I’m planning on building a motordrive that is based on the ODrive. For my application however, using a bootstrap circuit is not allowed. For this reason I consider replacing the high-side n-channel mosfet with a p-channel mosfet and invert the driving signal. The power handled by this motor driver will be very small so the larger Rds of the p-channel MOSFET won’t be an issue. Is there anyone that has any experience with using such an inverter that uses p-channels for the high-side switching. Do you guys think redesigning the odrive in this way is possible? Any thoughts are welcome.
I thought about the body diodes but I concluded that this wouldn’t be a problem since the polarity of the body diode in a p-channel MOSFET is the same and the body diode will still be present. What problems do you foresee?
I cannot use N-channels because using a bootstrapping circuit won’t be allowed for my application I cannot have a voltage higher than the supply voltage present in my circuit.
Oh for some reason I thought the body diode was the other way. Yeah should work fine then. Gotta find the right gate driver for it but otherwise no problem.
Good to hear, yeah I thought about which gate driver to use. For the n-channels I wanted to use the UCC27321. For the P-channel I was thinking about using the same driver since the low and high output voltages of this driver should also be able to driver the p-channel MOSFET both on and off. Is this a valid reasoning?