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LM5117: after LM5117 UVLO, the output of LM5117 can not upon

Part Number: LM5117

Hi TI's Exoerts,

we used LM5117 as the buck controller, and  58V input and 24V output. The circuit diagram and test waveform are as follows:

channel 2 is 58Vin, and channel 1 is 24Vout. The input undervoltage point was set at 29V.

After the input voltage is reduced to the undervoltage point, the output voltage can only be 13V or 4V.

Please help to analyze the cause of this problem, and what needs to be modified?