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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.

Regards,

Ting