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WEBENCH® Tools/LMZ31710: Accuracy of Output Ripple Results

Mark Guastaferro
Genius 11645 points
Part Number: LMZ31710

Tool/software: WEBENCH® Design Tools

How accurate are the output voltage ripple results found in Webench or TINA compared to actual hardware?

Customer needs to design a supply using the LMZ31710 with low output voltage ripple.  Webench and TINA design results show the output ripple to be 10 mV p-p. How confident should we be that he can achieve this with hardware? 

I looked at App Note slva630a, and it  looks like TINA results align with analytic calculations. 

  • 0
    TI__Mastermind 26810 points

    Hi Mark,

    WEBENCH calculations are aligned with the app note equations which match up with SPICE so you can expect high accuracy given all conditions (actual capacitance and ESR, layout is good, design is stable and has no subharmonic oscillations, etc.) are equal. Note that ESL is not accounted for in the analytical equations and also that the equations hold true only in CCM so DCM conditions will not be as accurate compared to measured data.

    Regards,

    Amod