Hi,
I have designed a 10Watt SMPS using UCC28600. My design is having lot of EMI issues and failing in radiated emission 30-100Mhz band. I used a 1K resistor in gate path for slow turn on of the mosfet and a reverse diode for the fast turn off. RE test passes if 1K resistor is used for the mosfet turn off also. i.e., remove the diode. But removing diode contributes the switching losses and lower efficiency of the SMPS. Mosfet temperature rises up to 90 degree C. Could you suggest any other solution to deal with the RE issue.
Best Reagrds,
Shalu Singhvi.