| Electronics > Projects, Designs, and Technical Stuff |
| Critique my first PCB |
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| carl0s:
I was reading Dave's 2004 PDF the other night!! :) Anyway, here is my latest revision. Better. I made the drill holes 12mil too. They were 10mil before. |
| ANTALIFE:
My first though is that it looks like you have a switching DCDC converter, not sure of the current/power requirements but if it was me I would try connect each component that is part of the power path with a thicker track or a plane like this: |
| carl0s:
--- Quote from: ANTALIFE on May 20, 2018, 06:03:06 am ---My first though is that it looks like you have a switching DCDC converter, not sure of the current/power requirements but if it was me I would try connect each component that is part of the power path with a thicker track or a plane like this: --- End quote --- Yes I thought that might come up. I'm just not quite sure how to do it in Altium other than by literally drawing the polygons, and I can see them ending up rather ugly :-) I might have a go though. It's an AP5724 DC to DC converter. http://www.internetsomething.com/lcd/AP5724%20backlight%20driver.pdf There's 6 LEDs in series, at 20mA, 18v total, so 360mw total. They say the above driver chip is 84% efficient, so expected draw of 430mw. Call it 500mw. I'm not really sure I know enough about this stuff, but I gather it's current that matters. So the 500mw should pull 151mA from the 3.3v supply. I've used 10 mil traces which an online calculator says should be good for 450mA with 1oz copper. The LCD panel itself pulls 15mA. So I'm at about 165mA. What do you think? I suppose it makes sense for me to learn how to do the job properly though doesn't it.. |
| carl0s:
I've just tidied up some stray ground tracks for now, from before I did the ground fill on the top layer |
| David Chamberlain:
What happened to the fill on the bottom? |
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