College - Author 1

College of Engineering

Department - Author 1

Electrical Engineering Department

Degree Name - Author 1

BS in Electrical Engineering

College - Author 2

College of Engineering

Department - Author 2

Electrical Engineering Department

Degree - Author 2

BS in Electrical Engineering



Primary Advisor

Taufik, College of Engineering, Electrical Engineering Department


The Conducted and Radiated EMI Measurements with Parallel Buck Converters Under Varying Spread Spectrum Parameters research senior project aims to explore the effects from Spread Spectrum Frequency Modulation (SSFM) on the input electromagnetic interference (EMI) or noise of a switching power supply, specifically with LM53601MAEVM hardware. The input EMI is important as the main input bus needs to be clean to provide a reliable source for other sensitive devices connected to it. SSFM can replace a conventional EMI filter and save weight, space, and cost. This project provides a basis in terms of the impacts of variable SSFM in simulation in order to provide an idea for its best application in future hardware implementations. The input voltage requirement for the buck converter is from 5V to 42V with output voltage of 3.6V and maximum output current of 1A. The buck converter should vary the percent modulation of the SSFM for up to +/-4%. Auxiliary circuits that will produce the necessary control signals for varying the percent modulation of SSFM were developed. Simulating LM53601MAEVM hardware with SSFM was not efficient as it required a significant amount of time and computational power. Overall, in terms of EMI, none of the simulations passed automotive CISPR standards, which is one of the potential LM53601 applications. The best results in simulation were at lower input voltages, mid-range loads, and low percentage of SSFM spread. Since EMI depends on layout, physical hardware measurements could provide further insight into the impact of variable SSFM.