Hi all,
I have been working in a complicated design for some time now. Its finally time to make the new PCB which i hope is the final version. Before i continue working on the design i would love your feedback about the PCB trace layout. I tried to include all critical info in the pictures below.
This part of the PCB can be considered a 12V automotive fusebox. The power comes in from the main terminal to the righ. Runs trough a shunt, trough a relay, and to different outputs. There is also an unswitched output and 2 inputs both with a shunt. The other large resistors and TVS diodes are there to suppress voltages spikes like automotive load dumps.
I have a couple of concerns.
- Will the 40A traces be able to handle this current with 2oz copper?
- The shunt voltage will be VERY weak. I want to measure voltages between 50uV and 50mV. Will the high current traces induct noticeable voltage?
- I used vias to route current to the shunts on the bottom of the board. What is a sensible via size and setup for this?
- is 0,3mm distance enough between all tracks?
Please keep in mind this is a work in process. Finetuning is needed. There also is no ground yet, but bottom will be used for this.
I would really appreciate you feedback!
![PCB design: High current tracks + low voltage measurement (Please review)](https://www.eevblog.com/forum/index.php?action=dlattach;topic=253056.0;attach=1061866;image)
![PCB design: High current tracks + low voltage measurement (Please review)](https://www.eevblog.com/forum/index.php?action=dlattach;topic=253056.0;attach=1061870;image)
![PCB design: High current tracks + low voltage measurement (Please review)](https://www.eevblog.com/forum/index.php?action=dlattach;topic=253056.0;attach=1061874;image)