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UCC28610: UCC 28610 RCL design

wonjune Lee
Prodigy 80 points
Part Number: UCC28610
Other Parts Discussed in Thread: UCC28742

Tool/software:

Hello,

I am designing a flyback converter based on the UCC28610.

Given parameters:

  • Minimum input voltage: 250V
  • Maximum input voltage : 800V
  • Maximum output power: 16.45W
  • Operating frequency: 70kHz
  • Output voltage: 17V
  • Efficiency: 80%
  • Dmax: 0.3

From these values, the turns ratio (n) is calculated as 6.3, and the inductance (L) is selected as 2mH.

When designing the CL resistor, substituting the values into the formula:




However, the recommended maximum value for the CL resistor appears to be 100kΩ.

Does this mean that the design is not feasible with my selected parameters?
Increasing the switching frequency to reduce MOSFET switching loss and heat generation has its limitations.

  • 0
    TI__Guru* 86266 points

    Hello,

     

    If the CL resistor you calculated is larger than the maximum the device can operate with, this means the design is not feasible.  So, you are correct.  

     

    You might consider using the UCC28742 in your design instead for a flyback converter.  The following link will bring you to the product folder for this device.

    https://www.ti.com/product/UCC28742

     

    If you have any question regarding the UCC28742 please repost in the e2e with UCC28742 in the thread title.

     

    Thank you for your interested in power control devices from Texas Instruments.  If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

     

    Regards,