I'm looking to use a MOSFET to turn on a resistive path, precharging a capacitive load. I'm considering the Nexperia BUK9608-55B, but I'm having trouble determining what my operating point is on the SOA plot.
I'll be using this as a high side switch with a 30VDC supply, ~7mOhm R.DSon, 1 Ohm power resistor down stream, then the capacitive load (an inverter with around 14mF of capacitance). With those conditions, my inrush will be around 30A. So where am I on the SOA plot? Am I at A, because we're switching 30A, or am I around B because most of the voltage drop is over the power resistor?
If we're operating around point A, would it make sense to use a load switch IC instead of a discrete MOSFET, and use it's dV/dt limiting capabilities?
It seems like it really depends on turn on speed and how it is driven. I've been planning to use this NMOS with this PV driver (https://docs.broadcom.com/doc/AV02-0259EN). We'll be up at 7V so that should be enough to get sub 10mOhms.