Switching Regulator Component Selection & Sizing - Phil's Lab #71

How to determine and calculate appropriate component values for a switching regulator (buck converter in this example). Including sizing of input/output capacitors, inductor, rectifier diode, and feedback network.

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[TIMESTAMPS]
00:00 Introduction
01:08 Altium Designer Free Trial

01:51 Buck Converter Overview
03:32 Requirements Specification
04:16 Distributor Part Search

05:54 Maximum Switching Current

08:52 Inductor Selection
10:08 Effect of Switcher Parametsr on Inductor Size

11:54 Diode Selection

12:36 Input/Output Capacitor Selection

13:58 Feedback Network
15:18 Effect of Feedback Network Tolerance on Output Voltage

16:00 Schematic Implementation

ID: QIBvbJtYjWuHiTG0uCoK

[mgeo]

As an industry professional, I keep coming back to this. It's really useful for when I have to do something simple and cheap. Usually, I'm using big complex PMICs but this is a nice guide for a simple SMPS. Thanks!

[anilsuha]

This is great information. One request Phil. can you do a video on Input EMI Filter Design for this Buck converter. Not many information is available in internet. say if this converter Fails in EMC Compliance test. How can we solve the problem. What are the design considerations for EMI filter design. It will be interesting as well as informative. Thanks

[GIGEO]

Excellent guide Phil, goes into the right amount of detail needed for a proper implementation without getting lost into too much unnecessary theory. Thank you!

[jeffreydijkstra]

amazing amount of quality in these video's! can't believe this is free to watch.

[eleclab]

Your videos are very educative! And I like the topics that you usually talk about

[Avriox]

Excellent video as always! Up until now, I've always selected the components "by feel". Step by step your videos help me to build a better understanding of creating electronic circuits and who knows, maybe I'll be able to make acceptable designs one day ;)
Thank's for your work!

[Runningrse]

I wish I had this video about 2 years ago.

[jakobhalskov]

Would be awesome to see this circuit in real life, so we can poke around the switching node and output to see the switching characteristic :) I remember learning a lot from this, to get a more intuitive feeling of the workings, instead of just drowning in the equations! Other than that; yet another very informative video 🤞🏼

[Al-Brewster]

Thanks for this Phil. Very detailed. I'm currently designing a PCB in which I plan to implement a switching regulator component, so your explanation is going to be really helpful. I might even submit the finished PCB design for you to review

[_a_x_s_]

Good information. Now I can design a switching power circuit by using the existing “typical” application circuit. Thanks for that!

[nabeast]

i had to do a schematic for a buck converter at my internship recently and this definitely helped clarify some of the stuff that I did (per the datasheet) better! The graphic calculator playground tip is something I'll start using too

[nsrshgq]

The slide and the presentation is awesome. Thank you.
I need the slide and the schematic and PCB. Thank you indeed

[michaeldalby]

Great Video Phil - Thanks for producing some great and informative content

[khaledsaleh]

I'd be grateful for a video on the power supply for STM32H7 family. Thank you for great videos

[pnjunction]

Excellent video, as usual. Your presentation style is really great. I would love to see a video about some the theory behind the different types of compensation networks used in the more involved dc converter designs.

[anhkhoa]

Absolutely incredible video, great job!

[scottduckworth]

I recently designed my first SMPS PCB, and already ordered the PCB and components before I saw this video. I used the recommended components and layout from the AP63205 datasheet, but now I'm concerned that some components may be out of spec (low capacitance on the input/output caps, and low inductance). I do have an electronic load and oscilloscope, so I'm planning on testing the SMPS at various static and dynamic loads. What sorts of problems should I watch out for? Is voltage stability the primary concern? What about EMI?

Your channel is great! I have a software background with no formal training in electronics hardware design, but your channel and a few others have been amazing learning resources. Thank you!

[breedj]

I like these kind of video's with example calculations. I also hope you will create one testing this circuit and viewing some signals on the scope

[bartek]

Nice revision of the formulas. Cheers Phil.

[TYGAMatt]

Excellent presentation and great information. Very clear and easy to understand.