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TPS2384: TPS2384 internal reference voltage 3.3V (V3.3 pin) has unstable trouble issue with slow rolling.

Part Number: TPS2384

Support Path: /Product/Development and troubleshooting/

TPS2384 internal reference  voltage 3.3V (V3.3 pin) is unstable with slow(roughly 20sec) rolling from 3.3V to 3.9V on my designed board.

Its TPS2384 circuits schematics is completely same with TPS2384 EVM(Evaluation Board).

Please teach me the reason why these funny trouble phenomena has occurred, and how to solve these issue.