A golden oldie, which I'm watching again. Eight years ago, which seems like a long time, but feels like it was only the other week. Eight years ago, my 'journey' began - where a hobby became something else and has led me to retrade into a the holiest of holy trades and I couldn't be happier. Dave - thank you mate for guiding the way and making the seemingly impossible become reality! Thanks for 'passing it forward'...I owe you one! :)
Hey Dave. I just wanted to say that you are freaking AWESOME! I'm somewhat of a beginner hobbyist. I just cracked open a car charger someone gave me, searched the chip (mc34063), and BAM -- Dave's got a ~40-minute, step-by-step video all about how to design for this chip!!!! So cool you are. You've taught me so much. If you were here, I'd shake your hand. Thank you 1000 times. I love your attitude. You are a pretty cool guy. My love to you and yours. Have a wonderful life!
Thanks Dave, I have to admit for me this is one of the best vids yet. Scrounging for the chip inside a car adapter. I took apart that from Sirius Sat Radio no go there. Then, I opened up one from a Nintendo DS Score! What I got out of this the most was that repurposing old or unused electronic items you get quite the spare parts bin. Also, using the data sheet to start your diagraming and mathing out the circuit thanks. Also, I made note of the 4 DMMs I added that tidbit to my own Electronics note book. I have three and a O Scope 50MHZ. There are so many uses for this. Thanks again. This could
Very helpful Dave. This and your other video about how a Switch Mode Power Supply Is basically a Linear regulator (they both use a noninverting amplifier just as on your shirt) is just awesome!
Just a quick note, when you are doing the calculations, you are calculating Lmin and Cmin, that means you have to use at LEAST these values using IDEAL components. You almost never go, or round, to a lesser values. Real components have ESR and a lot of stuff, which means, even in theory, you are going to need components with more values than calculated, not mentioning the tolerance, so for the example in the video, use a 47uH inductor, and 100uF capacitor, and you'll have results that comply with your specs. Great video, though.
Hey Dave, thanks much for the hard work you've put into this. Magic! I had some fun recently with a 34063 Oatley Electronics K207A LED kit using 6 LEDs. Works fine now, but took a bit of research which included speaking with Branko :-) BTW, I tried an 'online' 34063 calculator and came up with the following: Strange value for Ct for a start... Ct=3028 pF Ipk=823 mA Rsc=0.365 Ohm Lmin=32 uH Co=68 uF R=180 Ohm R1=1k R2=11k (15V)
G'day Ken, an absolutely bonza vid. This has helped me immensely, as I've been clinging to old school tech by using a mains tranny setup with a V-reg configuration. Since doing my trade over 30 years ago, I've been very reluctant to switch over to SMPS design. You've changed that for me, thank you... One thing I should mention though: It would have been great to show us the total max input current that was needed for your design. Though I did cheat by pausing the vid at 32:46 to see that you plotted it at ~ 532mA. I felt this was important, due to knowing what external supply current was needed, say from a Plug-pack as an example... Once again mate, thank you so much for these videos... Take care :)
Great video dave! I've actually used the MC34063A forever in just about all of my designs. It's a great cheap, and it's cheap. If you want higher frequency though obviously it has a limitation of only 100kHz as you mention. I made a nice spreadsheet for calculating all of the values if anyone is interested.
One thing beginners need to watch for when using the MC34063 datasheet for a simple BOOST converter is the 40V maximum voltage allowed using the internal switch. Even though the formulas will give the user the component values for a 12V to 60V converter, for example, the result would exceed the maximum rating (Switch Collector Voltage VC(switch) 40 Vdc). Additional margin is required to allow for the drop across the Schottky diode as well as overshoot. (Consequently, a practical limit for the output of the simple boost using the 34063 is typically 35V.) If you want higher voltages you need to go to designs that augment the MC34063 with external transistors. Bottom line is that the formulas themselves don't include the checks that the input values and results are compatible with the device ratings. So after running through the steps in formulas the designer must always check that the input values and results are compatible with the maximum ratings.
