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Isolated DC-DC flyback converter design with Automotive qualified transformer.

Kiran Kumar R
Intellectual 265 points
Other Parts Discussed in Thread: UCC29002

Hi Team,

I'm currently working on the design of an isolated DC-DC converter for an automotive application. While designing with using a one of the non-optocoupler flyback converter, I encountered a challenge in finding an AEC-Q qualified transformer that fits my design criteria.

My input and output specifications are as follows:

  1. Vin (nom): 24V

  2. Vout: 6V

  3. Iout: 7A Max.

I'm seeking your assistance in locating a reference design or obtaining suggestions for the design with automotive qualifications components from TI that align with my project's requirements. The main obstacle is sourcing an AEC-Q qualified transformer. Therefore, it would greatly benefit my project if TI can provide a design with a recommended or verified AEC-Q transformer.

Thanks in Advance,

Kiran 

  • 0
    TI__Guru 73495 points

    Hi,

    We usually contact the transformer vendors to get recommendations as we are not good at the transformers as the transfer vendors.

    You may try Coilcraft, Wurth, and pulse Engineering.

    You can start with searching their web sites.

    We do not have a design to meet your specs so no automotive qualified transformers ready to recommend to you.

  • 0 in reply to Hong Huang
    Intellectual 265 points

    Hi Hong, 

    Thanks for the reply. I have explored their websites as well, and regrettably, I couldn't locate an AEC-Q transformer suitable for my high-current application.

    I'm curious if there's a method for implementing current sharing by connecting the outputs of multiple transformer windings or multiple converter outputs in isolated designs, similar to the approach's we use in non-isolated designs.  This approach might help lower the current requirements for each transformer and potentially make AEC-Q transformers with lower current limits available.

    --

    Thanks in Advance 

    Kiran 

  • 0 in reply to Kiran Kumar R
    TI__Guru 73495 points

    Hi,

    You would need to contact these vendors to find out if they have AEC-Q100 products.

    In non-isolated designs, you make parallel through the inductor with multiple phase control. You would need to do same thing - using multiple phase control and through output inductors to make parallel.

    You can also consider something load sharing like UCC29002.

    It is better you draw your thought into a diagram to ask possible technical solutions.