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

Andreas W.
Prodigy 10 points
Part Number: UCC28C42
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hello,

I am simulating a DCDC flyback converter curcuit, which should have a output voltage of 12V in the range of 110V to 850V input voltage.

The simulation works, till I change the coupling coefficient to values <1.

I use a non-linear transformer with 3 windings.

If I simulate just the transformer and change the coupling coefficient then I have a very low output. Lower than I expect.try_transformer.TSC3146.UCC28C42_rmp.TSC

When I use coupled inductors and change mutal inductance (k<1) it works as expected.

Do I have to use coupled inductors for energy transfer or is something else false?

I hope someone can help me.

  • 0
    TI__Mastermind 31580 points
    Hi Andreas,

    I can ask one of our modelling team to help here. But you need to be careful trying to model non-ideal behaviour or power circuits in SPICE simulators.

    What are you trying to achieve with the non-ideal simulation? Normally these simulations take much more time and can have convergence problems as they introduce high frequency waveforms which require much more calculation.

    If you want a proof of concept then I suggest the circuit you have is sufficent.

    Regards

    Peter