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UCC29910A: Design Calculator_SLUC265A

Part Number: UCC29910A
Other Parts Discussed in Thread: LM74670-Q1

Hi,

 

I’ve downloaded the “UCC29910A Design Calculator (Rev. A)” (UCC29910A Design Calculator_SLUC265A.xls) from:

http://www.ti.com/product/UCC29910A/toolssoftware

 

And I would like to be able to edit some cells, as my application will run on lower voltage and I need to change some of the feedback resistor.

 

Unfortunately the spreadsheet is mostly locked, and protected by password.

 

Could you please inform me of the password, or send me an unlocked version of this same spreadsheet?

 

Thanks.

 

Kind Regards,

 

Mateus Ohse

Engineer - J1LED

  • Mateus,

    I will check this with the product line and get back to you.

    Thanks,
    Bernard
  • Mateus,

    Can you also give more details about your application, input voltage range, output voltage etc?

    What part of the calculator are you trying to change?


    The UCC29910A does have limitaions on the expected input and output voltage ratio, and the line sense divider must have 4:1 gain ratio with the output bus voltage sense network.


    Thanks,
    Bernard
  • Hi Bernard,

    The input is going to be 60VAC, and 28 - 30 VDC / 100W output.

    I would like to be able to modify R28, R30 and R31 resistor values on the spreadsheet, to increase Ioc.

    This will also decrease the Thevenin impedance of VBLK-pin.

    I just would like to simulate it on the spreadsheet, and have access to the formulas.

    Could you please fetch me the password?

    Thanks

    Mateus

  • Mateus

    I just wanted to check why you chose to use the Buck PFC?

    What is the input voltage range and AC freq?


    With 60 V AC nominal, and bus voltage ~30 V, this will give a wide conduction angle, so this will be good for PF. There will be ~2.2 ms dead-time near each AC zero-crossing at 50 Hz.

    However, with such a low bus voltage, the output cap will need to be very large to support the 100-W load during the 2.2-ms dead-time.

    Also, the currents in the Buck FET, choke and free-wheel diode will be very large.


    I am awaiting a response regarding the design calculator.


    Thanks,
    Bernard
  • Hi Bernard,

    Thanks for your help.

    The inductor I'm planning to use is a 15uH/25A (IHLP6767GZER150M01).

    For the capacitors 3x 2200uF / 63V (UPW1J222MHD). That should give me enough ripple current capacity as well.

    For the diode the DSTB60100C, a dual 30A /100V diode in a TO-263 package. The voltage is only about 1.2x above margin though. Or even the V40PW10CHM3/I -> 40A / 100V, very low Vf.

    Do you reckon 100V is too low? 

    I also have available the 20ETS08SPBF, 800V / 20A, but higher Vf.

    For the FET the FDB035N10A (100V / 214A) or FDB3652 (100V / 61A). But again, maybe too low voltage?

    The input rectifiers I'll use an Ideal Diode bridge (LT4320 or LM74670-Q1 or LTC 4359)...

    Any flaws on that? :-D

    I just would like to have access to the formulas on the spreadsheet, to double check my resistors dividers.

    Thanks again for your help.

    Cheers

  • Mateus,

    What is the max and min input voltage? Or the +/- tolerance of your 60 V AC input?

    Is the input 50 Hz AC or another frequency?


    Can you give me your email address so that we communicate directly regarding the design calculator?


    Thanks,
    Bernard
  • Hi Bernard.

    The input is going to be from a 30-0-30 V transformer, 50 Hz.

    My email is mateuso@j1led.com.

    Cheers.