I need help in [design of buck converter]

Discussion in 'The Projects Forum' started by Noah Shum, Feb 14, 2017.

  1. Noah Shum

    Thread Starter New Member

    Feb 14, 2017
    2
    0
    Halo, I am new in electronic.

    My project is going to design of buck converter that can transfer from 28V to 5V for charging iPad. The attachment shows the calculation steps. And I know that the inductor cannot sustain too much current. Therefore, I decide to put maybe 8 or 9 inductors in parallel. Is the calculation correct for designing a buck converter?

    And now I am in the stage of prototyping, I have bought the following components already. But I think maybe wrong....
    - 1 x Arduino for control the MOSFET switch frequency
    - 1 x Electrolytic Capacitor, 22µF, 10V, MS5 Series, RubyCon
    - 8 x Inductor, 680µH
    - 1 x NPN Power MOSFET, IRFP450, 14A, 500V, 190W
    - 1 x Diode, MIC 1N4001, 50V, 1A

    Is everything alright? Anyone could left some comments for me, please? Thanks for your help!!!!!

    upload_2017-2-15_20-45-24.png
    (Moderator's note: image rotated and reduced to gray scale to reduce file size and make it possible for people to read. -dc)
     
    Last edited by a moderator: Feb 15, 2017
  2. AlbertHall

    AAC Fanatic!

    Jun 4, 2014
    6,392
    1,485
    I can't read sideways writing. If the 1N4001 is going to be working at the switching frequency then it is not going to work well - it is too slow. Try a 1N4933 or UF4001.
     
    Noah Shum likes this.
  3. Noah Shum

    Thread Starter New Member

    Feb 14, 2017
    2
    0
    Is the diode should be the type of fast recovery?
    So that the 1N4933 and UF4001 belong to the type of fast recovery diode?
    I have uploaded the new calculation photo!
    Thanks your reply!
     
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