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TPS562200: Output turn off before enable release

Part Number: TPS562200

Dears,

I measure Vin 12V、Vout 6V8 and EN pin waveform as below, I found when 12V power off 6V8 will turn off before enable release.

At 12V going down to 8.1V, 6V8 turn off start.

But figure.33 on SPEC showing the Tps562200 Shut Down Relative To VI, seems like Vo turn off when Vin under 5V.

So why 6V8 turn off before enable release and Vin not lower than 5V?

BR

Eric