I have the following P-ch MOSFET switch used to supply a 12V, 6-20A load:
When I enabled the switch, I measured the following voltage drops across +12VDC & +12VDC_GR. The yellow line is +12VDC (my source voltage) and the blue line is +12V_GR (my 0.5ohm load). As you can see, the +12VC has a sudden drop followed by a ripple.
I assumed this was caused by inrush current on my load, but when I removed the load and tried it again, I got an almost identical result:
I'm hoping someone in the community can give me some insight into what is going on/fix the issue:
- Is this actually inrush current causing the issue or something else to do with the MOSFET?
- Would adding a soft start between P-Channel gate and drain do anything to mitigate this? I'd like to understand the actual issues going on here.