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Split cap on LT3045

Hello,

I am using LT3045 for low noise power supply generation. Following the PCB layout guidelines I used the "split caps" technique for the output capacitor. I understood that this is a sort of Kelvin connection, but I cannot fully explain the physical reason behind the high frequency noise filtering, as said in the UG. Can someone give me an explanation?

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  • What is meant is that you physically separate the PCB pad into two pieces such that noise on one of the halves does not travel to the other half. If there is noise present in the connection between the IN cap ground pin and the OUT cap ground pin, the extra impedance from the split will reduce the amount that goes into the connection between the SET cap ground pin and the OUT cap ground pin

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  • What is meant is that you physically separate the PCB pad into two pieces such that noise on one of the halves does not travel to the other half. If there is noise present in the connection between the IN cap ground pin and the OUT cap ground pin, the extra impedance from the split will reduce the amount that goes into the connection between the SET cap ground pin and the OUT cap ground pin

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