I've come across a little problem here... I need to have a diode on the output of a high side switch, to prevent high voltage generated by a freewheeling motor from flowing back through the high side switch.
However, I don't want to use a diode as my load current may be well in excess of 5A, and even with a Schottky diode - the heat dissipation is unacceptable.
I'm looking for a low dissipation solution, so it looks like it will be some sort of active FET solution - but i'm stumped as to what sort of architecture. Using P FETs seem to present some issues, such as when the gate is pulled to 0V, the gate-source voltage could easily be exceeded and the gate destroyed depending on the voltage present at the source...
EDIT - I should clarify, the motor is a dual winding motor - hence when one of windings is powered, the other generates a high voltage, and one simply cannot shunt the high voltage to ground otherwise the motor is dynamically braked and stops spinning.
So another way I could word the question is - is I need to make it appear as so I have disconnected the slower winding completely from the drivers, when in reality I haven't.