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TPS63020: start up

Part Number: TPS63020

TPS63020 for 3.3V to 3.3V;

This is my waveform at start-up to Vin, I can't understand why there is a step at PGOOD before PGOOD reaches 3.3V?

and my PGOOD is connected to Vout with 4.7K ohm.  test for 0% load.

Rpg=4.7k ohm

CH1 (Yellow): Vout;   CH2:(Blue): PGOOD;  CH3(Pink):Vin; CH4(Green): EN

Rpg=30k ohm

CH1 (Yellow): Vout;   CH2:(Blue): PGOOD;  CH3(Pink):Vin; CH4(Green): EN

Rpg=120k ohm

CH1 (Yellow): Vout;   CH2:(Blue): PGOOD;  CH3(Pink):Vin; CH4(Green): EN

Rpg=1M ohm: