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TPS63020-Q1: VFB spec

Part Number: TPS63020-Q1


TPS63020-Q1's datasheet describes 2 kinds of VFB spec in P.5, one is at PS/SYNC = VIN and the another one is at PS/SYNC = GND.
Why are the specs defined separately?  PLS tell me the reason to separate and the reason why the VFB spec at PS/SYNC = GND has wider range.

PLS also tell me the reason why the VFB at PS/SYNC defined with using percentage, -0.6% of 500mV for min and +5% of 500mV in max.

Best Regards, Taki