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5630 SMD LED Driver/Tube light Circuit

5630 SMD LED Driver/Tube light Circuit

The post explains a simple transformerless SMD 5630 type LED tube light circuit which can be built by anybody for illuminating home interior cheaply. The idea was requested by Mr. Smeet.

Technical Specifications

I am a very big fan of your website and it has been much helpful to me in my college projects i wanted to design a driver to drive 1 to 50 SMD 5630 LE and input voltage 110 to 235 v , forward voltage of LED is 3.3v and i need a very efficient circuit i.e all LED should be maximum brigh would u please help us with this circuitlooking forward to your reply soon 

thank you

The Design

The LED model shown below is the 5630 type surface mount LED from Samsung which has the following typical voltage and current specifications:

Forward voltage: 3.3V
Optimal Current: Between 50 and 150mA
Power dissipation: 0.5 watts approximate.

Although it is recommended to operate any LED via a current controlled SMPS, for simplicity sake the following compact transformerless power supply may be tried and could prove as good as it's other counterparts.

The present design is based on my previous variable transformerless power supply design, which enjoys a novel crowbar network concept for safeguarding the involved sophisticated devices.

The proposed 5630 SMD LED driver or compact tube light circuit may be understood with the help of the following discussion:

Circuit Operation

The input capacitor which is a high voltage metalized polyester 2uF/400V rated capacitor drops the mains 220v to desirable limits and feeds the connected the  bridge rectifier stage.

The bridge rectifier in conjunction with the 1uF/400V rectifies the AC into a 330V DC.

This high DC is applied across the crowbar network comprising the zener, MOSFET and the preset in the stage.

The preset is appropriately set such that the the output matches the total forward drop of the connected LEDs.

If 50 LEDs are connected in series at the output the above preset must be selected to produce precisely a voltage of around 50 x 3.3 = 165V

Once set, this voltage gets clamped and never exceeds even under worse conditions.

The LEDs thus stay safeguarded from all possible high voltage and surge current hazards.

This happens owing to the fact that the mosfet tends to conduct and ground the output voltage whenever the voltage across its drain/source tries to rise above the set value which may be 165V as assumed here.

Other different number of LEDs may be opted for at the output as per individual preferences, and the preset set up as per the calculations discussed above.

In the shown circuit diagram all the LEDs are connected in series to form a chain of 50 LEDs connected one behind the other with anode of one LED connected to the cathode of the other, and so on.

NOTE: Please connect a 50 Ohm / 1 watt resistor in series with the LED chain for better safety of the LEDs

Circuit Diagram


Feedback from one of the dedicated readers of this blog, Mr. Raghavendra Kolkar:

Hello sir good evening, thanks a lot for sending the circuit diagram of led driver. After 5 failures finally the circuit was successful. 

I am sending you the picture of the driver and working. 

Thanks a lot, so far all your circuits are working well and nice.


About the Author

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials. If you have any circuit related query, you may interact through comments, I'll be most happy to help!

76 thoughts on “5630 SMD LED Driver/Tube light Circuit”

  1. I am operating 1w 3LEDs by Nokia Mobile standard battery. When I connected to the LEDs about 1 yard far, the brightness is optimum but about 12 yards far the brightness is not optimum.so I am guessing brightness is decreasing with distance. How can solve that issue???

    • you mean to say when LED wire length from the battery is increased, brightness goes down?? then make sure the battery is close to the LEDs

    • Yes u got my problem but the LEDs need to keep 12 yards distance from battery with circuit for lighting the outer space. Please suggest me alternative way. If I connect capacitor 10v 1000uf in LEDs positive and negative then that situation will improve??

    • There's no solution to this except keeping the battery near to the LEd, because as the wire length increases the resistance offered by the wire also increases causing a proportionate amount of decrease in the current for the LED….

  2. Hello sir,
    I am Tanuj, from KOLKATA. Can you please tell me how many 5730 smd led is connected in parallel or series with transformerless power supply? The power supply made by 1uf/400 volt capacitor with paraller connected 1M resistor.after that adding bridge rectifier and zener diode.

    • Hello Tanuj, it will depend on the output voltage setting of the power supply…..divide the output voltage with 3.3V, that will give you the number of LEDs that could be accommodated.

