If pin 1 is less than 1.2V then the regulator will try to output more power to the inductor L1 to increase the output voltage.
Giving the inductor more charge time momentarily =reduces= the time it is delivering current to the load, and vice versa. Putting that inside a feedback loop can be fun
The chip manufacturers have made made things easier over the years with cookbook designs, but there are still complexities involved that need to be fully understood. No matter what chip is chosen you need to grasp the very basics. The biggest key is understanding how the inductor works, simple looking part, but complex in understanding. It's the heart of the system that pumps the current! The biggest complex issue is understanding the feedback loop and compensation for loop stability. One needs to fully understand R, C, L interactions. Your instructor should be concentrating on your first understanding this as opposed to a cookbook design.
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