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Original question:

TINA/Spice/UCC28C42: Only simulation with perfect coupling coefficient for non-linear transformer works

UCC28C42: PSpice - 'Steady state' and 'startup' differences

Needhu Gunasegaran
Intellectual 2890 points
Part Number: UCC28C42

Hello!

Could you please help me understand the difference between the 2 models: Startup and Steady state?

Both the models have Current mode PWM controller Transient mode as description. So would like to understand the difference between the models.

Do we have documentation or blogs that we could refer to?

Thanks and Best Regards,

Needhu

  • 0
    TI__Mastermind 33115 points

    Hi,

    For the steady state model, internal circuits are pre-biased in a way to speed up the simulation and certain data sheet parameters such as startup current are not modeled. For the startup model, circuits inside the model are biased according to initial application of VDD so that parameters such as startup current are captured in this model version but the simulation run time is estimated to be ~5x longer.

    Regards,

    Steve M