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WEBENCH-POWER-DESIGNER: Difference in results of Switchpro and Webench

Madhu Sharma
Expert 2915 points
Part Number: WEBENCH-POWER-DESIGNER
Other Parts Discussed in Thread: TPS53355, SWITCHERPRO

Hi,

I am using TPS53355 for powering core voltage of keystone II soc ( 0.95V to 1.05V).

For implementing this, Switchpro suggests to use just four 100uF decaps at the output, but Webench suggests to use 22 ( 11 when temp is 30 deg. c).

Please find below images for more information.

Please let me know what might be the reason for this difference and which one can be considered for the design.

Regards,

Madhu.

  • 0
    TI__Guru**** 191445 points
    Switcherpro is no longer supported and has not had any updates in many years. I would not use that tool. That being said, 22 x 100 uF does seem like really a lot. I'll move this to the webench forum to see what they say about that large capacitance.
  • 0 in reply to JohnTucker
    Expert 2915 points
    Hi,

    Can anyone please answer this query?

    Thanks & Regards,
    Madhu
  • 0 in reply to Madhu Sharma
    Genius 4910 points
    Hi John, Madhu,

    The value of capacitance calculated by the circuit calculator is justifiable. At the given input-output conditions the capacitance turns out to be 2200uF. In the advanced options(drop down list) you can select ceramic/electrolytic capacitors. Please change it to electrolytic for more efficient design in terms of quantity of output capacitors.

    For ceramic capacitors 2200uF is a very high value and may not exist practically. We have planned to add few 470uF and 680uF(Maximum) ceramic capacitors into our database.

    Regards,
    Atul K