The Most Versatile Voltage Converter you never heard of! The (S)EPIC Converter

День тому

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In this video we will be having a closer look at the SEPIC voltage converter. You probably do not know it, but most small Buck Boost Converters are in fact SEPIC converters and for a good reason. I will show you how the SEPIC converter works, why it is "(S)EPIC", how you can modify it with a coupled inductor and how to make a DIY version. Let's get started!
Websites which were shown/mentioned in the video:
www.we-online.com/catalog/en/...
www.onsemi.com/pub/collateral...
www.ti.com/lit/an/slyt309/sly...
datasheetspdf.com/pdf/1096363...
datasheet.octopart.com/IPD088...
www.ti.com/lit/an/slyt411/sly...
www.all-electronics.de/wp-con...
www.digikey.de/en/articles/co...
www.ti.com/lit/ds/symlink/lm2...
Thanks to JLCPCB for sponsoring this video.
Visit jlcpcb.com to get professional PCBs for low prices.
0:00 SEPIC Converter?
1:54 Intro
2:29 How does it work?
5:20 Advantages of the SEPIC
6:05 Secret Coupled Inductor Hack?
9:21 Which SEPIC should you buy?
9:49 DIY SEPIC

КОМЕНТАРІ: 380

@jostsalathe Рік тому

I once tried prototyping a 1A buck LED driver that operates at around 1 MHz on a bread board. This ultimately drove me to begin my bachelor's degree in electrical engineering because I had no idea why the heck this just wouldn't work! Today I do know why... =D

@After_Tech_Industries Рік тому

What wasn't working? I presume that it might have been the frequency; but I still want to know!

@jostsalathe Рік тому

@@After_Tech_Industries To be honest, I never actually checked what was the problem. So "Today I have some ideas why" would have been more correct. I think the main reason was the high contact resistance in the bread board contacts along the high frequency, high current path. I think the losses there probably screwed up the feedback loop of the regulator. Another probable problem was that the MIC2301 driver chip that I used has an integrated high side switch and therefore its SOIC8 package has an ePad at the bottom for cooling. The SOIC adapter board I used didn't connect to that, of course. I think it then also overheated way more quickly than I expected.

@rhodexa Рік тому

What I like about this design is the "self destruct" protection capability: One of my biggest fears when using Buck Converters specifically is that, when the switching transistor fails, it will most likely go shortcircuit (which in buck converters means the full input voltage will get to the output) destroying the load with overvoltage. In contrast, this design will not only let the voltage go low but also may just blow a fuse or trigger an overcurrent protection. This feature/bug is also present in synchronous buck converters: if one transistor fails, as soon the second one turns on, the whole thing will just go shortcuit and trigger a protection system before the output voltage can get high enough to kill the load. But maybe I've too much of a green mind for a disposing culture society?

@Teth47 Рік тому

I was researching the different topologies to decide which one to design a low-voltage DC UPS around, and kept hearing that SEPIC is unstable against transient loads. It'd be interesting to see a video on how different topologies react to different types of loads.

@FreeTheUyghurs Рік тому

Hey sounds like the situation I found myself in too! Surprised there isn't more commercial options around this given how often you'd think home users would just want an uninterrupted DC power source for their home network and other DC-powered electronics. My setup at the moment is a small server rack with a 15V DC PSU and a 12V Lead Acid battery (+ battery tender) with their ground connections tied. The output voltages are separated by diodes, thus creating a sort of "OR-ing" device. That gate's output is connected to a powerpole rigrunner so that I can split all my components to separate SEPIC converters to ease the change in load and to also not have a single point of failure. So far so good but then again I'm only running raspberry pi's, switches, and a router at the moment.

@kenmore01 Рік тому

My experience is any SMPS will be unstable with transient loads. Go ahead and use one, but either have a huge cap, a battery or some other stable transient source to keep it from blowing out your electronics, or add a linear low-drop-out regulator at the end. It could even run saturated for low loss, but will prevent the voltage from going too high. That said, I suspect this SEPIC is worse than most SMPSs.

@profdc9501 Рік тому

Many power supplies are based on a dual control loop topology, with an outer loop with conventional voltage control PWM and inner loop based on current mode control. This tends to protect the power supply against transient loads, especially short circuits and the like. Something like UC3843 and like series of chips may be more stable with a SEPIC converter. There is a sense resistor in series with the source of the switch to control switch currents, and there is an outer control loop that senses the voltage.

