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Lower Side Shunt current Sensing

Other Parts Discussed in Thread: DRV8303

Hi,

I am familar with shunt current sensing directly on motor phases.

TI's DRV8303 application notes recommends schematics with shunt sensing on the lower-side of the half bridge.

I misunderstand the reason of this schematic in comparison with phase sensing.

Is there any known state of the art steps to properly reconstract per-phase currents from these measurements?

What should the start of conversion be synchronized with (i.e. what PWM event should trig the conversion) in this case?

Thanks