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TPS546D24A: Problems setting up PSpice for VOUT=5V

David Kraeutmann
Prodigy 50 points
Part Number: TPS546D24A

Tool/software:

When trying to simulate the transient model in steady state mode with VOUT=5, I'm getting convergence errors everywhere.

It works fine in startup mode (STEADY_STATE=0).

Convergence errors happen with the average model as well (or it just gets stuck).

I've tried modifying just VOUT, modifying VOUT and the voltage/current loop parameters, etc.

Is there anything I'm missing that needs to be adjusted?

  • 0
    TI__Genius 11266 points

    Hi David,

    I will investigate this and provide you with an update tomorrow.

    Thank you,

    Tomoya

  • 0
    TI__Genius 11266 points

    Hi David, 

    Regarding the transient model in steady state, I am also getting a convergence error and looking into what's causing it. Since the model works fine in startup mode, the short-term solution would be run in startup mode, although it will take longer to run to get to steady because it has to go through soft start. Sorry for the inconvenience this may cause. The alternative would be to use our SIMPLIS model, which appears to be running fine at VOUT=5V without any issue. Let me know if this is a possible alternative. 

    For the average model, I have changed the way we apply the AC source as shown below. This helps fix the issue with convergence. 

    You would need to change the way you probe the phase and gain as seen below.

    Thank you,
    Tomoya

  • 0 in reply to Tomoya Ide
    Prodigy 50 points

    Thanks Tomoya, I'll try that.

    Would it be possible to receive the unencrypted PSPICE model as well as MOSFET internals (rise/fall time, capacitance, etc.) after signing an NDA?


    The unencrypted model would make it simpler to debug potential issues, and the MOSFET internals would be nice for calculating switching losses without Webench (which is a hassle when you're trying to explore different solutions)

  • 0 in reply to David Kraeutmann
    TI__Genius 11266 points

    Hi David,

    We can share the unencrypted PSPICE model after signing an NDA. Please coordinate with your local field support and reach out to me via email (t-ide@ti.com) afterwards.

    Thank you,
    Tomoya