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UCC28180: Clarification in the reference design tidu962b

sivakumar suseendran
Prodigy 85 points
Part Number: UCC28180

Hi,

            We are trying to implement the same PFC design from the reference design tidu962b. I got few doubts

        • We got only 390uH inductor. Can we implement using higher inductor values?
        • If the supply voltage is below 195V what will be happen to the system and it performance?
        • Why 40 percent of maximum input current is taken as ripple current generally we will take some percentage of average current as ripple current

Kindly, help me out and thanks in advance.

Regards,

Sivakumar.S

  • 0
    TI__Mastermind 31580 points
    Hi Sivakumar,

    Thanks for your interest in TI's products. I have asked one of our applications engineers to take a look at this and you should see a reply within a day.

    Regards

    Peter
  • 0 in reply to Peter Meaney
    TI__Mastermind 25570 points

    Hi Sivakumar

    We got only 390uH inductor. Can we implement using higher inductor values?: Yes you can, the tidu962b uses 360uH and the inductor ripple current will be a little lower with 390uH but not significantly so.

    If the supply voltage is below 195V what will be happen to the system and it performance?: Line currents will increase to maintain a constant output voltaqe. The inductor must be able to support the maximum current - this will be the peak of the sinusoidal line current, plus the ripple current peak  at low line.

    Why 40 percent of maximum input current is taken as ripple current generally we will take some percentage of average current as ripple current: This is a relatively arbitrary figure and should be used for guidance. As the tidu962b documentation states there is a tradeoff between several factors. You have to decide what is most important in your application and design the inductor accordingly - for example - full load THD, power loss in the inductor, size nd weight of the inductor and light load efficiency.

    You can use the Excel calculator for this device to help you to make these tradeoffs - you will find it at http://www.ti.com/lit/zip/sluc506

    Regards

    Colin

  • 0 in reply to Colin Gillmor
    Prodigy 85 points
    Thanks Colin ! I'll continue the design with 390uH. Thanks again for the clarifications .