 85C LM2735YQ.pdf

  • 0 in reply to Sahil Berde
    TI__Expert 5920 points

    Hi Sahol,

    Sorry for your past experience with Webench.

    Webench models are modelled based on actual measured data with an acceptable accuracy of +/-3% to 5%.

    Webench efficiency is modelled considering the losses at various components.
    while calculating the efficiency  there are few assumptions, example we don't model core losses in inductor. We try to match Webench efficiency with actual bench efficiency with a difference of +/-3% to 5%.

    Hence there is a possibility of having difference between Webench efficiency and actual board efficiency.


    From the condition mentioned above we see the requirement for higher efficiency at light load, at light load its difficult to predict and model the efficiency very accurately due to the assumptions mentioned above.

    Hence we might see bigger difference at light load between bench and  Webench efficiency.

    we see only way to accurately predict efficiency is using the EVM board.

    Here we will not be able to help you with product suggestion for your input condition with required efficiency, we need recommendation of product expert on

    this. I have moved your post to the product expert for the help.

    Thanks and Regards,

    Umayal

  • 0 in reply to Sahil Berde
    TI__Mastermind 46905 points

    Hi Sahol,

    I would suggest two option TLV61048 and TPS61372. the efficiency should meet your requirement.

    the TLV61048 is low cost solution, and the switching frequency can be set to optimize efficiency or solution size.

    and TPS61372 will has the smallest solution size.