For beginners it is super annoying that many tutorials say "there is a magical switch or oscillator here which is integral to the function of the boost converter, but we will not tell you how to actually realize it". Additionally, that needs to work at the voltage level you are starting out from and in many cases should be galvanically isolated from the converter. This is a lot to keep in mind and it is actually not trivial.
The answer here is usually to find an IC that works at your desired input voltage or to have a linear regulator provide a small amount of power for the PWM generator. Also be wary of just running with an AI generated answer. Claude 3.5 Sonnet suggest you connect an Arduino straight to 230V and after some back and forth generates circuits which contain strange elements like "antiparallel diodes" which makes no sense.
The TI Power Designer[0] is a great resource. Obviously it will only show you TI parts, but it's very helpful to get a base design. You can filter by complexity (roughly BoM count), size, cost etc based on the parameters (input voltage range, output voltage range, power etc). The designs usually have a reference layout as well.
It is a very hairy cow, which likes to bite and is stuck in the mud. Also it has a wierd high-frequency response. There is a description of tractors to get it out, but we'll skip how the controls work for now.
The answer here is usually to find an IC that works at your desired input voltage or to have a linear regulator provide a small amount of power for the PWM generator. Also be wary of just running with an AI generated answer. Claude 3.5 Sonnet suggest you connect an Arduino straight to 230V and after some back and forth generates circuits which contain strange elements like "antiparallel diodes" which makes no sense.