My problem is "how fast can an LM393 drive the gate of a small MOSFET"? At the moment the exact type of MOSFET isn't finalised, and even if it was I've yet to see a datasheet give a straight answer on the actual value of gate capacitance, if I knew that I could calculate the charge/discharge time with the minimum allowable 393 O/P pull up resistor.
One thing that would ease the problem, is if it is possible to wire the pair of comparators in parallel to increase the O/P sink capability, the alternative is to drive an external transistor to get more current - but the whole point of using the 393 was to eliminate a quantity of discrete transistors.
TIA.