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WEBENCH-POWER-DESIGNER: How to make capacitor open

Ryoma Ohashi
Expert 3830 points
Part Number: WEBENCH-POWER-DESIGNER
Other Parts Discussed in Thread: LMR33630

Tool/software:

Hi team,

My customer would like to change Cff to open. Could you tell us how to set capacitor as open?

Regards
Ohashi

  • 0
    TI__Intellectual 1960 points

    Hi ,

    Please be informed that LMR33630 comes in a different topology and has multiple family of devices. 

    Could you please follow steps given in attached document and share the design link for above reported issue? 

    This will help us identify the issue faster.

    Appreciate your support.

    Thank you

    Best Regards
    Sateesh A G

    Steps to Share the WEBENCH Design.pdf

  • 0 in reply to Sateesh Goudappanavar
    TI__Expert 3830 points

    Hi Sateesh,

    I will share the WEBENCH design.

    https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=7D4FEACA342B0ED9

    In the datasheet recommendation, CFF is open. The customer would like to simulate with this condition.

     

    Regards
    Ohashi

  • 0 in reply to Ryoma Ohashi
    TI__Expert 5310 points

    Hi Ohashi-San,

    Thanks for sharing the design. We are able to replicate the issue. We are currently debugging to verify if its valid. We will get back with more details by next week.

    Best Regards,

    Umayal

  • 0 in reply to Umayal Ramanathan
    TI__Intellectual 1960 points

    Hi Ohashi-San,

    We apologize for the delay in responding to your query.

    Upon investigation, we identified and resolved the issue. The resolution involved modifications to the component selection process in the backend code, specifically for the Cout and Cff capacitors. However, due to these changes, we need to align with our product lines, and as a result, the status has been marked as “under review.”

    As we approach the year-end holiday season, please note that many of our product experts are currently on vacation. This may lead to delayed responses and could potentially impact our usual turnaround time. We sincerely appreciate your understanding and patience during this period.

    We will keep you updated on any further developments.

    Thank you for your continued support.

    Best regards,
    Sateesh A G

  • +1 in reply to Sateesh Goudappanavar
    TI__Intellectual 1960 points

    Dear Ohashi-san,

    Greetings of the day!

    I hope this message finds you well.

    I am writing to provide an interim update regarding the LMR33630B. We have successfully resolved the issue and consulted our product experts on the matter. Based on their recommendations, we are implementing similar changes and updates across all devices in this family.

    These updates are scheduled to be released during the upcoming code freeze, tentatively planned for January 15, 2024. The changes should reflect by the end of next week.

    In the meantime, please find attached the design report for the LMR33630B, both with and without the Cff capacitor, for your reference
    With Cff Cap.pdf
    Without Cff Cap.pdf

    Thank you for your continued support and understanding.

    Best regards,
    Sateesh A G