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TPS54531: AC simulation model for TPS54531

Viktorija Cecil
Mastermind 18491 points
Part Number: TPS54531
Other Parts Discussed in Thread: TPS54335A, TPS54331

Team, 

Does Webench offer AC Analysis capability for TPS54531?

If not, do we have a TINA model for AC Analysis for the TPS54531? (I only see a transient model).. 

Thanks

Viktorija

 

  • 0
    Prodigy 250 points
    OP here ... It looks like Webench only supports Type 2A compensation. I have a wide range of operation and need to look at multiple Vin, Vout and Iout combinations. I think my design will benefit from Type 3A compensation.

    I'm assuming the TINA transient model will support various time-domain simulations? I have some strange ones, not your typical start-up/step-response conditions I'd like to model.
  • 0
    TI__Expert 4035 points

    Hi Viktorija,

    On Webench design screen, you could use the SIM Export function to create the TINA model for this part...

    BRs,

    Ryan

  • 0 in reply to Ryan Hu (BSR-MV)
    Prodigy 250 points
    Are you certain this will generate a model for AC Analysis for simulating the gain/phase? I've seen this referred to as the "AVERAGE" model. I believe the only model that's exported from WEBENCH is the "TRANSIENT" model.

    I took the TPS54335 AVERAGE Model and copied over the source driver with the "injection capacitor and inductor". The AC Analysis runs, but the I don't get an output ... or more accurately, the output is the first order output of the Cout and Rload. The SMPS doesn't operate to generate a voltage for measuring the AC effects.

    Here's a link to the TPS54335A tools/software page with the models I'm referring to: www.ti.com/.../toolssoftware
  • 0 in reply to rojo-mojo
    TI__Expert 4035 points
    Hi,
    oh, This model exported from WEBENCH is 'TRANSIENT' model. You have two solution for the AC analysis of TPS54531. One solution is to use the AC analysis function of WENBENCH tool, there is bode plot on it. You could adjust the parameters of the parts in the default schematic to meet your application requirments. Another solution is to use 'AVERAGE' model of TPS54331, which comes from the same famlily with TPS54531.
    BRs,
    Ryan
  • 0 in reply to Ryan Hu (BSR-MV)
    Prodigy 250 points
    I think using the TINA TPS54331 AVERAGE model will be best for me.

    The WEBENCH tool doesn't allow me to change my input/output conditions without recalculating default values. I want to find a single set of values that works for many conditions. The only way I can get WEBENCH to do this is to make multiple copies of the design and manually set up each one with the component. Also, WEBENCH doesn't let me choose the Type II or III A/B compensation network.
  • 0 in reply to rojo-mojo
    TI__Expert 4035 points

    Hi, Yes, you can't change the default struction of the schematic or you'll lose the loop response result. So the best way is to use TPS54331 AVERAGE model in stead.
    Ryan

  • 0 in reply to Ryan Hu (BSR-MV)
    TI__Genius 9550 points
    hi, I’m going to close the thread due to inactivity, but please post back if you have further questions.
  • 0 in reply to Ryan Hu (BSR-MV)
    Prodigy 250 points
    I was able to take the TPS54331 AC model and simulate the values as calculated by the datasheet of the TPS54531. I then bought an evaluation kit and replaced the components with those calculated/simulated. The output of the TPS54531 was stable, well regulated and within design limits for transient response.