WEBENCH® Tools/TPS54320: Re-comp and Simulation Bode don't match

PJ,

Those two examples have exactly the same components and conditions? Can you share your Webench design?

Hi John,

Yes both simulation + re-comp are using exactly the same components.

Do you have a private email I can share with?

Thanks
Phil

j(dash)tucker(at)ti(dot)com

Hi John,

I've sent shared this design so you should receive a copy shortly. Please let me know if you need any further information.

Thanks

PJ,

The re-comp gain is about 2 dB higher than the sim gain. That is why the crossover is slightly higher (remember it is log scale so it doesen't take much gain difference to get from 75 kHz to 100 kHz). In any case, the overall result between the two designs are very close if you examine the shape of the gain and phase plots. Let me see if someone from the Webench team can account for the difference

Hi John,

Many thanks for taking a look at this.

I agree the waveform shapes do look very similar but as a result of that slight shift in gain between the two plots, the difference in crossover frequency, gain and phase margin are quite large so it would be great if the Webench team can comment further and provide some guidance over which is correct.

Thanks