The Schottky Diode is a Freewheel Diode(Flyback diode). when the Mosfet inside LM2596 switch Off (No Current is flowing) that means the inductor will generate High voltage around itself and that will cause damage to the components especially LM2596 and the diode will prevent that because it will be in the forward bias and that allows the current to flow through it.
The diode has the same function of a diode on a basic Buck Converter diagram. It is called a rectifier or a catch diode, it is used to close the loop circuit on the load side to remove the stored energy from the inductor.
actually no... reverse current is how it works. That LM2596 works as a PWM switch from input to output. When it is open it will charge the capacitor and inductor and when it is charged it will just switch off. Feedback is sensing that. When it is switched off output current flows from the chraged inductor through that diode to the output and when the inductor is depleted voltage on output capacitor will go down and via feedback that LM2596 will turn that internal mosfet on.... that diode is mandatory to work... More complicated dc/dc converters are using second mosfet to that diode and that will open when the main is closed to bypass that diode for lower losses and better effenciency. Also need to be said that it is acutally not turn on and off like i said it is actually fixed frequency (higher is better) - what is changing is PWM duty cycle. This chip is running at 150kHz and you can find for the same money 300kHz version from xlsemi.
@@SureshKumar-nk2ok for charging you need to add current limit feedback, for liion as source you cannot use it because minimal input voltage of that lm2596 is 4,5V
Can I connect the OUTPUT 2 pin to something other than the coil? To something that will control the connection between the battery and the coil. Depending on the signal on pin 2, something will connect and disconnect the battery from the coil. Will I achieve, for example, 10A with the LM2596t which has a max of 3A
I need some help here. I am trying to use this module to make my own RC Nitro car glow igniter. And when I connect the wires to module the glow plug does not ignite and nothing seems to happen. But I measure the voltage at the output in the module and in the glow igniter it reads 1.5 V but when I put a glow plug the output voltage dies. Any suggestions what might be the problem.
Can you please do a follow-up video (or reply here) adding a voltage output limiter (5.1v Zener reference) feedback loop to pin 5 of the 2596 to disable output when the threshold (5.1v) is exceeded. This type of protection would be helpful if only a few components are required.
@B. GLENN, thanks! Very good to know. I saw in datasheet (SNVS124C -NOVEMBER 1999-REVISED APRIL 2013 from Texas Instruments) on page 27... named Undervoltage Lockout with Delayed Startup. I will test this IC with the basic circuit from this video and... after that... I will test come protections!
the inductor is the element that actally steps down the voltage in this circuit. Vout= Vin - Vinductor. And the voltage across the inductor depends on the current variation trough it, and the inductance value
good video well explained. do you know what happens to the output voltage when the input voltage decrease ?????????? vin = 12v output 5v ( regulated in pot.) vin = 10v output= ? stays regulated vin = 9v output = ? " " vin = 8v output = ? etc . for example thanks .
What sould i do for high temprature when using as led driver with 30w cob led it gone high temprature an then burnt-out after 2 minutes. ...please tell me something for this. ...
The max current from the buck converter you will get is 2 amps.. that's why it's happening....🙏... Just simply use a path transistor with the circuit 🙏🙏
thank you for your video; I tried this circuit to provide 7.5 volt to my arduino uno. I go from 28 volt DC to get that 7.5 Volt. I found out that the L2596 becomes hot. Can it handle 28 volt ? Is it normal that it becomes hot ?
@@tomvienna1518 Correct! The guy in the video misinterpreted the coil's smd code, which is 33μH. Not 330!! In this coding system, the third number implies the number of zeros following the main value of the coding, consisting of the two initial arithmetical numbers, that is in this case, 33 followed by 0, meaning none zero exists after 33, with the value always being given in μH...
