I'm fairly new to PCB designing, but I'm loving experimenting with it. Currently, I'm trying to develop a simple PWM circuit using MOSFETs to control an RGBW strip, using an Arduino with an integrated voltage converter (design is based off this project I found). Here is a picture of my original PCB design:
To give an overview of the design: A barrel connector connects top right and supplies 12V and GND. This ground is then connected to the voltage converter, as well as to one of the legs of each of the MOSFETs and the GND for the Arduino to power it along with the 5V out from the converter. The Arduino will be powered from the 2 top pins on the left and then interface with the remaining pins on the left hand side, using PWM to drive the MOSFETs via a resistor. Finally, the RGBW strip attaches to the pins on the right.
Whilst I am confident with the functioning of the circuit, I had one question: Is it okay to connect all the GND pins of the MOSFETs in the way above? Or should they each have their own path like this design below?
As you can see, the only difference with this second design is that all the MOSFETs have a slightly different path to ground (with the exception of the
white one). Will it make any difference which design I use? My main concern was that the top design would lead to voltage drop and that's why I have come to here, to find out whether it makes a significant difference or not.
P.S. I am using IRLZ44N MOSFETs and this voltage converter.