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LM22678: Power management forum

Part Number: LM22678

Hi all.

According to the data sheet, the resistance is set as shown below, and 4.998V is normally output.
However, after a few seconds to a few minutes, the power goes down.

Vin   12V

Vout 5V

Ven  about 2.5V

R_ENT 80.6K


R_FBT 2.87K


The following schematic is for the LM22678.

Voltage Graph:

Please let me know where I made the mistake...