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UCC28600: question about PWM modulation

Part Number: UCC28600

hello,

    i have a question about UCC28600 PWM modulation,need help,thank you.

questions:   POWER limit cycle-by-cycle voltage is 1.2V,converter to feedback voltage is 1.2V*2.5=3V,it meaning that max FB voltage is 3V, but in datasheet QR FB voltage range is 2.0V-4.0V, one is 3.0V and one is 4.0V , how to understand?