@Teth47 Рік тому

@@chaosdragon6718 These are the reasons I moved away from SEPIC topology. I'm currently exploring flyback and push-pull, but stepping from designing buck converters to these more advanced topologies is pretty daunting.

@k4be. Рік тому

There is also a four-switch buck-boost converter. Maybe look at BQ25713 for an example.

@oddjobbob8742 Рік тому

I don’t think I understand more than a small bit of your UKpostss but I watch and rewatch and even if I never understand I enjoy your drawings as much as anything. So clear. Your UKpostss are art.

@seanman6541 Рік тому

SEPIC converters are great for applications where the output power is low. For higher power applications, there is the two-switch non-inverting buck-boost converter. It is simply a combination of a buck and a boost converter. When the input voltage is higher than the output, it holds the “boost” switch open and modulates the “buck” switch. When the input voltage is lower than the output, it holds the “buck” switch closed and modulates the “boost” switch.

@yeyuan6273 Рік тому

it will be priblematic in between, .....

@vishnustechcorner3881 Рік тому

Your videos are truly informative. It provides me with a lot of electronics knowledge as a hobbyist. Keep going. Also get well soon. You are great, scott :)

@greatscottlab Рік тому

Thanks a ton

@vishnustechcorner3881 Рік тому

@@greatscottlab I'm so glad that you replied to my comment 😊

@jclowe735 Рік тому

@@greatscottlab what is the amps of this and could I safely use something like this with a 12 volts 20 watts solar panel?

@manoelbrasileiro1127 Рік тому

Sure, they're very nice. But I think there's an error on the schematics presented for the DIY SEPIC (on 10:20): there's no connection to gnd for Q1 (and L2, C4, C5).

@ChristopherOYoung Рік тому

Another great video.

@dianeattaway8733 Рік тому

Your videos are delightfully concise with surprising details and always inspire greater things

@mitsos306ify Рік тому

Another great video! What I always love , is the use of paper, pen and markers!

@rougenaxela Рік тому

Some years ago I designed and built my own SEPIC converter, and used an off-the-shelf part for coupled inductors with one core. Before I built it, I actually did simulations of coupled vs separate inductors and it helped the ripple out a bit. Once built, it worked quite well. My board also included a Ćuk converter which is basically when you take a SEPIC and swap the placement of the second inductor and diode, resulting in a negative voltage with very similar specs. Made for a nice stable+versatile bipolar +-12V supply.

@kenmore01 Рік тому

Great video Scott! I suspect your ferrite toroid had issues due to saturation, due to the uni-directional currents in it. Either add a small gap by using a multi part core, or go with high permeability powdered iron.

@johntoe6127 Рік тому

Nice video. I've been using these buck/boost converters in my projects for several years. They work great, and allow you to use almost any DC cube power supply without worrying about input voltage.

@electroinduction1512 Рік тому

Ah yes another great scott video! Awesome video,very informational about the sepic convertor!

@greatscottlab Рік тому

Glad you enjoyed it!

@andrebartels1690 Рік тому

Although I'm not an electronics guy, I like your videos a lot, because they are very informative and understandable.

@basviel6288 Рік тому

Thanks for All your video's. I have a SEPIC converter in Simulation program LTCad XVII. But NO matter WHAT i do, the current through the LOAD is Reversed. Till I saw this Video ! With D2 connected between Vcc and GND. NOW it Works ! Great Scott !

@Niels_Dn Рік тому

I love using SEPIC in my designs. The biggest benefit is that they are inherently failsafe, there is no fault mode in which the input voltage can be on the output. Also if you need positive and negative rails, you can use the same regulator chip for SEPIC and inverting.

@MD-vs9ff Рік тому

C1 fails short.

@Niels_Dn Рік тому

There is a chance yes, but if I remember correctly from Siemens’ SN29500 the chance is relatively small. And then you can split up C1 to make the design even more robust.

@jlucasound Рік тому

Hi Scott! Thank You for all the GREAT videos!! :-)

@FadiFadi00 Рік тому

Love your videos, it’s so simply explained yet very informative, I wish you could make more videos of coupled inductors since it’s a rare topic on the internet!

