PCB Layout for Shunt Resistor

[john21443]

Hello,

I am layout out PCB for device that includes power sensing.   I am using this resistor for R1: https://www.mouser.com/datasheet/2/418/NG_DS_1773449-3_F-1140363.pdf.   Specifically, the one in the 2512 package.

This is not a 4 wire package.   Please take a look at the attached pcb screen shot and provide any feedback you have on how I laid out the traces.   Sizing of the main feeds were from kicad pcb calculator with expected max 6A current.

Thanks,

John

[german77]

Looks fine to me. But the traces are very close to the other terminal of the resistor R2 and R3 for my commodity. Turning them 90° should leave better clearance for the traces

[john21443]

Thanks for the feedback.

[tszaboo]

There you go, an appnote on it.
It all depends on how much accuracy you need.
http://www.analog.com/en/analog-dialogue/articles/optimize-high-current-sensing-accuracy.html

[john21443]

Thanks!   I think I ran across that a while ago and completely forgot about it.