What is Reddit's opinion of Power Electronics: Converters, Applications, and Design?

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The Mohan Undeland and Robbins book is a really great reference with enough explanation to learn from scratch as well. (Also available in a very cheap international edition)

Honestly I don't have a good single book, just my course text books for my undergrad. I essentially took every digital and analog design course for my undergrad that was available. I had an absurd amount of credits completed by the time I graduated. These were my most memorable books.

1. Power Electronics by Ned Mohan. Really useful to know how power supply topologies function, especially since a lot of embedded systems design work is for digitally controlled power supplies. Boost, Buck, Flybacks, Forward, and Resonant LLC converters are especially common designs that are used everywhere.
2. Fundamentals of Microelectronics by Razavi. Teaches you basics about active components and circuit design. Transistors, diodes, amplifiers. At the very least you should understand how to bias a transistor, and use the basic single-stage transistor circuit designs.
3. Digital Design by Mano and Ciletti. Basics of how digital hardware design is done, how digital circuits work, how that scales up to computers and programming, and how ultimately any digital problem can be broken down into an actual circuit solution.
4. RTL Hardware Design Using VHDL by Chu. Knowing how to use VHDL may not be that useful, but I thought the course and text book were really useful in understanding how massive digital designs are done, such as microprocessors. Plus it really reinforced what I had learned in the digital design class before it. Knowing how to use FPGAs could very well be useful as their costs continue to come down.
5. Applied Numerical Methods for Engineers and Scientists by Rao. Really helped my Excel game, solving these problems, and using these methods in Excel and VBA.

Which one? He's got a couple This it? https://www.amazon.com/Power-Electronics-Converters-Applications-Design/dp/0471226939/ref=mp_s_a_1_4?dchild=1&keywords=ned+mohan&qid=1608632614&sprefix=ned+mo&sr=8-4

That.... that is not the job of a simple mosfet. It's also beyond my abilities so i can't explain the design process to you either.

Let's consider the hypothetical situation. We have an irlb3034 with a Vgs of 10V, our power supply has infinate current capability with no drop, and everything is connected with lossless conductors.

So when our mosfet is turned on it will have a Rds(on) of 1.7mOhms. I = E / R, so I = 8.4 / 0.0017, I = 4941.18A. But a mosfet is merely a switch, the load is what you want to switch and that dictates the current sunk through a n-channel mosfet. With PWM you're switching it on an off quickly giving you an average voltage, but a lot of factors come into play (mosfet dynamic characteristics) and i don't have the time to explain that all out.

Switching supplies are entirely different animals though, inductors are involved, diodes as well, physics as well. That's all beyond my skill set when it comes to rolling my own SMPS from scratch.

There are some books on it, however they tend to assume you already know a lot or have a formal education in electroncs. That and it'd coost you probably about 400 dollars for two books on the subject if you were to buy them new instead of rent them or check em out from the library.

Sorry i couldn't be of more help. And yes Vgs of 4.5V > is for switching instead of amplifying.

You'd be looking for books such as: http://www.amazon.com/Power-Electronics-Converters-Applications-Design/dp/0471226939/

http://www.amazon.com/Power-Electronics-Basics-Principles-Applications/dp/1482298791/

Along with a good background in general electronics and design.