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About TINA-TI design of LM5017 Fly-buck.

Satoshi
Guru 19485 points
Other Parts Discussed in Thread: LM5017, TINA-TI

I want to simulate TINA-TI circuit of LM5017 below spec.

---------------------------------------------------

・Vin：24V±10%

・Vout1：Non-Isolate DC/DC 5V/0.1A

・Vout2：Isolate DC/DC 15V/0.2A

・Vout3：Isolate DC/DC　-5V/0.2A

---------------------------------------------------

But I didn't find how to custom Transformer (2-Isolate DC/DC).

 

Please let me know about way of making a transformer.
(or Setting method)

Or, is there reference design of 2-Isolate DC/DC and 1-Non-Isolate DC/DC?

 

Best regards,

Satoshi

  • 0
    TI__Mastermind 39210 points

    Hi Satoshi-san,

    You could import an ideal transformer model into TINA-TI. A sample netlist is shown below. Of course you will have to add the extra winding to this model for the 3rd output and adjust the values according to your transformers specifications.

    .SUBCKT 1P_TRANSFORMER 1 2 3 4

    LPri 1 1a 2.33E-5

    RPri 1a 2 0.14

     

    * Ls_VALUE = Lp_VALUE * (Ns1toNp)^2

    L2nd 3 3a 2.097E-4

    R2nd 3a 4 0.42

     

    K1 LPri L2nd 0.999

     

    .ENDS

     

    Also, I am sharing a reference design for 2 outputs using LM5017 in WEBENCH with you which you could use as a reference and change according to your needs.

    http://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=BDFEB7E841EFD4D7

    Thanks,

  • 0 in reply to Nikhil Gupta (Product Folder Models)
    Guru 19485 points
    Dear Nikhil Gupta-san

    Thank you for reply.
    I tried TINA-TI, but it isn't done successfully.
    Is there any reference modelof three output design?

    And, I understood that Webench can't make three outputdesign.

    Best regards,
    Satoshi
  • 0 in reply to Nikhil Gupta (Product Folder Models)
    Guru 19485 points
    Dear Nikhil Gupta-san

    Please let me check about 2-point below.

    ①Ideal transformer is too difficult.
    　Coeerctly, Non linear transformer (center tap or separated secunder) is best, is it correct?
    ②In conclusion, is the transformer of 3-output impossible in TINA-TI?

    Best regards,
    Satoshi