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UCC28180 DESIGN CALCULATOR TOOL

charkaoui abdelmouneim
Prodigy 205 points
Other Parts Discussed in Thread: UCC28180, UCC28910, UCC28180EVM-573

Hi everyone,

Actually i'm designing a PFC CCM using the UCC28180 IC. I have the calculator tool and the datasheet that are both provided by TI. the probelem is that on the calculator there is so many parameters that are calculated (expl: favg, heat sink sizing, ...) without giving the corresponding formulas in the datasheet. And there's other parameters that are taken in account without given them values such as the input RMS voltage. 

can any one give me the formulas of the this excel calaculator sheet ? 

here is the link : www.ti.com/.../toolssoftware

Best regards!

  • 0
    TI__Prodigy 265 points
    Dear Charkaoui, please send me your corporate email via private message. I will answer you directly.

    Regards, Fernando
  • 0 in reply to FRM
    TI__Genius 15910 points

    I can send you a veiwable version if this attachment does not work...

    UCC28180 Design Calculator_SLUC506_viewable.xls

  • 0 in reply to Lisa Dinwoodie
    Prodigy 205 points
    Dear Lisa,

    Thank you very much for replaying,

    best regards!
  • 0
    Prodigy 20 points
    Hey! :)
    Why are there two different values (Datasheet p.309 and Calculator Tool Cell C180) for M1*M2?

    Datasheet: 0,751
    Design Tool: 0,323

    I already set all values (fsw,n..) at the same value.

    Thank you :)

    Chris
  • 0 in reply to Lisa Dinwoodie
    TI__Guru 71516 points

    Is there also a calculator for BROWN-OUT conditions?   Or do we have an App Note for adding brown-out protection, similar to www.ti.com/lit/an/snva750/snva750.pdf for the UCC28910?

  • 0 in reply to Christian Engesser
    TI__Genius 15910 points

    The design calculator defaults to the average input line voltage in order to optimize the loop at the mid point of operation whereas the data sheet uses 115Vrms (nominal low line input).    Please note that the design calculator enalbles the user to input any desirable line voltage in cell J180 to calculate the VCOMP value at full load at that specific desirede line voltage as well as any percentage of full load at that specific desired line voltage. 

    The sheet named VCOMP (see bottom tabs in design calculator) shows all the calculated values for M1M2 at the desired line input voltage and percent load. 

    The sheet with the tab labelled data shows the M1 and M2 values calculated for the average of the line input voltages that were input at the beginning of the initial calculator page. 

    The design calculator is written to optimize the design over the entire working range and all of the calculatoions are viewable in the cells.

  • 0 in reply to Lisa Dinwoodie
    Prodigy 205 points

    Lisa, 

    This is maybe a very basic question, but please excuse my ignorance, ...!

    Can you please tell me what is the frequency of the current/voltage ripple at the output of the Boost converter? is it equal to the frequency switching or does it change with respect to other parameters?

    PS: I know that the amount of ripple will be function of frequency switching, inductor size, output capacitor ESR, load ... . But the question is about the frequency of that ripple. 

    Thank you so much, 

    Abdelmouneim

  • 0 in reply to charkaoui abdelmouneim
    TI__Genius 15910 points

    Hi Abdelmouneim,

    The output will have a high frequency ripple that is at the switching frequency that will be "riding" on top of ripple that is at a lower frequency equal to the full-wave rectified line-frequency (which is why it's at 2 X fline). 

    If you look at the Users guide for the UCC28180EVM-573, Figure 13 shows the AC coupled output voltage with the board set to full load and the time scale is 2 ms per division.  The input is 115Vac, 60 Hz.  You can see there is a 119 Hz or so sine wave of 10 V peak to peak on the output (signal is AC coupled so this is on top of the 390VDC output). So this is the 2 x fline that is coming through to the output.

    And then if you look at Figure 15 in the users Guide, under the same input conditions and same load, looking at the output much closer, on a 4 us per division scale, you can see the switching frequency ripple...about a 1 V pulse with noise that's at approximately 120 kHz.  This is the switching frequency ripple that is coming through (and makes the trace in Figure 13 look a bit thick).

    You can see the same thing for the 230VAc onput at 50 Hz by looking at Figures 14 and 16: a 100 Hz low frequency "wave" of output ripple at approx 12 V peak to peak and a 120 kHz ripple/noise that is approx 1 V.

    If you notice the traces shown in fig 15 and 16 are also ac-coupled but because they are riding on top of the bigger ripple at the lower frequency I couldn't get the traces to be right in the middle of the scope plot...a moving target on a moving target.

    So the short answer is the output ripple will be composed of two components: high frequency switching noise ripple added to low frequency ripple from the rectified line..  I hope this helps.