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LM5123-Q1: UVLO voltage keep drop when sinks till device shut-down

Part Number: LM5123-Q1

After start-up, voltage at UVLO/EN about 12V (I linked it to Vin, much higher than the UVLO threshold) but voltage here will keep drop till shut-down the device. 

In datasheet, current sink internally should disable when voltage above threshold so the voltage should not drop this kind. please help to clarify this behavior. thanks