DER-507 EMI fails
I'm working on non-isolated switcher based on DER-507 design, the output voltage is correct ( 5V ) and in my application the output current is approximately 20mA.
So I did the EMI test, I tested my custom board in no-load condition and in normal use condition but it failed in any case, the only different with DER-507 desing are component layout and free wheeling diode D2 that has a recovery time >75ns.
I know it's difficult to have a fully correct answer, but do you think the wrong recocery time of free wheeling diode may cause EMI test fault ? Or do you think is only a layout problem ?
I am attaching the test charts.