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UCC28950: DC/DC 3kW converter

Andrea Cavazzoni
Prodigy 80 points
Part Number: UCC28950
Other Parts Discussed in Thread: TINA-TI

Hi,

I want to design a DC/DC power supply 48V 3kW and I want to use the UCC28950, because I would like to have a ZVS phase shift stage.

I want to start with the TINA-TI example, but it is designed for 12V output.

I have also the UCC28950 datasheet and I recalculated all the values of the passive components.

Is there a link to a thread or to a blog that explain how to change parameters of the TINA-TI schematic and a brief explanation to use the UCC28950 in this situation?

Thank you.

  • 0
    TI__Mastermind 25570 points

    Hello Andrea

    I'm not aware of any specific Blog or Thread that tells you how to proceed - however the UCC28950 is a good choice at this power level. If you post some specifications - Vin range, Vout range etc, I can give some further guidance.

    We have both an Excel and MathCad calculator for this device. These will calculate the principle design parameters - transformer turns ratio for example. You can find them at the UCC28950 product page at http://www.ti.com/product/UCC28950/toolssoftware  

    One important thing to note is that the Excel calculator rounds the turns ratio to the nearest integer. This is not actually the best thing to do. When you use the calculator, you should copy and paste the result from line 25 into line 26 rather than reading the integer value at line 25 and entering it in line 26. The copy and paste operation preserves the full decimal value of the result in line 25 - although only the integer value is actually shown. In your case, the integer is likely to be 5, but the real value is 5.35.  See the screen shot below - Please let me know if the screenshot does not appear .


    Regards

    Colin

  • 0 in reply to Colin Gillmor
    Prodigy 80 points
    Hello Colin,
    I downloaded the Excel file and I'm trying to use it to design values of the component to put into TINA TI schematic and then I will simulate it.
    I write you some specs of the project:
    - Vin_min = 370; Vin_typ = 390; Vin_max = 410.
    - Vout to control 56V (maximum 58V).
    - Iout 40A (maximum 50A).
    - Fswitching 70kHz.
    - Efficiency around 93-94%.

    Thank you.

    Best regards,
    Andrea