Building a better buck regulator, capacitor ESR / ESL, parallel resistors maths

Let's design a buck regulator a bit better than the Chinese makers do (including schematic). Let's also talk about calculations of resistors in parallel and about the problem of a high impedance (ESR, ESL) of electrolytic capacitors.

The previous video about the charger: https://youtu.be/D4RqBEBt7MY

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