High side P-channel mosfet switch for BLDC driver (42V ~13A at peak)
simulate this circuit &ndash; Schematic created using CircuitLab
There's a couple issues that I see. One being that your Mosfet is only rated for 13V higher than your rail. With that amount of current plus an inductive load, you are likely to see voltage spikes well above that. The second being that your mosfet is going to turn on very slow due to the large gate resistance that it has. That large of a gate resistance will likely generate a lot of heat because the mosfet will be in the active region for a longer period of time.
The option that I included is a little bit more costly but it avoids using a P-Channel and is a standard way of using a N-Channel as a high side switch. I also picked a slightly higher voltage mosfet (100v) but you may still need to go higher than that. This uses an isolated DC-DC to reference the isolated gate driver and the source of the mosfet to the same potential which allows you to use the N-Channel as a high side switch. I know this isn't exactly what your question is, but I though it may be useful to know that this is also an option.