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UC2854B-EP: Enable threshold voltage

Part Number: UC2854B-EP

Hi TI-team

My customer is using UC2854B-EP.

Normally, I think ENA operates at 2.35V or more.

However, there is a sample that operates with ENA around 1.9V.

VCC at this time is about 10.5V.

Vref also outputs 7.5V.

Why does the IC operate even when ENA is below the threshold ?

Under what conditions will it occur ?

Please tell me.

Best Regards,

Koji Hayashi