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TPS55010: To analyze 2-output flyback converter with TPS55010, How to TINA-TI modeling a transformer?

Bob Lee62837
Mastermind 7230 points
Part Number: TPS55010
Other Parts Discussed in Thread: TINA-TI, LM5018, UCC2891

Dear support member,


As previous Post locked,
I new post.


My customer used TPS55010.

I would like to analyze a two output flyback converter,
Could you teach me how to TINA-TI model a transformer with multiple windings?

Specification condition.
Input voltage： 24V
Output Voltage：± 18 V
Ioutput Current：0.05A


Best regard.
Bob Lee.

  • 0
    TI__Mastermind 35115 points

    Hi Bob,

    Something like below could be used to model flyback transformer with 2 secondary windings. This is a relatively basic model but it is enough to show the output going into regulation. Specifically it doesn't have anything to model the effects of cross regulation and I am not sure how to model this. Also you will likely not have any values for the core resistance (RCORE) and inter-winding capacitance (CINT). If you need to include some of these specifics in the transformer model, I suggest checking with the transformer vendor.

    Attached is the source TINA simulation this image comes from.

    After going through this I noticed the design requires an input voltage of 24 V. The TPS55010 does not support this high of input voltage. I suggest looking at LM5018 or similar.

    Best Regards,
    Anthony

    slvm602_2-outputs.TSC

  • 0 in reply to Anthony F
    Mastermind 7230 points

    Dear Anthony,


    Thank you very much for reply.


    I mistaked Vin range.
    Input voltage 5V.

    I send my customer you answer.

    I will feedback you.

    Best regard.
    Bob Lee.

  • 0 in reply to Bob Lee62837
    Mastermind 7230 points

    Dear Anthony,


    I feedback about my customer progress situation.
    My customer was able to confirm that it works.
    Thank you very much for answer.


    May I ask add a question?
    How can I create an equivalent circuit of a Optocouplers with TINA-TI?

    Best regard.
    Bob Lee.

  • 0 in reply to Bob Lee62837
    TI__Mastermind 35115 points
    Hi Bob,

    Glad to see the transformer model worked for the customer.

    I have not simulated an Optocoupler before in TINA-TI but I think it should be possible. What I suggest to tryying is to see if there is a PSPICE model for the Optocoupler the customer wants to use. This can then be imported into TINA. In case any help is needed to import the model, the link below is a how to video.

    training.ti.com/importing-spice-models-tina-titm-simulator

    Anthony
  • 0 in reply to Anthony F
    Mastermind 7230 points

    Dear Anthony,

    Thank you very much for reply.

    I confirmed about SPICE model.
    There was no SPICE model for the Optocouplers the customer wants to use.

    Therefore,
    I would like to think creating an equivalent circuit of a Optocouplers.

    How can we make an equivalent circuit?
    Is there anything way?

    Best regard.
    Bob Lee.

  • 0 in reply to Bob Lee62837
    TI__Mastermind 35115 points

    Hi Bob,

    Sorry, I am not familiar with an equivalent circuit to model opto-couplers. I suggest checking with the opto-coupler vendor to help with this.

    Anthony

  • 0 in reply to Anthony F
    Mastermind 7230 points

    Dear Anthony,

    Thank you very much for reply.

    Incidentally,
    Do you know someone that familiar with equivalent circuit of a Optocouplers?

    Best regard.

    Bob Lee.

  • 0 in reply to Bob Lee62837
    TI__Mastermind 35115 points

    Sorry, I do not. I also think it is best to get a more realistic model from the vendor for the optocoupler they plan to use instead of trying to create a simple equivalent circuit. Is there maybe a similar optocoupler that does have a PSPICE model the customer can use for their simulation instead?

  • 0 in reply to Anthony F
    Mastermind 7230 points

    Dear Dear Anthony,

    Thank you very much for reply.

    My customer does not have PSPICE model.

    Device is is not same,
    Can you simulation using following file?

    UCC2891_START.TSC
    UCC28600PMP1905_TRANS.TSC


    File is from TINA-TI EXAPMPLE.

    Best regard.
    Bob Lee.

  • 0 in reply to Bob Lee62837
    TI__Mastermind 35115 points

    The simulation will probably run using these optocoupler models. However I still highly recommend they get a model for the optocoupler they plan to use or a similar optocoupler to have a simulation closer to the real circuit. The model used in the UCC2891 is likely just the PSPICE model for the SFH690 taken from Vishay's website.

  • 0 in reply to Anthony F
    Mastermind 7230 points

    Dear Dear Anthony,

    Thank you very much for consider some optocoupler models.

    Also,I will feedback my customer reply.


    Best regard.
    Bob Lee.