Electronics > Projects, Designs, and Technical Stuff
1st try at SEPIC charger layout
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ratio:
I'm working on a charger that will charge a 12V 5AH SLA from an automotive source, so input could be anywhere from 'key off low battery' to 'full charging current'. I found a Linear part, LT1512 (datasheet here), which seems to fit the bill.
Does the attached layout look like it will work? Any pointers or suggestions?
The schematic is taken directly from the data sheet until I have a better feel for what's going on. The size of the board is just something I picked for no special reason--eventually it will be shrunk to whatever size is appropriate. The component are again taken from the data sheet more-or-less verbatim; and sized for a manual process.
viperidae:
Has that c2 in the tiny package you have on your layout got enough ripple current rating?

They have recommended layouts in the data sheet.
ANTALIFE:
Yea your trackwork looks a bit small for what it's going to do. As always pays to refer/copy the layout examples from the datasheet (pg 9)
T3sl4co1l:
No ground plane / flood fill?

Tim
ratio:
I'll double check C2. I just went through the BOM one at a time & did a parametric search at Mouser, I'm sure the parts could be better selected.
I'll go over the trace sizing. I was trying to figure out KiCad's net classes & spent less time thinking about the current than I should have.
And there is a ground pour, I turned the display off to make it a little easier to see the traces.
So, looks like it's possible it'll work then? I read a few articles about laying out power supplies & converters & was working on minimizing current loops around the inductors. I thought about putting vias in the pads & putting some components on the back side, but maybe that's not a good idea? Or would that be less of an issue with a manual soldering process?
What about C3 right in the trace like that? Done all the time? 'What was he thinking'?
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