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I think it is possible to synchronized all buck converters in parallel. You could use droop regulation on the feedback loop for current sharing. Duty cycle is too small if using fundamental buck. Recommend to use tapped buck converter to increase duty cycle.
Not quite understand the relation between positive and negative supply voltage for the FET Drive IC and the switching frequency of this driver ? Floating supply voltage for this driver is
DC voltage. Input signal is AC switching. Perhaps you need to post the circuit schematic.
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