So, I am using uptocouplers and digital isolators for a project connected to a microcontroller GPIO. I removed the ground (ground plane cutouts) under the load side of the components, is it necessary to do this on all 4 layers or just on the toplayer where the components are located? I do have vias carrying the load-side signals near the components, that's why I cut away all ground. Is this correct? The PCB is meant as a control hub for an AGV with a nominal working voltage of 48VDC (battery supplied, 55V charger supplied, during deceleration or braking up to 100V). The loads controlled are various contactors, detectors and a motor brake input.

  • \$\begingroup\$ You haven't justified that it's necessary at all. Who knows what "the load side" means other than you? Who knows what circuit you are talking about or what your requirements are? \$\endgroup\$ – Andy aka Jul 15 at 10:10
  • \$\begingroup\$ Hi, Andy, you are right. The "load side" are various industrial detectors, an isolated CANbus, various relays and a motor-break input. \$\endgroup\$ – Alex Er Jul 15 at 10:11
  • \$\begingroup\$ Don't put amendments into comments, add the detail to your question and furnish the other things I mentioned too. \$\endgroup\$ – Andy aka Jul 15 at 10:13
  • \$\begingroup\$ The requirements Andy asked you about include things like what not only what voltages this isolation should protect against, but what the type of system that's coming from, for instance mains has 1500V spikes on it, and why, as medical or explosive atmospheres require better isolation than lab. \$\endgroup\$ – Neil_UK Jul 15 at 10:28
  • \$\begingroup\$ @Neil_UK Okay, done! \$\endgroup\$ – Alex Er Jul 15 at 12:06

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