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What limits the maximum RPM possible for the DRV11873?

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I'm using the DRV11873 to drive a motor with 12 pole pairs and with 100% PWM modulation the maximum RPM I can get is 1200 RPM. I need at least 1400. The FG is 241 Hz which would be 241x60/12 = 1205 RPM.  Am I missing something obvious? 


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