if you dont know what that SD is for then a video of electronics isnt for you. OUTput is NO AC so there not for filtering. and the top part of your out is Feedback (telling the SMPS the outout power) the SD continues the circuit when the gate is closed or you get a power spike. its also low losses to make the circuit efficient
I guess watching videos, even as good as yours and others, doesn't ensure success or even an adequate understanding ... I'm trying to find a battery power source to power four strobe light units installed on my PARAMOTOR as we fly in often congested airspace. Air Force and civilian aircraft like to fly low over the water just off the beach here in Northern Florida just where we'd like to fly. I purchased supposedly 12v truck led strobe light KIT to attach to my frame. I finally got a multimeter this week and measured the demo battery pack that comes in the strobe package (allows strobes to work on the store shelves) and - the batteries were providing 19.5 vdc. So these are likely the fairly standard 12-24v LED strobe lights sold everywhere. I have a spare 6S LiPo 50C battery pack that provides 22-25.5 vdc so I figured I use this. My plan was to wire up the LM2596 to measure the output voltage and adjust the potentiometer to 19-20 vDC output to test the strobe lights. Input measured 25.1vDC.I put the multimeter leads on the OUT side and made a short piece of twin lead wire connect the IN side and inserted them into the XT60 connector. BOOM A firecracker went off and the capacitor was gone. I turned the Multimeter on after I inserted the twin wire, don't know if that caused the overload - no load when connected? The video said the LM2596 was rated for 30 vDC. A flying buddy offered that perhaps the 6S LiPo's amperage was too much. I measured the 6S LiPo and it jumped around but seemed to be between 373 and 420 mA. It's a new Chinese multimeter and I probably don't know how to use it properly. The small battery pack seemed to measure between 95 -200 mA when connected and would drop to ZERO when the button was pushed. Not sure I understand that behavior. Any comments you'd care to offer to me. I have another spare buck to use but need to figure some other combination to power the strobe lights. "Help me Obiwan ..."
These modules are so cheap, would it make any sense to use 3 of them to step from 30v to 20v, then 20v to 10v, then 10v to 3v? Wouldn't doing this guarantee much less heating of any particular module? Total cost = $2.37 :) Someone tell me if this is a hair brained idea. Also, if 3 is a good idea, what about 6?
This kind of technique was used in the past with the analogue regulators, because they had to transform the excess energy in heat, in order to provide the necessary (desired) output regulation. These buck converters are working under the switching regulation principal, which does not suffer of that heating problem. Therefore this solution is not necessary when using buck converters. Of course a good design is always of utmost importance and its price almost always reflects it's quality...
The value of the inductor is wrong in the drawing. A printing of 330 on the inductor refers to 33uH type. The Schottky diode should be something like an 1N5822/1N5825. For values meeting your VIN/VOUT/IOUT requirements maybe refer to: www.ti.com/lit/ds/symlink/lm2596.pdf including tables for various configurations.
0:32 "Linear voltage regulator rubbish" Not sure but it sounds like he just insulted every linear IC engineer." Linear IC's are not Rubbish. They are a necessary part of electrical component family. I am offended. Who the hell are you ? Many more components in this circuit than in a linear 78XX regulator based circuit which had only three components. I wonder what the output impedance is ? I doubt the DC out , "ripple" is very clean. Guessing about.707 * Zener Voltage. If so then this is very noisy. As current draw increases so should the ripple. This circuit is intended for a using with a pure DC (Battery) Source, not a converted AC source. I do not think this person is qualified to teach nor an Electrical Engineer.
The Schottky Diode is a Freewheel Diode(Flyback diode).
when the Mosfet inside LM2596 switch Off (No Current is flowing) that means the inductor will generate High voltage around itself and that will cause damage to the components especially LM2596 and the diode will prevent that because it will be in the forward bias and that allows the current to flow through it.
The diode has the same function of a diode on a basic Buck Converter diagram. It is called a rectifier or a catch diode, it is used to close the loop circuit on the load side to remove the stored energy from the inductor.
Actually the proper name for the diode is a Schottky Zener Diode. there is no such thing as a "Catch" diode.
The Shottky diode is to make sure no voltage spikes occur as a result of the inability of a current through an inductor to change instantaneously.
purpose of schottky diode is to remove reverse current in case of inductor load.
actually no... reverse current is how it works. That LM2596 works as a PWM switch from input to output. When it is open it will charge the capacitor and inductor and when it is charged it will just switch off. Feedback is sensing that. When it is switched off output current flows from the chraged inductor through that diode to the output and when the inductor is depleted voltage on output capacitor will go down and via feedback that LM2596 will turn that internal mosfet on.... that diode is mandatory to work... More complicated dc/dc converters are using second mosfet to that diode and that will open when the main is closed to bypass that diode for lower losses and better effenciency. Also need to be said that it is acutally not turn on and off like i said it is actually fixed frequency (higher is better) - what is changing is PWM duty cycle. This chip is running at 150kHz and you can find for the same money 300kHz version from xlsemi.
