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LM3478: FA/SD pin open

Part Number: LM3478

Hi

We would like to confirm the behavior at the following abnormal case.  

1. FA/SD pin is open when it startup.

2. FA/SD pin become open during the normal operation.

I think the FA/SD pin does not have internal PU or PD resistor. So that, this device is unknown operation if the FA/SD pin is open. 

Could you give us any advice about the above behavior?

Regards,

Koji Hamamot