The degrading performance of high frequency DC-DC converters due to Electro Magnetic Interference (EMI) must be encountered utterly. Use of chaotic PWM is an effective way to reduce the EMI, by which the entire energy can be completely spread out uniformly over the frequency band. Since, the generation of chaotic carrier in practical cases is comparatively difficult, here in this work, chaotic mapping is incorporated to convert the periodic saw tooth carrier into chaotic one. The primary sources of EMI such as di/dt and dv/dt due to rapid switching were controlled significantly by the soft switching technique which is combined with chaotic PWM to suppress electromagnetic interference. This combined approach also results in reduced switching losses and hence ameliorates the efficiency of the boost converter. © 2014 IEEE.