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LM3489: LM3489 protection issue

Part Number: LM3489

Hello

        Please refer to below waveform. While load increase to 0.5A, 5V output voltage will be pull down to 0V. Could I know what is the issue root cause? Thank you.  

  Ch1: Input , Ch2: output

Ch1: MosFET Gate , Ch2: output , no-load

Ch1: MosFET Gate , Ch2: output , load: 0.5A

BR

Patrick