The application will be a stepper motor tester for varying motors, hence the adjustable voltage.
In the datasheet, they mention that the PCB layout is very important for this device:
They also give this layout pattern which I admit to not fully understand:
I made this schematic here with the following PCB layout.
The heatsink might change, but the actual Schottky diode and the LM2678 have the tab connected to ground, so I would like to share the heatsink.
J1/J2 pin headers are just for demo, in real design they will get replaced by beefier screw terminals of course.
RV1 will actually be replaced by a front panel potentiometer and not be on the board; it's for reference here only.
And once again, with the zones filled (but harder to see silkscreen):
My questions would be:
The bold traces from the design are all very small and copper pours are used for ground and L1 to C3. Other track widths are 2mm. I tried moving the feedback wiring far from the inductor. Would this layout seem acceptable?
Is there some trace/part (I'm sure!) that could be improved?
They say prototype etc, but I only need to make two or so of those boards so I'd like to get this right and obviously on a breadboard this cannot be much tested layout-wise, so what other guidelines would there be to follow, or is this a bit of a tall order without tinkering on a real PCB?