Good video, as always. To make your lives easier: The best MC34063 calculator I could find (after 10 secs of googling and 3 mins of trying some of them out) is the one by rau-deaver. It's only for the step-up config, though, but there are more (typically less detailed) online calculators. The one on nomad.ee has the advantage of optimizing both R1 and R2 automatically. Another one is dedicated to Dave Jones. :)
I have boxes of these! About 20 years ago I got samples from ON Semi, they sent me 25 DIP8 and 25 SO8. This video is 10 years old and there are much better devices today (2021) using much higher freq. and much smaller inductors. 100khz is just too low today and now you get cheap chips with current limiting. If you go to LT's site you can even download their simulator. I just checked Proteus and you can simulate the 34063A in their simulator. Thanks Dave, it's still a fun chip.
Great video Dave. I just wanted to clarify something that caused me a bit of confusion. To calculate the timing capacitor, you have to convert the 10 micro seconds to pico seconds to arrive at the proper decimal place for pico farad.
hey great video, i really appreaciate you taking the time to make this. I have a question. how did you get the values for your efficiency using your input and output values?
One of the reasons why the ripple was higher than what you calculated might be that the formula used doesn't take into account the ESR. At 100 kHz the impedance of a 100 uF ceramic capacitor is dominated by the ESR.
Good informative video. Thanks for sharing, I have some clarifications though: The real power (in Watts) will be not be equal to the product of the measured voltage and current since the values of current and voltages are not a a constant DC. The real power (in Watts) equal to the product of V and I is applicable only to a constant DC voltage and current. The calculation of real power will be very complicated as you need to break down the signal into an equivalent Fourier series and calculate each component and adding the result; taking into account the power factor of each component sine waves. This will be unpractical though. A Wattmeter with true rms capability would be better.
This video is a very good resource to supplement the content written in the book "The Art of Electronics" by Paul Horowitz and Winfield Hill on MC34063. This video makes it much easier to understand what is explained in the book.
Great video, very usefull, this IC rocks because its 1.5 A output is enough for driving some more powerfull mosfets, and is very cheap and easy to use.
Thanks for the great tutorial! I've used some cheap boost regs based on a China made B6287d chip, and I've used them to get more life from 9V batteries when powering guitar effects pedals. The idea works well enough, but even 20 mV PP noise is too much for those high gain audio circuits. The good news is I've had much better luck with RC filters than LC for light loads. A 47 ohm resistor and a 50uF cap can make that ugly spiky ripple become immeasurable, and more important, inaudible. But I'm tempted now to try moving the feedback to a point beyond the filter. This would make the response time to load changes much slower, but for fairly constant loads, are there any other downsides? I'm thinking yes, because I never seem to see any boost circuits with the feedback taken from after an external filter, so there must be an awful reason not to do it?
Dave I would have been interested to see you put up the efficiency curve for the Nokia charger that you showed to see how a commercial product compares.
TI examples show 87% and 83% efficiency. If you want greater efficiceny do you first tweak component values? If you still want greater efficiency do you let it have a greater ripple and then add a second order filter?
or if you can't get any fancy controllers and don't want to use the tl494/uc3842, you can make your own. i built my own smps controller using a 555 and a comparator. it drives a 2-transistor forward converter putting out 400w. works in pulse skipping mode like some of the power integration chips. great efficiency, but you do have to varnish the transformer so it doesn't whine. but it's got lightning fast response, and no compensation required because there's no error amp in the first place!
How much current should the Inductor be able to handle? would it have to handle the entire load of the output? or is it very small because it's just acting as the oscillator? Thanks for all the great videos.
Hi, i build a step up converter 10v to 20v 150ma about 3w output. under no load, the voltage output is fine at about 20.5v. however when i attached a 4w 135 ohms load, it shorted the circuit. may i know what i might have done wrong?
Great tutorial thanks a lot! Could I follow this tutorial for building a converter that delivers 100V output? What would I need to watch out for? Thanks Dave and anyone who has experience with DC DC converters.
Would those formulas still work for a voltage output of around 300-400 volts? (Assuming I'm using the proper HV transistors) or they were designed just to work in the low voltage range?
Excellent Vdo. After watching all your videos, things look so easy and transparent. Great work. Can you please help me designing smps from 220V AC to 12V DC output at 2 or 3 amp ? can you suggest where to look for specifically ? Constant Voltage.
Hi I built a step down converter following the data sheet, and I am not getting any power. Can you recommend any places to go for help in troubleshooting the circuits?
I want to use the inverting configuration to convert 9Vin to -12Vout. When I got to calculating the Ton, I got an answer of -10uS. At that point I stopped to ask this question: Do I need to plug in a positive Voltage for the output and the chip will invert it.
Got any suggestions for more advanced applications, as for me I'd like to design an off-line buck converter to output 12v. The hardest problem for me is figuring how to power the logic circuitry without a secondary power supply(kinda defeats the purpose of the buck)
Great Video Dave!.. I have been recently trying to work out what would be the best path to creating a DC to DC step up converter which would involve high current. My project is trying to elevate the issue around li ion cell balancing i.e. instead of wiring together li ion cells in series to get the required voltage wire all cells in parallel. This would elevate the issue of having to balance the individual cells.... But this creates the issue of having the step up the voltage to the required level and being able to handle the current involved. e.g. a battery consisting of 50 x 3.6v 2.0ah li ion cells wired in parallel would create a 3.0 to 4.1v 100Ah battery(depending on charge state). I would want a to convert this input to a constant output of 36v with 5-7 Amps current max to run my electric motor on my bike. Do you know of any DC to DC converter products which would be available off the shelf? I have not been able to find any.. Would I be wasting my time because the efficiency would be too low? Your current video will hopefully put me on the right path which would use the formulas to calculate the correct requirements but I have a lot more understanding to gain.. Anyway thanks again for this great video.. I will be watching more when I have the time!!
Chips with MOSFET switches instead of the bipolar junction transistors found in the example MC34063 IC's are going to be preferred whenever better efficiency and higher currents are needed.
I wanted to ask on one of the applications in"Theory and applications of the MC34063" which is a Step up/Down switching regulator operation for the situation when you want to regulate a voltage close to you battery voltage. I want a 3.7 out of a nominal 3.7V battery but as you know batteries have a discharge curve in which sometimes they are over or under the 3.7V and I wanted to use this config on my circuit do u know anything about its efficiency or if its even worth using? thanx and great job
Can I use 2 x boost or buck converters (same spec), connect them to the same source and set to same output voltage in parallel to increase the current? Will it work?
someone help me please. I want to buy voltage regulator and the two i came across uses MP1484 and lm2596. Can anyone tell me which one should i buy. I want to step down voltage to 5 volts for solar usb charger.
Given the 1.25V ref, you can set the output voltage by feeding a certain fraction of the desired output to the comparator, hence the divider R1, R2. Too small resistors draws too much current from your output (hence loss of efficiency, loss of output current rating to the real load). Big values cause slower response of the comparator (possibly instability) due to large time constant with parasitic capacitances, reduced noise immunity. General rule, values in the 10k to 1M range are good.
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A golden oldie, which I'm watching again. Eight years ago, which seems like a long time, but feels like it was only the other week. Eight years ago, my 'journey' began - where a hobby became something else and has led me to retrade into a the holiest of holy trades and I couldn't be happier.
Dave - thank you mate for guiding the way and making the seemingly impossible become reality! Thanks for 'passing it forward'...I owe you one! :)
Hey Dave. I just wanted to say that you are freaking AWESOME! I'm somewhat of a beginner hobbyist. I just cracked open a car charger someone gave me, searched the chip (mc34063), and BAM -- Dave's got a ~40-minute, step-by-step video all about how to design for this chip!!!! So cool you are. You've taught me so much. If you were here, I'd shake your hand. Thank you 1000 times. I love your attitude. You are a pretty cool guy. My love to you and yours. Have a wonderful life!
I'm really enjoying your videos. I feel like I'm watching the Steve Erwin of electrical engineering. Super entertaining!
11:40 FORMULAS ON THE DATASHEET? Man I do love me when the components are THIS detailed.
Don't you wish everything came with a datasheet?
Thoughtyness Wish my girlfriend had one
MC34063 is like the NE555 for DC-DC converter controllers :-)
MrOpenGL is the 555 a mosfet?
The 34063 is more popular than the 555. There are timer peripherals in every microcontroller and the 555 is not as popular as before.
@@joshuanorris5860 555 is a timer or something like that
I've been looking EVERYWHERE for this video! I'm glad you made one! It's awesome
Great video Dave. Opens up possibilities.
Once again, thanks for sharing knowledge and giving us hope! You're definitively awesome!
Wow, Dave! Thank you so much! :) Your videos have greatly helped me undertand the SMPS! Also, The Amp Hour rocks!
Cheers from republic of Georgia!
Very helpful, Dave. Thanks a lot.
Thanks Dave, I have to admit for me this is one of the best vids yet. Scrounging for the chip inside a car adapter. I took apart that from Sirius Sat Radio no go there. Then, I opened up one from a Nintendo DS Score! What I got out of this the most was that repurposing old or unused electronic items you get quite the spare parts bin. Also, using the data sheet to start your diagraming and mathing out the circuit thanks. Also, I made note of the 4 DMMs I added that tidbit to my own Electronics note book. I have three and a O Scope 50MHZ. There are so many uses for this. Thanks again. This could
Thanks for your many fascinating videos! We have all learned a lot of good stuff from your lessons! A Big Fan - RL Atlanta, Georgia, USA
Very helpful Dave. This and your other video about how a Switch Mode Power Supply Is basically a Linear regulator (they both use a noninverting amplifier just as on your shirt) is just awesome!
Excelent job on explaining the formulas!
Great Video and a Nice caption on the T-shirt. 👍
Just a quick note, when you are doing the calculations, you are calculating Lmin and Cmin, that means you have to use at LEAST these values using IDEAL components. You almost never go, or round, to a lesser values. Real components have ESR and a lot of stuff, which means, even in theory, you are going to need components with more values than calculated, not mentioning the tolerance, so for the example in the video, use a 47uH inductor, and 100uF capacitor, and you'll have results that comply with your specs.
Great video, though.
Wow I did not remember how wonderful these videos were
Thanks David, as always a very good tutorial.
Thanks Dave! I will keep my eyes open for this chip and experiment with it.
very timely for me looking to replace a linear P/S for one of my project with a Switched mode, awesome thanks Dave!!
Damn, seems like a good chip for building and learning circuits. Thanks a lot!
Thanks Dave! Great video.
I am a very long l
Very nice job, Dave!
Hey Dave, thanks much for the hard work you've put into this. Magic!
I had some fun recently with a 34063 Oatley Electronics K207A LED kit
using 6 LEDs. Works fine now, but took a bit of research which included speaking with Branko :-)
BTW, I tried an 'online' 34063 calculator and came up with the following:
Strange value for Ct for a start...
Ct=3028 pF
Ipk=823 mA
Rsc=0.365 Ohm
Lmin=32 uH
Co=68 uF
R=180 Ohm
R1=1k R2=11k (15V)
Great to see that Avasva has new instructions to save my money and energy to build it.
G'day Ken, an absolutely bonza vid. This has helped me immensely, as I've been clinging to old school tech by using a mains tranny setup with a V-reg configuration. Since doing my trade over 30 years ago, I've been very reluctant to switch over to SMPS design. You've changed that for me, thank you... One thing I should mention though: It would have been great to show us the total max input current that was needed for your design. Though I did cheat by pausing the vid at 32:46 to see that you plotted it at ~ 532mA. I felt this was important, due to knowing what external supply current was needed, say from a Plug-pack as an example... Once again mate, thank you so much for these videos... Take care :)
Great video dave! I've actually used the MC34063A forever in just about all of my designs. It's a great cheap, and it's cheap. If you want higher frequency though obviously it has a limitation of only 100kHz as you mention. I made a nice spreadsheet for calculating all of the values if anyone is interested.
Hello. Nice video.
Thanks for this explanations.
One thing beginners need to watch for when using the MC34063 datasheet for a simple BOOST converter is the 40V maximum voltage allowed using the internal switch. Even though the formulas will give the user the component values for a 12V to 60V converter, for example, the result would exceed the maximum rating (Switch Collector Voltage VC(switch) 40 Vdc). Additional margin is required to allow for the drop across the Schottky diode as well as overshoot. (Consequently, a practical limit for the output of the simple boost using the 34063 is typically 35V.) If you want higher voltages you need to go to designs that augment the MC34063 with external transistors. Bottom line is that the formulas themselves don't include the checks that the input values and results are compatible with the device ratings. So after running through the steps in formulas the designer must always check that the input values and results are compatible with the maximum ratings.
Excellent VIdeo. Thank you very much.
Good video, as always.
To make your lives easier: The best MC34063 calculator I could find (after 10 secs of googling and 3 mins of trying some of them out) is the one by rau-deaver. It's only for the step-up config, though, but there are more (typically less detailed) online calculators. The one on nomad.ee has the advantage of optimizing both R1 and R2 automatically. Another one is dedicated to Dave Jones. :)
Thanks fo all the Knowledge !! ⭐⭐⭐⭐⭐
I have boxes of these! About 20 years ago I got samples from ON Semi, they sent me 25 DIP8 and 25 SO8. This video is 10 years old and there are much better devices today (2021) using much higher freq. and much smaller inductors. 100khz is just too low today and now you get cheap chips with current limiting. If you go to LT's site you can even download their simulator.
I just checked Proteus and you can simulate the 34063A in their simulator.
Thanks Dave, it's still a fun chip.
We need a "We won't go in to that" t-shirt!!!!!!!
Also pretty useful if you don't know shit but still wanna sound like a smartass.
@@SE45CX I've met quite a few people like that. They're a minority, but a very annoying one.
Very good explanation, even for someone like me that's very new to electronics tinkering.
Great video Dave. I just wanted to clarify something that caused me a bit of confusion. To calculate the timing capacitor, you have to convert the 10 micro seconds to pico seconds to arrive at the proper decimal place for pico farad.
big fan, nice vids, great tutorials, all just great
hey great video, i really appreaciate you taking the time to make this. I have a question. how did you get the values for your efficiency using your input and output values?
One of the reasons why the ripple was higher than what you calculated might be that the formula used doesn't take into account the ESR. At 100 kHz the impedance of a 100 uF ceramic capacitor is dominated by the ESR.
Good informative video. Thanks for sharing, I have some clarifications though:
The real power (in Watts) will be not be equal to the product of the measured voltage and current since the values of current and voltages are not a a constant DC. The real power (in Watts) equal to the product of V and I is applicable only to a constant DC voltage and current. The calculation of real power will be very complicated as you need to break down the signal into an equivalent Fourier series and calculate each component and adding the result; taking into account the power factor of each component sine waves. This will be unpractical though. A Wattmeter with true rms capability would be better.
Hi. Noticed a subtle error in your calculation for R2. Note it should be:
R2 = R1 * ( Vout/1.25 - 1)
Note the parentheses
This video is a very good resource to supplement the content written in the book "The Art of Electronics" by Paul Horowitz and Winfield Hill on MC34063. This video makes it much easier to understand what is explained in the book.
Great video, very usefull, this IC rocks because its 1.5 A output is enough for driving some more powerfull mosfets, and is very cheap and easy to use.
Awesome shirt Dave!
Very cool-- I love how you actually go through everything and explain each step-- very entertaining-- what is your take on the AX3022 chip?
Thanks, Dave!
thanks for the great video!
great work!
T-shirt is great. Love it.
Soz..... That was really easy, thanks save, like you vids, thanks a bunch!!
u made it simplest ever..........thanks a lot
This stuff is pure gold.
Hello, great video. I am certainly a newbe, do all components need to match the peak current rating or just the diode? (i.e. the inductors) thank you!
Hi thanks for a great video! Current sense / shunt resistors, where do you get those?
Thanks for the great tutorial! I've used some cheap boost regs based on a China made B6287d chip, and I've used them to get more life from 9V batteries when powering guitar effects pedals. The idea works well enough, but even 20 mV PP noise is too much for those high gain audio circuits. The good news is I've had much better luck with RC filters than LC for light loads. A 47 ohm resistor and a 50uF cap can make that ugly spiky ripple become immeasurable, and more important, inaudible. But I'm tempted now to try moving the feedback to a point beyond the filter. This would make the response time to load changes much slower, but for fairly constant loads, are there any other downsides? I'm thinking yes, because I never seem to see any boost circuits with the feedback taken from after an external filter, so there must be an awful reason not to do it?
Dave I would have been interested to see you put up the efficiency curve for the Nokia charger that you showed to see how a commercial product compares.
The optional LC filter is where you'd place a current pass transistor if you needed more even lower noise, right?
Ahhh makíng me proud as ON took over old TESLA in here in Czech rep. and MC34063 was made about 20km from my home...
TI examples show 87% and 83% efficiency. If you want greater efficiceny do you first tweak component values?
If you still want greater efficiency do you let it have a greater ripple and then add a second order filter?
or if you can't get any fancy controllers and don't want to use the tl494/uc3842, you can make your own. i built my own smps controller using a 555 and a comparator. it drives a 2-transistor forward converter putting out 400w. works in pulse skipping mode like some of the power integration chips. great efficiency, but you do have to varnish the transformer so it doesn't whine.
but it's got lightning fast response, and no compensation required because there's no error amp in the first place!
Wouldn't it be nice if datasheets had an embedded Excel spreadsheet?
+pratherat Thats an excellent idea.
HE! EXCELlent...I'll go to the corner.
pratherat Some ICs do have one. Whenever you got an IC, following that just search excel with that IC partnumber and you might be lucky.
that shirt rocks :) I would love to get my hands on some..
Excelent video!
Thank you so much you are the best :D
How much current should the Inductor be able to handle? would it have to handle the entire load of the output? or is it very small because it's just acting as the oscillator?
Thanks for all the great videos.
Hi, i build a step up converter 10v to 20v 150ma about 3w output. under no load, the voltage output is fine at about 20.5v. however when i attached a 4w 135 ohms load, it shorted the circuit. may i know what i might have done wrong?
Great tutorial thanks a lot! Could I follow this tutorial for building a converter that delivers 100V output? What would I need to watch out for? Thanks Dave and anyone who has experience with DC DC converters.
24:00 You forgot a parenthesis. Great job anyway :D
+Kostadin IV Kostadinov Glad I'm not the only one that saw that. You've verified that I'm not insane. :)
Would those formulas still work for a voltage output of around 300-400 volts? (Assuming I'm using the proper HV transistors) or they were designed just to work in the low voltage range?
Hi, do you have video about SEPIC anywhere? Thanks!
Excellent Vdo. After watching all your videos, things look so easy and transparent. Great work.
Can you please help me designing smps from 220V AC to 12V DC output at 2 or 3 amp ? can you suggest where to look for specifically ? Constant Voltage.
@leeYT321987 Glad you found it helpful, thanks.
I actually like data sheets with lots of formulas. It makes your application more specific.
As you suggested fitlr output? and formula?
Thank you
Could someone explain why the Darlington configuration voltage drop should only be accounted for in the stop down converter
just look at how the Q1 Q2 internal transistors must be configured
@HillOrStream Annotation and link added to the video. It's #90
Do you have any info on that dummy load? was it bought or made? thank you love this channel
Greta video, thanks!
