so can I drive 2 ohm load? how many pairs are required at 45v and 80v to drive the 2 ohm load safely?
I would like to know also.
This is how I would do for IRFP240/9240 to drive 2 Ohm speaker.
I would use 4 pairs of MOSFET.
I would let MJE15030/15031 drive current to the MOSFETS.
I would not use too high voltage for the power supply. 45 Volt is enough.
While that is a good simplification, driving a MOSFET can take a good bit of current because of capacitance. But, like you stated, a triple emitter follower is overkill.Used Triple Emiter Follower for MOSFET is not necessary. MOSFET drive by voltage, BJT by current.
About using MOSFET on drivers for BJTs Power output, like IRF610/IRF9610, how value Rg is good choice? I think 100 ohms.
Technincally you are correct. Except for one little thing: It's spelled "emitter." There is no "emiter" on a BJT either.The same mistake... there is no Emiter on MOSFET devices, there is the Gate, Drain and Source terminals, so you say Source follower.