Electronics > Beginners
PCB Design
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schratterulrich:

--- Quote from: nuclear213 on August 14, 2019, 07:46:17 pm ---Well I split the ground planes because the design rules of the buck-converter controller ic stated that.

--- End quote ---

In the datasheet a layout is shown with the starpoint at the output capacitor:

The IC compares the voltage at the output capacitor to its internal reference. So you want to sense this output voltage without any interferences.
When you look at the layout there is only the quiescent current of the IC flowing int the GND plane between the output capacitor and the IC GND connection.
So there will be minimal galvanical coupling and the GND split make sense.

You have placed the starpoint at the input connector:

If the IC senses Uout, the voltage drop of your power currents will add to the voltage sensed at the feedback input. I would suggest to move your GND starpoint and your feedback sense line directly to the output capacitor C8.

nuclear213:
Ok I will change that. I guess the ideal place for the feebbackwire would be the input in the driver, since it would compensate the entire losses that way.
However I am not sure about the control loop stability then, so I will just route it on the bottom layer directly from the cap pin.

So thanks a lot everyone. You were a huge help. I will order the pcb and the parts in the comming days and build it up.
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