@fcvgarcia Рік тому

Great shot, Scott!!! Thanks.

@dragoscucu3128 Рік тому

Also USB 1-30V CC CV converters are using SEPIC topology. They are really handy to use, but the efficiency is about 60%

@eDoc2020 Рік тому

I'm looking at the schematic with coupled inductors and it appears if you remove the coupling capacitor you end up with a flyback converter. It just goes to show that all the different DC-DC converter topologies are actually very similar in operation.

@Harish-gv5jm Рік тому

Eagerly looking forward for next episode of "Diy or buy" as frequency modulator ( FM radio)

@melplishka5978 Рік тому

Your definitely one of the most intelligent you tubers lol. Live your channel. When I finally get my parts replaced and back too work I’m definitely funding your channel lol. Ty for your time and research my friend.

@greatscottlab Рік тому

Awesome! Thank you!

@farosrohmangeloraramadan3897 Рік тому

@@greatscottlab Next project Cuk Converter pleaseeeeee

@BRUXXUS Рік тому

It’s kind of amazing that buying two inductors is significantly cheaper than a single coupled one. I suppose there’s just not a big enough market for them to compete on price, huh? Super cool video! Especially the DIY circuit at the end.

@kenmore01 Рік тому

Winding a single is much easier than winding a dual with most winding machines.

@dunghowproduction5238 Рік тому

Sir i love your hand writing

@user-tz3fd8hm4q 3 місяці тому

I actually built a SEPIC converter on a perfboard recently. It can output up to around 50W of power and comes with an efficiency of around 80-85%. Anyway, great and educational video!

@lincolnschoolpreservation3574 Рік тому

great info on this circuit n components. also new look, i also like the facial hair look.

@thatAlex1337 Рік тому

I would love to see a video about vacuum flourescent displays!

@GowrishankarLeGrand Рік тому

Informative as always! Thanks mate!

@SoloRenegade Рік тому

You have some of the best electronics videos.

@greatscottlab Рік тому

Thanks :-)

@ilankotzin3104 Рік тому

Excellent video, Scott!

@CableWrestler Рік тому

Outstanding videos in every aspect AGAIN. I truly respect you.

@greatscottlab Рік тому

Thanks mate :-)

@chaosdragon6718 Рік тому

For higher currents, a 4 switch buck-boost will always be the better solution. SEPIC (as well as inverting CUK type ) switches VIN+Vout on its switch node and carries the large du/dt EMI problem. And you switch more current than Iout. That to a much larger Hot loop which includes the SEPIC coupling capacitor. In essence, you store the complete transfer energy in the inductive components so those inductors have to be sized that way.

@sampathrocky4694 Місяць тому

So informative , Thanks a lot man

@y2ksw1 Рік тому

This is without doubt a very useful project

@greatscottlab Рік тому

Glad you think so!

@AhmedSoliman-qo6gq Рік тому

You generally need lower inductance if you used a coupled inductor. It isn't just the efficiency but also space reduction :)

@PhG1961 Рік тому

Awesome and very well explained. Great Sunday afternoon entertainment !

@greatscottlab Рік тому

Awesome :-)

@thomasschellekens5084 Рік тому

Hey, your voice sounds like you are (recovering) from sickness. I wish you the best!

@rocketsmall4547 Рік тому

thx for ur videos. will watch

@GuianLorenzo 2 місяці тому

( 1:21 & 6:22 ) I have used a SEPIC voltage converter that uses a coupled inductor and it has some decent efficiency and also has some protection features which is nice. The only concern I have is the EMI it might be producing specially I used mine on an audio amplifier build and it has some weird issues "sometimes" specially on its aux mode, might have to some tests on it to confirm those thingies.

@sanjikaneki6226 Рік тому

nice, often i see boost buck and sepics being combined IC that efficiency seems low tho at 60% a LDO may be better ( if it is lowering) Also maybe make a video about the energy efficiency of all those converters .

@karakson Рік тому

Perfect video! Thank you!:DDD

@paulfontaine7819 Рік тому

Great video Scott. I learned a ton. Next week your prototype PCB will be shipped by your sponsor JLC PCB I guess ;-)

@TheShedevri Рік тому

Very good video Mr Scott.

@Nono-hk3is Рік тому

The SEPIC buck-boost design is more elegant than I expected it to be.

@yashdodia8048 Рік тому

I am your big fan great scott

@jafinch78 Рік тому

I'm thinking the Prof. Slobodan "Cuk" converter deserves a thorough review. Somewhere I have my first power supply kit I built, a SEPIC-Cuk split rail design to emulate a low power computer PSU and I'm trying to recall what specifically. Man, I forget, seems like something maybe SDR related though I forget. Neat design.

@jafetmartinez3898 Рік тому

Great video. Can you compare the SEPIC with the non inverting buck-boost to see which one is mor efficient? Thanks.

@PeetHobby Рік тому

I think you can build a boost converter circuit on a perfboard but you must put the components much closer together, the distance you use wouldn't work properly on any PCB type I think. All datasheets of switching power supply IC's are always hammer on that you must keep the loops as short as possible.

@huseyinozsut9949 Рік тому

I found a moderately high power (5a or 60w) buck/boost converter. What I found was a decrease in efficiency, increase in heat. My aim was to power 4g modem/router on boats, which operates in high temperatures (on sea, on summer, in Turkey). Boats are like cars, while engine is running voltage contains lots of jitter due to charging alternator. And just like cars, in small boats there is not a service battery, which means while engine is not running voltage is 12v. While starting the engine, voltage can drop down to 10v. While engine is running, there is a lot of noise (or jitter) and voltage is 14.4v. My solution was to use two coils, then a group of capacitors then a boost converter (increases the voltage to 15v) then a buck converter (reduces the voltage to 12v). 🤣😂 This devides the heat dissipation, reduces the jitter and just works... But in lower power applications (like 1-2amps) buck-boost converters works very nice.

@adamrak7560 Рік тому

This is a bit silly because the 4g modem/router internally has buck converters, which you obviously cannot get around, so you are forced to use this roundabout way. High freq, and highly integrated GaN buck-boost would have worked for you well, but this tech is not very widely available yet, and probably more expensive than chaining two very simple converters like you have done.

@ccoder4953 Рік тому

I have alot of experience with SEPIC and Cuk converters. Coupled inductors are great. They can be more efficient (alot of variables there though), they have better dynamics (dual inductor SEPICs and Cuks have some high frequency resonance that can make compensation harder), and the overall solution size can be smaller than for dual inductors. What I've seen is for name brand (like Coilcraft and Wurth) inductors, prices are comparable between two singles and a coupled. But the market for singles is bigger, so its easier to find other manufacturers of singles. Also, worth pointing out that I've heard Dr Cuk is adamant that a Cuk converter built with a coupled inductors isn't really a Cuk converter.

@Blox117 Рік тому

lol "cuk"

@ccoder4953 Рік тому

@@Blox117 It's named for en.wikipedia.org/wiki/Slobodan_%C4%86uk . Funny name perhaps, but he's Serbian, that is his name, and that is indeed what it's called.

@triffid0hunter Рік тому

@@Blox117 Apparently it's pronounced 'chook'

@Blox117 Рік тому

@@triffid0hunter oh i see, there is an accent mark

@yeyuan6273 Рік тому

dude, the sepic is noesing as fk, but i have to use it, how to reduce the ripple to 5mv under 12v at 3a? i have tried everything........rc lc re apsorbtion, comm choke, what i did wrong? it keep around 100mv at 1a ar 12v, i cant knock it down further.......

@stevenA44 Рік тому

Interesting. Do you have a video on that device with the display and the fan/heatsink?

@MCsCreations Рік тому

Fantastic video, dude! Thanks a lot! 😃 I'm definitely going to look around for those!!! Stay safe and creative there! 🖖😊

@greatscottlab Рік тому

Thanks! You too!

@donlorinsharp Рік тому

Hello from Georgia, USA! I really appreciated this video. I do have a question that I would like to ask. I'm adding heated seats, grips, gloves, and primary clothing layers that will run off of my bike for cold weather riding. The bike has very little extra power so I'm changing all of my lights to LED and I want to use a solid state timer for the signals rather than simply adding resistors to prevent hyperflash. Most of the heated element controllers use a resistor for the lower temperature settings. It seems to me that I could use one of these boards to control the temp and actually conserve amps by using a lower setting If my gauge showed a constant draw on my battery rather than a 2a or so charge. Am I right. I'd use the FP5-139 to get the most out of each amp put out by my charging system.

