Quote:
Originally Posted by techhelpbb
The high side current limit resistor is probably why they used the low side as the current going back up through the high side would heat that resistor. So that resistor makes the high side's path back to the battery positive less than ideal as long as it exists (even if the transistor remained fully saturated while it did that).
Trade off I guess.
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The current sense resistor would not be in the path of the inductive current if the high side were used for shunting
The inductive current would flow in a loop
: through the motor, through one pair of high-side FETs, then through the other pair of high-side FETs back to the motor.