I created a small PCB design using a switching power supply part number TPS61200DRCR with a 4.7uH inductor LQH3NPN4R7N0L. The inductor is rated at over an amp but but design only draws 40mA. For some reason the supply sounds very noisy. When I blink and LED I can actually hear the supply on every blink. Today I'll view the output on a scope to see if it measures noisy as well. The input and output capacitors are all the correct values according to the data sheet. Has anyone ever seen this before?
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