I need help in [design of buck converter]

Thread Starter

Noah Shum

Joined Feb 14, 2017
2
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:

AlbertHall

Joined Jun 4, 2014
10,909
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.
 

Thread Starter

Noah Shum

Joined Feb 14, 2017
2
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.
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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