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Closed-Loop Controller for Flyback Converter with Multiple Outputs

Ken Ndubueze
Prodigy 20 points

I am designing a flyback converter with the following specs: Vin: 36-48V(DC), Vout1: 24V(DC) @ 1A. Vout2: 12V(DC) @ 1A. Vout3: 5V @ 1A. Switching Frequency: 50kHZ. I am a student and this is my first time designing one of these. I need a controller for closed loop feedback and to be in a sizeable (DIP) package as we lack facilities to handle the TSSOPS. Thanks.

  • 0
    TI__Mastermind 31130 points
    Hello Ken,

    Thank you for your interest in TI products and technology. I did a preliminary search of our reference design database and didn't find any that closely matches your specifications, but that is not surprising. I'll need more time to do a more thorough search. I'll be looking for a design that reflects as closely as possible your topology, number of outputs, and power level, rather than try to match voltages and currents.
    The point of that is to provide you with a useful reference on how the 3-output design would be structured, which you can then use as a model for your particular requirements.

    I would also invite you to go to the TI home page and try the Webench Designer program shown at the lower right corner of the browser window. This can also help to quickly generate designs for you, including multiple-outputs.

    Regards,
    Ulrich
  • 0 in reply to Ulrich Goerke
    TI__Mastermind 31130 points

    Hello Ken,

    I did a lot more searching, but couldn't find a design that I thought was close enough to your application.  However, for illustration purposes I found this schematic for PMP1595, which has 3 outputs and conversion topology and control in the manner I think you are looking for.  PMP1592_REVA_SCH.pdf

    This design has not been built or tested, but that is beside the point.  It is indicative of the kind of design configuration and complexity for your application.  I hope you can use this as a guideline to continue your work.

    Regards,
    Ulrich