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
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!
The datasheet recommended component values worked out well for me. Parts arrived, and I assembled and tested it last night. Using a standard scope probe at 1X with the floppy ground lead, I'm seeing a 10mVpp ripple at 2.2kHz regardless of current. Under load steps between 100mA and 1A it's spiking +/-100mV but recovers within ~30us. Compared to my cheap benchtop SMPS, my PCB circuit exhibits lower ripple, lower noise, and a faster response to the dynamic load. I couldn't be happier for my first attempt at this!
16:00 - the video seems to be missing a few seconds there as you were talking about the precision of the resistors being important and it just stops midsentence.
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 🤞🏼
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!
Don't use larger capacitances than required on the output of a SMPSU unless you want to add a pole reducing the transient response. 10uF was the correct value to use.
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
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!
Here's what I would do. Seach Texas Instruments Webench. Select DC/DC converter. Type in your input/output requirements and then submit and select which one is cheapest with the fewest components. Then save the generated files. Am I missing something?
Is it okay to choose the same bulk ceramic capacitors (e.g., 47u) for both the input and output, even though the voltage rating should be different? For reducing the BOM count
How could I use the information you provided in this video to make this a Current regulator? I am trying to build a circuit for a fiber laser and I need to be able to variably output up to 10A. I am having a hard time with IC selection and figuring out what components would be best for this amount of power. I'm using a 12v power supply. Any ideas? Maybe a video like this one but for a switching constant current regulator?
Hi, great video and well explained as usual. I have one question about the requirements specification, for a new project how can I know what would the load current be ? I guess there is no formula to calculate it and I have to guess it based on the components in the circuit but is there any rule of thumb to follow while choosing an output current? Thanks in advance!
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
9:46 We calculated Lmin 22uH and we chose part with that value but datasheet says its tolerance is +/- 20%, so it is possible that actual value will be below our Lmin. Is that correct?
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.
Thank you very much. I've designed a board (that still needs to be manufactured) that I wanted to use to show how to design a control system (digital) for a buck converter. Hopefully that'll show some compensation techniques, albeit digital.
I have always HATED the back current flow in DUMB (vast majority) of synchronous bucks. The LT3800 is one of the RARE ones that fixes this. ANY THOUGHTS from your experience?????
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!
Heyy.. your vidio are amazing 👏 can you plz help me where can I start my journey of electronic ( PCB design ) from basic can u suggest me the best vidio yours where it will help me to create my own Flight controller 😅 waiting for your reply 😆😀
Does the footprint of the input & output capacitors make a difference here, assuming that the voltage and temperature are within limits of the caps? For example, if I can get an 0603 output cap that meets my requirements, is there any benefit to going with an 0805 of the same capacitance value? Just wondering why I often see larger footprint caps used on the SMPS than elsewhere on the board.
Hello, Could you make a video on how stm32 HAL works? Meaning why there are all these drivers , call back, macros and how do they connect all together. I'm sure there will be a lot of listeners.
Hi Phil, thank you so much for your really informative videos. I was wondering if you can make a video of how to obtains a CE certification for low voltage device, and in general what are the design suggestion/consideration to don't fails the EMC test.
Thanks, Remy! Larger sizes are easier to solder, probe, and will typically be available in higher voltage ratings. However, smaller packages will have lower (lead) inductances, which is important for certain circuitry.
Great video!! I have a question: How can you calculate point 2 @7:35 if your switching frequency isn't fixed as your case but rather variable depending on the output current as in the MIC2251 datasheet?
You'll have a nominal current that your design will require, so use that. Otherwise, design for the worst case (e.g. lowest current -> largest inductor).
You are one of my reasons to love the British accent. I like your voice. You look like a voice over artist. Could you tell me what is the difference between basic and extended part in electronics? I usually hear you in many videos say that this component is an extended part but I don't know what it is. Thank, Phil.
Thank you - I'm still waiting for someone to contact me for voice-over work however, I'm afraid :( Difference between basic and extended parts refers to the JLCPCB parts catalogue. On their site, for assembly, you pay a surcharge for using components that are not on their 'standard reels'. These are extended parts.
@@PhilsLab I appreciate your fear as a new step but don't make your fear control you. I hope you do well in this work. I really enjoy when I hear you, I bet that one day you will be a professional voice over artist, especially you have a powerful voice tone. I have understood that the extended part won't affect me in design except when I order SMT assembly, I will pay a surcharge. Is that right?
Did you ever get across audible noise on switching regulators? I had those issues with TI parts some time ago. Texas Instruments has a whole list of regulators with audible noise issues (even their EVBs). Maybe it's a feature for science fiction movies that you can hear electronic switching noise. MPS has a good online calculator for various values. The audible noise issue is also known to MPS however they really try to do their best to move the noise out of the audible domain. Not all switchers are affected from TI of course (they have a very broad range of switchers).
Surprisingly, I haven't had any issues with audible noise from switchers yet. I've used quite a few MPS and TI parts but haven't across noise like that.
@@PhilsLab FYI, I DIY'd a PCB yesterday using your guide lines for a 12v - 300V DC converter.... Wow. Practically noise free and without doubt the best I've made so far.
One thing i've never really gotten a good handle on is the voltage and size properties of a ceramic. If i can get an 50V 0603 1UF cap, why would i use a 6.3V 0603 1UF?
Price, temperature derating, voltage derating, size.. all considerations.. A 0.1uf 50v 0402, for instance, will (almost always) have more voltage derating than the exact same part in an 0603 package. Take a look at the graphs for derating, and you'll begin to see why choosing what you need, but not over-specifying actually ends up being the better choice.
