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LMR51625Y Buck converter simulation Too slow

SS202602185019

"Hey, I’m running a simulation with the attached circuit and config, but it’s running incredibly slow. I’ve set the Run To Time to 50ms with a Maximum Step Size of 100ns. That’s 500,000 steps minimum, and it's taking forever. Does the step size need to be this granular, or is there something in the circuit causing a convergence bottleneck?""Hey, I’m running a simulation with the attached circuit and config, but it’s running incredibly slow. I’ve set the Run To Time to 50ms with a Maximum Step Size of 100ns. That’s 500,000 steps minimum, and it's taking forever. Does the step size need to be this granular, or is there something in the circuit causing a convergence bottleneck?"  , This simulation is after 5 Minutes

  • oldmouldy
    0

    The provided TI sample has a 4.5ms end time and takes around 20 minutes to run for me. You are running for twice that time so you could expect, at least, around double that for your simulation. A simulation with a transient model evaluates every cycle of the circuit in detail, that will never be "fast" for a switched mode controller like this. PSpice will attempt to find the optimum step size dynamically; the Maximum Step Size forces PSpice to evaluate the circuit, even if the dynamic step size doesn't schedule an evaluation. This can improve the resolution of the output. Transient models like this are only ever usable for investigating startup conditions, they are impractical to use for any load testing for which "state averaging" models are required.

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