Gents,
I've seen several app notes showing using complementery N/P channel fets to drive a brushless DC motor with a low bus voltage (say 12 - 80VDC).
I have an application that has a 150Vbus. Is there any reason I could not use a 250 - 400 watt P-channel with appropriate currnet rating?
Id the appnote stop at 80 volts because the P-channel devices of the time were wimpy and not desired?
I know I could use all n-channels but the floating gate drive is getting to be problematic due to the long duty cycles. It can be done and I'm investigating a small footprint solution.
My problem is that the application is at very high temperature (>150C) and the standard "easy" answers don't work. (IR2110 or optocouplers). The next step is gate drive driving a carrier through the transformer and demodulating it on the other side.
Seems like if it could work, a P-channel high side drive would be a better choice.
What are your opinions on complememtary motor drive for a 150Vbus brushless motor driver.