I am using an LT3791-1 as a battery charger of 2 12V lead acid batteries in series with an Rt=82kOhm, and L1=10uH. I have seen issues with EMI noise in the range of 40-60MHz.
What is you suggestion to lower the EMI issues on this frequency range for the LT3791-1?
EMI can be complicated with causes from component choices to board layout. It is very design dependent. I recommend that you contact ADI FAE in your area to help you out.