Electronics > Beginners

PCB Design

(1/3) > >>

nuclear213:
Hello everyone,

I am currently studying electrical engineering in Germany, sadly we have no course about PCB layout and design and as far as I could find out not even a professor with experience in this field :palm:. Since we have semester breaks right now I thought it might be good to idea to try it out a bit. Previously I was just building my circuits on perfboard so I have no idea how to design a good layout especially with SMD components.
This design is just a DC-DC converter and a h-bridge with a SM72295 full bridge driver, however at somewhat high currents (7A-10A@40V). Also the switching frequency of the DC-DC converter is quite high with up to 1.5MHz so EMI could become a problem.
To adress the problems I filled in most copper parts with areas, split the ground plane and tried to keep the tracks as short as possible but I am sure I violated at least one or two good design practices.

So if anyone could see the gerber files and give me a few tips it would be geatly appreciated.

Thanks in advance
nuclear213

Edit:
Thanks for the videos Dave :) There were a great help and inspiration to me. I have been watching them since I was 14 years old. Keep up the good work  :-+

teksturi:
It would be much nicer to people that you submit schematic and board layout top and bottom straight to forum using png's. I atleast think that then you will get responses.

Edit: And welcome to forum.  :-DMM

homebrew:

--- Quote from: teksturi on August 13, 2019, 08:47:50 pm ---It would be much nicer to people that you submit schematic and board layout top and bottom straight to forum using png's. I atleast think that then you will get responses.

--- End quote ---

And additionally - especially as this is a KiCAD project, just add the whole thing.
Some things in the schematic seem incorrect - like the 39K resistor on the feedback voltage divider ...

JustMeHere:
I'd be wary of a split ground plane.  You need to make sure you have a good return path. Read  High Speed Digital Design: A Handbook of Black Magic.

nuclear213:
First of all thanks for the replys.
Yes the feedbackresistor was wrong. I dont know how I did not see that. Thanks for the tip.

Regarding the gerber. I thought it was the most universal option to transfer the schematic. But I agree that it is easier with the pictures. Sadly I dont really see a good option of exporting pictures so I hope the export from the 3D viewer are good enough. Otherwise I will look into it.


@JustMeHere:
Well in theory there should be a good return path for all the different parts. The control signals should not need to go on the power GND and vice versa. So there should be also no real current flowing between them. At least that is how I understand it. Please correct me if I am wrong.
Regarding the book: After a first quick search I can only find it for above 100€. Sadly a bit expensive for me right now. Also I am not sure if 1.5MHz really classifies as HF. The description of the book itself states > 10MHz but I will surely keep it in mind. Thanks :)


Navigation

[0] Message Index

[#] Next page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod