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FB_OUT does not work in ADP8140

Good day!

Use the ADP8140 for IR illumination. Dimming is not required. The scheme is simple:


To check, they made a feed to the EN input of the meander with a frequency of 0.5 Hz.They made several copies and one fault at all: the power switch does not open. I look at the oscilloscope - at the FB_OUT pin, the level is 12 volts and does not change. What have I done wrong? I can not understand anything.

thank