@@matejsojka6683 sir can i use this circuit to vary by li ion batt output
@@SureshKumar-nk2ok for charging you need to add current limit feedback, for liion as source you cannot use it because minimal input voltage of that lm2596 is 4,5V
Can I connect the OUTPUT 2 pin to something other than the coil? To something that will control the connection between the battery and the coil. Depending on the signal on pin 2, something will connect and disconnect the battery from the coil. Will I achieve, for example, 10A with the LM2596t which has a max of 3A
330uH inductor is shown sch. in the video. It should be 33uH ?
yes,it should be 33uH
What the series schottky diode in this video, anyone can explain me?
Good video. The enable or on/off pin will disable high only and a grounded or no connection will enable the chip.
That symbol is for a zener diode. The schottky diode and rectifier diode have different symbols.
No it isnt. It took me one Google search.
Can you draw schematic buck 0.6v ?
Schottky Diode is important for the LM2596 to work with out burning out from the coil switching back the high voltage back to the LM ic
Thanks , Good video , i made circuit same as yours but with LM2576 and it works perfectly
With a 330uH inductor ? :D If I posted a video it would contain proper information and not something that is wrong by a decade .....
I need some help here. I am trying to use this module to make my own RC Nitro car glow igniter. And when I connect the wires to module the glow plug does not ignite and nothing seems to happen. But I measure the voltage at the output in the module and in the glow igniter it reads 1.5 V but when I put a glow plug the output voltage dies.
Any suggestions what might be the problem.
there is overload circuit in IC. your glow plug draw more current than IC supply, the system shut off.
Can you please do a follow-up video (or reply here) adding a voltage output limiter (5.1v Zener reference) feedback loop to pin 5 of the 2596 to disable output when the threshold (5.1v) is exceeded. This type of protection would be helpful if only a few components are required.
@B. GLENN, thanks! Very good to know. I saw in datasheet (SNVS124C -NOVEMBER 1999-REVISED APRIL 2013 from Texas Instruments) on page 27... named Undervoltage Lockout with Delayed Startup.
I will test this IC with the basic circuit from this video and... after that... I will test come protections!
Which schottky diode is?
Hİ
Is there a board design made with the Eagle program?
I need to design a board on the LM2596S eagle.
An urgent homework I have to do ..tenks
You can find plenty of such designs on Aliexpress. From the placement of the parts it is easy to create a design which is not critical at all.
hi I would like to make a regulator, but I cannot identify the black thing written above 330 compared to the proposed diagram
It's an inductor.
Tank Men👍@@CollinBaillie
what is the purpose of the inductor in the circuit??
To smooth out the spikes and block any AC interference
the inductor is the element that actally steps down the voltage in this circuit. Vout= Vin - Vinductor. And the voltage across the inductor depends on the current variation trough it, and the inductance value
L200C ic can you please give this any details
This is a relatively old analogue regulator, which has nothing to do with buck converters like that in this video...
good video well explained. do you know what happens to the output voltage when the input voltage decrease ??????????
vin = 12v output 5v ( regulated in pot.)
vin = 10v output= ? stays regulated
vin = 9v output = ? " "
vin = 8v output = ?
etc . for example
thanks .
When input voltage goes below 5.3V it starts to linearly decrease.
that´s it ... thank you . works more or less like a regulator .
thanks .
Your welcome, consider subscribing to our channel!
What sould i do for high temprature
when using as led driver with 30w cob led it gone high temprature an then burnt-out after 2 minutes. ...please tell me something for this. ...
The max current from the buck converter you will get is 2 amps.. that's why it's happening....🙏... Just simply use a path transistor with the circuit 🙏🙏
@@ElectroSpecies my led takes 36vdc and the current is eprox 800ma it is not reach 2amps.
@@S-Tach
link -- www.amazon.in/dp/B0723FSV7S/ref=cm_sw_r_cp_apa_i_fMCvFbX60T4KS
You can just buy this little beauty for this 🙏
If i increase the voltage, does it also increase the current or ampere?
no. there is a feed back pin which control by IC 2596
thank you for your video; I tried this circuit to provide 7.5 volt to my arduino uno. I go from 28 volt DC to get that 7.5 Volt. I found out that the L2596 becomes hot. Can it handle 28 volt ? Is it normal that it becomes hot ?
Ya plz heat sink
Use a correct inductor and not 330uH as is erroneously shown on this amateur video.
@@tomvienna1518 Correct! The guy in the video misinterpreted the coil's smd code, which is 33μH. Not 330!!
In this coding system, the third number implies the number of zeros following the main value of the coding, consisting of the two initial arithmetical numbers, that is in this case, 33 followed by 0, meaning none zero exists after 33, with the value always being given in μH...
What is the voltage capacity of the capacitor?
50 volts
Can we use it in 40 w solar panel for 14v
What is the value of inductor?
