Quote:
Originally Posted by Ether
Why would that make it even more efficient? All the FETs in the bridge are the same.
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"During the PWM_ON period, Q1 on the high-side and Q2 on the low-side provide a path that increases current in the motor."
Shouldn't this be Q4, not Q2 (for one thing it's a contradiction to the diagram on the next page, and for another it wouldn't make sense as it is written versus how an H-bridge functions).
On what I just proposed I'm not sure but it would seem to me that dumping that energy into the low side of the bridge runs the risk to mess with the lower side reference 'ground'. Since the high side would have to be driven higher than the supply to saturate the MOSFET anyway, because the high side is N-Channel MOSFETs, wouldn't it less risky to dump that energy to the side that is already able to exceed the supply rail which might shift down anyway? I mean might not a shift in the lower reference cause the lower MOSFET to not be entirely saturated?
Hmmm, might not matter, guess it would depend on just how not ideal the lower reference 'ground' really is.