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UCC28070: Support for AC530V Input

Conor
Guru 10090 points
Part Number: UCC28070

Tool/software:

Hi,

I am currently evaluating the UCC28070 for use in a PFC application with an AC input voltage range of 200V to 480V and a maximum input voltage of 530V. For an AC input of 530V, the rectified DC voltage will reach approximately 750V (530V × √2). While the UCC28070 itself does not directly handle high voltages, can you confirm that the IC can support this level of input voltage through proper external circuit design?

I look forward to your response.

Thanks,

Conor

  • 0
    TI__Mastermind 44820 points

    Hi Conor,

    Yes. With proper component selection, the UCC28070 can be used on higher voltage buses. 

    I hope this answers your question.

  • 0
    TI__Mastermind 33670 points

    Hello Conor, 

    Yes, the UCC28070 PFC controller should be able to work in this situation with suitable resistor-dividers on VINAC and VSENSE inputs. 

    Vin max at 530Vac is about 480Vac +10%, so I assume that the low end of the input range would be 200Vac -10%. 
    The ratio of 530V to 180V = 2.944 which is slightly less than the ratio of 265V/85V = 3.117, so the quantized feed-forward feature of the UCC28070 should work over this high-voltage range the same as if the input was 85Vac~265Vac.  

    I suggest to set Vout to be at least 770Vdc, maybe a little higher, to provide enough demagnetization voltage across the inductor at the peak of 530Vac.

    Regards,
    Ulrich