33 uH
if you dont know what that SD is for then a video of electronics isnt for you. OUTput is NO AC so there not for filtering. and the top part of your out is Feedback (telling the SMPS the outout power) the SD continues the circuit when the gate is closed or you get a power spike. its also low losses to make the circuit efficient
I guess watching videos, even as good as yours and others, doesn't ensure success or even an adequate understanding ...
I'm trying to find a battery power source to power four strobe light units installed on my PARAMOTOR as we fly in often congested airspace. Air Force and civilian aircraft like to fly low over the water just off the beach here in Northern Florida just where we'd like to fly.
I purchased supposedly 12v truck led strobe light KIT to attach to my frame. I finally got a multimeter this week and measured the demo battery pack that comes in the strobe package (allows strobes to work on the store shelves) and - the batteries were providing 19.5 vdc.
So these are likely the fairly standard 12-24v LED strobe lights sold everywhere.
I have a spare 6S LiPo 50C battery pack that provides 22-25.5 vdc so I figured I use this. My plan was to wire up the LM2596 to measure the output voltage and adjust the potentiometer to 19-20 vDC output to test the strobe lights. Input measured 25.1vDC.I put the multimeter leads on the OUT side and made a short piece of twin lead wire connect the IN side and inserted them into the XT60 connector.
BOOM
A firecracker went off and the capacitor was gone. I turned the Multimeter on after I inserted the twin wire, don't know if that caused the overload - no load when connected?
The video said the LM2596 was rated for 30 vDC. A flying buddy offered that perhaps the 6S LiPo's amperage was too much.
I measured the 6S LiPo and it jumped around but seemed to be between 373 and 420 mA. It's a new Chinese multimeter and I probably don't know how to use it properly.
The small battery pack seemed to measure between 95 -200 mA when connected and would drop to ZERO when the button was pushed. Not sure I understand that behavior.
Any comments you'd care to offer to me. I have another spare buck to use but need to figure some other combination to power the strobe lights.
"Help me Obiwan ..."
Kindly also explain current
There is no explanation of working..Just explanation of what components are their
Only useful for low power as the efficiency is not good.
Lm3671 ic detail?
These modules are so cheap, would it make any sense to use 3 of them to step from 30v to 20v, then 20v to 10v, then 10v to 3v? Wouldn't doing this guarantee much less heating of any particular module? Total cost = $2.37 :) Someone tell me if this is a hair brained idea. Also, if 3 is a good idea, what about 6?
This kind of technique was used in the past with the analogue regulators, because they had to transform the excess energy in heat, in order to provide the necessary (desired) output regulation. These buck converters are working under the switching regulation principal, which does not suffer of that heating problem. Therefore this solution is not necessary when using buck converters. Of course a good design is always of utmost importance and its price almost always reflects it's quality...
The value of the inductor is wrong in the drawing. A printing of 330 on the inductor refers to 33uH type. The Schottky diode should be something like an 1N5822/1N5825.
For values meeting your VIN/VOUT/IOUT requirements maybe refer to:
www.ti.com/lit/ds/symlink/lm2596.pdf
including tables for various configurations.
So will we get lm2596 module according to the values in that pdf.
@@mastango2278 That will be fine than. You can also use 47uH. Depending on the maximum amperes you require go for a 7x7 or 12x12mm inductor.
i am planning to have very high current output, 20A, what size of inductor should i use?
@@danpham8806 Well with this buck converter you will be limited to 3A
Please tell how can i add a comstant current control to a lm2596 buck converter board
can we design 12v 3A power supply with this regulator?
Thank you .
0:32 "Linear voltage regulator rubbish" Not sure but it sounds like he just insulted every linear IC engineer." Linear IC's are not Rubbish. They are a necessary part of electrical component family. I am offended. Who the hell are you ?
Many more components in this circuit than in a linear 78XX regulator based circuit which had only three components. I wonder what the output impedance is ? I doubt the DC out , "ripple" is very clean. Guessing about.707 * Zener Voltage. If so then this is very noisy. As current draw increases so should the ripple.
This circuit is intended for a using with a pure DC (Battery) Source, not a converted AC source.
I do not think this person is qualified to teach nor an Electrical Engineer.
A heat sink is desirable.
Yes definitely
Do more study on this you will get to know why the diode is used. good work
If it use in negative voltage????
❤
Good
very good explained
Nor it was not a good explanation. It was very basic for the uneducated.
SO and Yaaaaaaaaaaaaaaaaaa !!!!!!!!!!!!!!!
Didn't understand?