@andreiflorea3865 Рік тому

Hello Scott, how you made your beginning perf board logo? You connected your LED's in parallel or series?

@onjofilms Рік тому

3:00 your Bosch washing machine is done.

@StanleySeow 9 місяців тому

At 9:33, what is the name of the converter module you recommend ? There were no text on the video and I can't see it from the video alone ...

@try-app Рік тому

Great.. too much information..i learn new..thanks a lot for such a good video..

@Redbuild_ Рік тому

Greetings from Germany and from southern part of Bayern

@greatscottlab Рік тому

Greeting back ;-)

@rudigernichtsotief4554 Місяць тому

There is a great document from Recom that explains all the topologies. There I learned about the coupled inductors. Somebody who klicked this video is probably interested in that document.

@lrrromicronpersei8294 Рік тому

Nice job 👍

@MikeKranidis Рік тому

Very informative video, congratulations! I can't find the link for your chosen convert, can you give me here. Thanks.

@mohammedmariff9034 Рік тому

hi scott did you make board with automatic li on charger with load sharing or power path function ? powering your project automatic while its connected to 5v usb and without damaging battery

@handlesarefeckinstupid Рік тому

Very interesting. Thanks for the content.

@greatscottlab Рік тому

My pleasure!

@matthewday7565 Рік тому

I'd guess that a specific boost or buck circuit is more efficient, to take a simple example in a 12V to 24V boost, half the output power is coming directly from the input, while it's a bit less than half in a 12V to 5V buck

@trygvetveit4747 Місяць тому

Love your channel! qestion: can you make a cheap/ceapish "garden light mppt "low Voltage battery/supercap?

@altaherhmad2266 Рік тому

Nice work👍

@allthegearnoidea6752 Рік тому

Very enjoyable video. Best regards Chris

@greatscottlab Рік тому

Glad you enjoyed it

@chillydickie Рік тому

awesome. use this all the time. finally learned how they work

@greatscottlab Рік тому

Great to hear!

@johnshaw359 Рік тому

The LM based ones works fine down to 3V the XL based starts to have issues below 3.8 volts, don't use it if you are using an input range below 3.8V.

@nithikasandinu9034 Рік тому

Get well soon brother ❤️‍🔥

@greatscottlab Рік тому

My voice is already much better :-) Thanks.

@MrBobWareham Рік тому

Thanks for the video, it was very interesting to see a different approach, perhaps you can help me with a problem, I want to make an 18650 12v power supply to run an emergency LED light, so do I put three 18650 in series to give me my 12 volts or do I put my 18650 batteries in parallel to give me 3.7 volts and boost that voltage to 12 volts, any suggestions for the best method? Thanks, Bob in the UK

@alis990 Рік тому

TL494 is awesome choice. You can even make ~240V DC boost to drive vacuum tubes. Not recommend for beginners, but you can check out Mr Carlson's Lab.

@SLYKER001 Рік тому

look for LTC3780 based boards, it's not SEPIC but it does buck and boost work

@thanatosor Рік тому

Damn... the comment section is moved again. As usual, great content, Scott ! Wish I could do something with this but nah, not even my profession neither my job, still watching this xD

@WagonLoads 5 місяців тому

@greatscottlab Do you know if aliexpress has any variable power modules that can be controlled though i2c.. I want to make a i2c controlled bench power supply. Maybe modify the Dave Jones PWM supply, using a i2c PWM servo controller and ADC feedback to make sure the output matches what you asked for.. and make a triple output supply

@midbc1midbc199 Рік тому

They use the smaller coil packages mainly for size savings and there has been an artificial standard for such converters because a few companies in China did massive runs pumping out near to a half million units and resellers flooding the markets like Amazon and eBay......they become so common that they just get copied

@XdewGaming Рік тому

Where do you find the silver copper wires you use? I haven’t be able to find them for years now.

@Gamezone-sd3er Рік тому

What a great information 😯😊👏 thanks

@greatscottlab Рік тому

Glad it was helpful!

