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LDC0851: EVM with two external 10uH inductor, LED does not change when metal gets close

Part Number: LDC0851

Hello Team,

We are testing LDC0851 with external 10uH inductor as shown below. C4 is removed.

I am not sure why the inductor seems to become only sensitive to hand touch.

It seems that metal target cannot change the LED light.

May we know why?

Thank  you.