Award Date

December 2022

Degree Type


Degree Name

Master of Science in Engineering (MSE)


Electrical and Computer Engineering

First Committee Member

R. J. Baker

Second Committee Member

Biswajit Das

Third Committee Member

Yahia Baghzouz

Fourth Committee Member

Xin Li

Number of Pages



This Thesis reports the design, simulation, and layout of a switching power supply controller chip for a fly-back switching power supply. The controller chip was designed using ON’s Semiconductor C5 process. The resulting switching power supply using the controller chip consists of using various off-chip components such as a power MOSFET, transformer, and capacitors. The main components used in the integrated circuit include a bandgap reference voltage circuit which outputs a reference voltage of 1.25V, a ring oscillator having a nominal frequency of 5MHz, a high-gain comparator, and a buffer that can drive a 5pF capacitor. Under normal simulation conditions the reference voltage was 1.25V, power supply voltage was 5V, a normal operating temperature of 27°C, and a load current of 2.5A which resulted in an output voltage of 12.5V with a 350mV ripple voltage caused by the control loop’s hysteresis. The higher value of ripple in the output voltage was shown to be reduced with a larger, thus more expensive, filter capacitor. The output in this nominal case resulted in an average power consumption of the switching power supply of around 16mW while supplying more than 30W to the load. The Thesis reports additional simulation results including temperature being changed between 0°C to 100°C, the power supply voltage being changed away from the standard 5V, and the load current varying between 10mA and 6.25A. During all tests the integrated circuit performed well and under worst-case conditions an efficiency of above 89%.


Control Integrated Circuit; Flyback Power Converter


Electrical and Computer Engineering

File Format


File Size

5570 KB

Degree Grantor

University of Nevada, Las Vegas




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