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LTC3109 shunt harvesting

Dear all,

I made a pcb design to harvest energy from a voltage drop (>20 mV) that occurs in a trace i have in my PCB. This trace carries 2 A and runs on the bottom layer.

However, it does not work. Has enyone tried this already? Could it be that the LTC3109 is afected by the magnetic field generated by the high current underneath? I didn't find any information about that in tha datasheet ... Thanks!