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I am building a switching time tester to test the p channel mosfet. I am thinking of using an IXDD414 with the gnd connected to gate and the out to source. I'm not sure if this will work, I've had problems in the past floating driver chips. I'm going to use an opto to isolate the pulse from the driver. I believe I posted the specs in the first post.
You rather should connect a non-isolated gate-driver IC with VCC to source and GND to negative supply, using an inverted input signal. I don't expect any specialized P-channel drivers to be availalble. Or design your own.