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LM5085 FB pin open

Genius 4840 points
Other Parts Discussed in Thread: LM5085, TS5A3359

Our customer is considering to use LM5085 with TS5A3359 (Mux) to select FB resistor.

Input voltage:12V

output voltage:5.3V,8.3V,10.4V

 At this test ,part is active and then they open FB pin,output  voltage rise to 12V(same as Vin).

Is this part behavior normal operation?

Regards,