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Original question:

UCC28910: Request for Transformer connection review:

UCC28910: Request for Transformer Schemtics review:

Saif Shaikh
Prodigy 125 points
Part Number: UCC28910

Tool/software:

Dear Team,

We are currently working on a flyback converter design using one of TI’s flyback controller ICs. We have received the transformer (T2) from our magnetic component manufacturer, and it meets our electrical specifications. However, we require assistance in correctly identifying which physical pins of the transformer correspond to the primary, auxiliary, and secondary windings as per TI’s flyback converter topology.

We tested the circuit on our board and observed the following:

  • 12V is successfully obtained at the secondary output.

  • No voltage is appearing at the auxiliary winding output.

  • We suspect a mismatch or misconnection in the transformer pinout.

  • The transformer winding details (turns ratio) are clear, but pin mapping needs clarification.

We want to ensure proper connections and avoid layout or wiring mistakes. Kindly help us identify the correct transformer pin assignments, primary, auxiliary, and secondary,y based on the datasheet and schematic.

Schematic and Manufacturer Data are attached.

Your support will help us proceed with a reliable implementation.

Best regards,

Saif Shaikh 

  • 0
    TI__Guru* 85676 points

    Hello,

     

    The transformer manufacture should give you a mechanical drawing showing the connections of the pins.  They should also have clear markings for the transformer polarities.  You should work with the manufacture to get the information that you have requested.

     

    Based on your input voltage is looks like W1 is your primary winding and W2 and W3 are your secondary windings.

     

    You should be to use the Webench design tool to check your primary magnetizing inductance and turns ratio of the transformer.  It can be found on the product page.  You just need to enter your input and output power requirements and the tool will generate a bill of materials and a schematic.  The following link will bring you to the product page.

    https://www.ti.com/product/UCC28910?

     

     

    Regards,