@mannyquinn9031 Рік тому

Beautiful video :) ...at 10:21 is there a missing Gnd potential at the mosfet ??

@akudikechinedu8393 Рік тому

Very good video Mr Scott. please what is the link for the module you recommended?

@fxandbabygirllvvs Рік тому

I would like to know if there's a current limit to them or can I send alot of amperage form one?

@explorerpragun431 Рік тому

Thanks man

@greatscottlab Рік тому

You're welcome!

@qcumbercoolfpv1988 Рік тому

would be awesome to see your thoughts on the sw2303 with power distribution

@After_Tech_Industries Рік тому

I was wondering if I could use a filter choke as a coupled inductor?

@McTroyd Рік тому

I would have thought the two coils in close proximity would couple anyway. Perhaps not as tightly/efficiently as two windings on the same ferrite ring, but... it's something?

@HuangLuxuan Рік тому

recent day I made my own sepic converter with xl6009, two 47uH inductor and a 1uF capacitor. It can deliver much more energy than I think and blow up my AO3400 and AO3401. and another interesting thing is it cannot work with usb because some usb power connection is poor and voltage can drop to 3.5V so the chip will not work properly

@fritzwalter1112 Рік тому

Moin, I have a question regarding buck/boost converters. I have one of these standard 9(or 12, or 24)V DC Plugs. But if I hook them up to a buck boost converter, I can change the output. The output voltage stays constant at 9, 12 or 24 volts. The converters are otherwise okay. I can change the output of these fancy USB c PD boards, but these DC plugs just don't work :(

@planktonfun1 Рік тому

I need that buck boost converter, but I need a very small one for a drone, do you a circuit diagram?

@Drxxx Рік тому

Amazing channel, super video!!

@greatscottlab Рік тому

Thank you very much!

@stephensu4371 Рік тому

nice job

@auntmarina3392 Рік тому

thanks for the knowledge I like all your projects. Next time I'd like you to explain the step down of XL4016 working with 20100ct. It's a small and cheap circuit, but it crashes a lot because I'd like to control the HV power supply.

@greatscottlab Рік тому

I can put it on my to do list

@auntmarina3392 Рік тому

@@greatscottlab Tausend Dank! 😁

@tarrySubstance Рік тому

very interesting video.l really enjoyed the premise of the video.

@greatscottlab Рік тому

Glad you enjoyed it!

@petrok8618 9 місяців тому

Hi! Interesting video! But I have a question. There are big cells of LiFePO4 batteries on a market present nowadays, which can deliver hundreds of amperes while discharging. But most of consumers (ebikes, kickscooters etc) are being powered with standard 12, 24, 36 and 48v voltages in most cases. So it's impossible to power them up from one big cell. Since you are advanced in electronics and DC-DC power converters - maybe you could consider idea of making a boost converter which could convert 3-4v input voltage to one of those high standard voltages with efficiency > 90%. To make as efficient as 90% and avoid switching of high currents on the input, in my opinion you could try to make (for example) 10 multiple core flyback converters, (with isolated secondary coil, around 30w each) and ratio 1:1 and then just connect their secondary windings in series to achieve 36, 12 or some other high voltage :) Or maybe you have some better ideas of how can be done? :) Interesting to hear your ideas about it.

@danevertt3210 Рік тому

I have a bunch of those step up buck converters

@umer6069 Рік тому

Whats the name of the device with the big heatsink and fan with a bright whiter display which you use to test the load

@morrisssss Рік тому

¡Gracias!

@greatscottlab Рік тому

Thank you so much for the support :-)

@hakamsaffour Рік тому

Thanks for the interesting clip Can you provide a link to the buck boost converter recommened by you? (the one with very low resistance?)

@hakamsaffour Рік тому

Any advise?

@ColinTimmins Рік тому

Cool video, thanks as always! =]

@greatscottlab Рік тому

No problem!

@SlavTiger Рік тому

I've got some fiber optic cable laying around, how about a video showing some potential uses?

@charleslambert3368 Рік тому

Not sure if it's a SEPIC but I have a Zk-SJVA-4X buck/boost converter (outputs up to 30V, they say it can take 50W with proper heat dissipation but idk whether to believe them) that uses two wires wound around a single ferrite core.