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UCD9224: Seeking to use as a high-voltage (~600 to 800V) controller on a high-power system, using current transformers for current sensing

Part Number: UCD9224
Other Parts Discussed in Thread: UCD3040

Has anyone figured out how to use the chip this way, especially since Fusion Power Designer doesn't like input voltage values above 400 volts? I was wondering if it made sense to just scale the resistances of everything down when designing the power stage in Fusion and then use the resultant control coefficients.