The PWM will act as a switching to the buck-boost converter. The output will be control by an adjustable resistor or variable resistor and the PWM circuit. The main components are LTC3115-1 for buck-boost and 555 Timer for PWM. The PWM have on state and off state modes. The ratio or duty cycle between this two can be control. Therefore, the student will study the effect of PWM in the output voltage magnitude of the buck boost converter. This will make a better understanding on how the buck-boost converter actually works.
The LM555 is a highly stable device for generating accurate time delays or oscillation. Additional terminals are provided for triggering or resetting if desired. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For astable operation as an oscillator, the free running frequency and duty cycle are accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output circuit can source or sink up to 200mA or drive TTL circuits.
The LTC3115-1 is a high voltage monolithic synchronous buck-boost DC/DC converter. Its wide 2.7V to 40V input and output voltage ranges make it well suited to a wide variety of automotive and industrial applications. A proprietary low noise switching algorithm optimizes efficiency with input voltages that are above, below or even equal to the output voltage and ensures seamless transitions between operational modes.
Below are the datasheet about the main components:-
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