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TPS54340: Webench fails with transient simulations

Carlos Arnau
Prodigy 10 points
Part Number: TPS54340


Hi, 

I want to compare simulations between a bad optimized desging with wrong values for the compensation network with a design optimized. I already do this with other designs using this part with different parameters (i.e 12v output), like this:

But with this design (5V output) every time i want to do a transient simulation this fails.

This is the bad optimized design:

webench.ti.com/.../SDP.cgi

And this is the corrected design:

webench.ti.com/.../SDP.cgi

Simulation fails with both.

It also fails (not every time) with the default calculated values.

  • 0
    TI__Guru 50120 points

    Hello,

    It doesn't look like the WEBENCH exported URL works. 
    Can you please make sure the two files are working so I can take a look at the design for review?

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    Prodigy 10 points

    Woops, sorry.

    This is the bad optimized design:

    https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=8FBC899D3DF3626E

    And this is the corrected design:

    https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=EB06B3A1543402E5

  • 0 in reply to Carlos Arnau
    TI__Guru 50120 points

    Hello Carlos,

    Have you tried to simulate with just your typical Vin condition? 
    I too noticed there was issues with both design simulating for a 22V-33V input range.

    However when I specifically make the Vin_min=Vmin_max = 22V then it was able to simulate

    https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=203D78FD8AF2F7A0

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    Prodigy 10 points

    hi Jimmy,

    In theory simulator is already using only one voltage, not the nominal but Vmax-((Vmax-Vmin)/2) -> 33-((33-22)/2)=27,5v

    In these circuits 24v is the nominal vin.

    I tried what you suggested with a new design, like in other occasions, several attempts simulation seems to do something but ends failing.

    This happen more if I modify components for the comensation network, frequency or coil.

  • 0 in reply to Carlos Arnau
    TI__Guru 50120 points

    Those are interesting results, I must have missed that testing and will retry to recreate it on my end to further help troubelshoot.