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LM5026: Why the REF pin output 5V

Part Number: LM5026

Tool/software:

Hi Expert,

I tried to simulate the LM5026 with PSpice, the UVLO pin is connected to ground as shown bellow. According to the datasheet, the LM5026 should be shut down, but why the REF pin output 5V?

Thank you in advance for additional information.

Regards,

Jonathan