Hi I built a step down converter following the data sheet, and I am not getting any power. Can you recommend any places to go for help in troubleshooting the circuits?
What's the device that you used to adjust the load (the one that has the current output display)? I'd like to get one!
I want to use the inverting configuration to convert 9Vin to -12Vout. When I got to calculating the Ton, I got an answer of -10uS. At that point I stopped to ask this question: Do I need to plug in a positive Voltage for the output and the chip will invert it.
ordered some MC34063A and SR540 :]
Got any suggestions for more advanced applications, as for me I'd like to design an off-line buck converter to output 12v. The hardest problem for me is figuring how to power the logic circuitry without a secondary power supply(kinda defeats the purpose of the buck)
If the input voltage changes, will it affect the output? (When using the mc34063 to step down the voltage)
Love it!
Do you know any source that explains the Step-down converter with an external transistor schematic for 2A output supply?? or any available video ??
Would this work with negative voltages or should i be looking for an alternative version of this IC? I am looking to achieve -9volt to -12volts.
Do you have tutorial how to make a sm step-down voltage using this ci with a external transistor
?
Can i put a mosfet after emitter of output transistor and change inductor for more current?
Thank you for this
Great Video Dave!.. I have been recently trying to work out what would be the best path to creating a DC to DC step up converter which would involve high current. My project is trying to elevate the issue around li ion cell balancing i.e. instead of wiring together li ion cells in series to get the required voltage wire all cells in parallel. This would elevate the issue of having to balance the individual cells.... But this creates the issue of having the step up the voltage to the required level and being able to handle the current involved. e.g. a battery consisting of 50 x 3.6v 2.0ah li ion cells wired in parallel would create a 3.0 to 4.1v 100Ah battery(depending on charge state). I would want a to convert this input to a constant output of 36v with 5-7 Amps current max to run my electric motor on my bike. Do you know of any DC to DC converter products which would be available off the shelf? I have not been able to find any.. Would I be wasting my time because the efficiency would be too low? Your current video will hopefully put me on the right path which would use the formulas to calculate the correct requirements but I have a lot more understanding to gain..
Anyway thanks again for this great video.. I will be watching more when I have the time!!
So what we need is a multimeter that can multiplex 4 input sets and read out on a tablet via bluetooth?
Chips with MOSFET switches instead of the bipolar junction transistors found in the example MC34063 IC's are going to be preferred whenever better efficiency and higher currents are needed.
Is it possible to use the MC34063 to generate a +5V/-5V dual rail supply from a single 9V battery?
I wanted to ask on one of the applications in"Theory and applications of the MC34063" which is a Step up/Down switching regulator operation for the situation when you want to regulate a voltage close to you battery voltage. I want a 3.7 out of a nominal 3.7V battery but as you know batteries have a discharge curve in which sometimes they are over or under the 3.7V and I wanted to use this config on my circuit do u know anything about its efficiency or if its even worth using? thanx and great job
Can I use 2 x boost or buck converters (same spec), connect them to the same source and set to same output voltage in parallel to increase the current? Will it work?
someone help me please. I want to buy voltage regulator and the two i came across uses MP1484 and lm2596. Can anyone tell me which one should i buy. I want to step down voltage to 5 volts for solar usb charger.
Given the 1.25V ref, you can set the output voltage by feeding a certain fraction of the desired output to the comparator, hence the divider R1, R2. Too small resistors draws too much current from your output (hence loss of efficiency, loss of output current rating to the real load). Big values cause slower response of the comparator (possibly instability) due to large time constant with parasitic capacitances, reduced noise immunity. General rule, values in the 10k to 1M range are good.
I use LM2576hv - because it is 60v input and 3a output chip. It is more expencive, but allow do the same invertors boards for 12v-48V
+Miru Mir or you could just add a mosfet
bac302: Was just thinking the same thing. Need about 2 amps so I was about to ask just that.
Thx
Why wouldent i want a larger inductor? It wouldent be more efficient?
I thought there was no replacement for displacement :P