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You can't figure out how long your switch is going to have to be on without knowing what current the load draws! Remember, the physical idea of your converter is "charge the field in an inductor, exa …

So, yes. If you want to generate a negative supply voltage from a positive one, you will need an inverting switch-mode power supply. Both your solutions seem to be an implementation of that. No one …

Does that mean I will need a converter to lower the voltage output but my question is what happens with the load's current draw? Yes, unless you want your motor speed / dynamics defined by how fu …

Then, for the +25V, normal buck controller, and for the -25V, negative output buck: I'd have to admit that I've never done a negative output buck with significant currents – however, here's an application … Note that this might or might not work with every Buck controller out there – you should ask in the manufacturer forums if you want to build this with a different controller IC. …

RDS_on and V_F describe the same thing, but different aspects of it: V_F is the approximate voltage across the semiconductor junction when the nominal operative current has been reached, acting as if …

You could use a more expensive but more efficient buck converter instead of a linear voltage regulator, but "5V arduino" kind of implies "not power efficient" to begin with, so my guess (!) …

existing buck converter / controller ICs. In your case, the low-power IRL2104 implies that even the very classic ICs will do that at a much lower cost, probability of failure, complexity. … In other words the question "how to build a buck converter with a 555" is as far as I can see answered by "use the 555 as decoration only, and design a proper buck converter without it", just as "how …

Generally, not depending on your software being bug-free for not burning your MOSFET, inductor or whatever device you're driving with the supply is a big plus for using readily made power supply ICs. …

You can typically use a much larger inductor than minimally necessary to store the energy for the downconversion; this usually only has positive effects.

You will be out of luck. Modern SMPS systems use a high switching speed, which simply won't work reliably with the high stray capacitances and inductances of breadboard. Many things you can prototy …

Ferrite beads are typically used to filter out RF noise, in this case most likely noise coming from the SMPS going into the power source. For lower frequencies, they have L00, but RF has the unfortun …

You're doing it backwards if you're trying to SMD-mount these modules: You get Wireless and high-speed boards with castellated edges, because it's easier and cheaper to make one small board with many …

No general statements can be given. Generally, the larger the input/output voltage ratio is, the smaller the efficiency for basically all converter topologies. However, whether you end up with 70%, …

A buck converter is the right choice here; don't know where the impression these would need a lot of space; there's many that need exactly three external components (an inductor and a capacitor on the … I personally wouldn't force myself to design that tightly, but I'd think that with a SOT23-5 Buck IC, 0603 decoupling on the input, 0805 on the output, and 0402 or 0201 resistors, you'd end up with less …

Generally, yes, you can build a switch-mode power supply using a microcontroller. It'll certainly be more work than just buying a dedicated controller IC, though, and your digital control scheme must …