  3. Hello swagatam,

    I want to drive 90 5630/5730 leds using this circuit.
    (I wanna drive each at these specifics Vf=3.3-3.4; If=130-150mA)

    Considering forward voltage drop of 3.4v per led the total would be 3.4×90=306v.

    Without the dropping capacitor c1, the direct rectified dc voltage for 220-260vac would be between 310-370vdc.

    So safe consideration would be say 350vdc.

    With 350Vdc as Vs and voltage drop of 306v(with If=140mA) for the leds a 300ohm resistor could be used for the led string.

    Now i wanna know if the above circuit will work with these specs and what changes would be required to be made to your circuit ?

    Also where do I shunt a mov for surge protection ?

    Looking forward to your reply, would really appreciate it.

    • Hello Jeremiah, without C1 your LEDs will not last long…so C1 is a must.

      for getting 150mA you may have to use a 4uF/400V capacitor for C1

      for yout application you can ignore the triac circuit it wn't be required….instead use an 10 ohm NTC in series with the input capacitor for arresting the initial surge currents.

    • Hey,thnx fr the reply…
      Btw, Will the circuit give out the needed 306Vdc
      Also does using much higher rated capacitor(1.2kv) change the output ?

    • yes the discussed circuit will be able to provide the required amount of voltage which will equal to the input supply limit….1kV indicates the breakdown limit of the cap, the output can be never above the input supply level

      NTC is better suited than MOV for this application, you can try a 5 ohm NTC

  4. Hi Swagatam,

    Hope you are doing good!

    May I request you to design a high output LED circuit with 12 Bright White LED's. Similar to the DRL's used in the cars. Should be 2 sets of 6 LED's, that can throw some high bright light.

    Thank you,

  5. hi,
    i use a circuit for run30 5630 smd in series .but after two or three month one smd short and when replace it and run again another smd short. ad this is going on.we use 205n400 capacitor .

    • remove the triac and the preset…and simply add two or three 1 watt zener diodes rated at 30 x 3.3 = 99V or 100V..that is 100V/1 watt zeners, 2 nos

      add this parallel to the capacitor 1uF/400V filter cap

  6. Hi sr, firts of all, sorry for my bad english u.u.
    Second, i have 8 lamps with 14 leds 5630, it means that i have to use 46.2 volts, how i can drop the voltage to that? because in your diagram its 165 volts

    • Hi carlos, you may simply remove the triac and the resistors and connect a 50V 1watt zener right across the output capacitor…this will hold the voltage to around 50V….

    • Hi Nikhil,

      there's no specific name for this IC, and it's not rated for high watt operations, only 20mA LEDs can be used with it

      I'll try to update the article soon in my blog. thanks!

  7. earlier there was a thyristor instead of a triac which I later replaced with a triac, the markings are for the SCR which was previously present in that position….

  8. Hi Sir,
    Nice to meet you after a long…my new request is on driving 5630 led at120mA which is rated at 150mA max with 12v 5-8amps dc power supply…..for example 5630 led strip module( 3 led in series with a resistor).

  9. sorry I forgot to mention. the board is live and when you design a board you should make sure that you have enough clearance between any led or copper the earth or mounting holes of your enclosure. at least 3mm.

  10. hi guys. I was busy with research into the smd 5630 led when I stumbled on this post. I looked at the drawing and there is some short falls to it. I also use long strings(81 leds) connected to mains power230v ac rectified to dc . what we found with lots of research is that you can not use any light string with out a current controller. let me explain. when leds start to heat up then the voltage drop over the led decreases, this cause a increase in current which again cause more heat. at the end you will have a dead circuit. we use a basic circuit, sorry I don't know hoe to upload a picture . upload.wikimedia.org/wikipedia/commons/thumb/f/f7/Const_cur_src_111.svg/220px-Const_cur_src_111.svg.png . en.wikipedia.org/wiki/Current_source
    we use MJE340 for the transistor, dz1= 2.7v 1watt,R1=100K 1Watt. R2 needs to be calculated. easy way is r=v/I v is 2v I is the current of your led. for example I need 60ma through my string then R2= 2/0.06 =33ohm. note do not try to use your led at maximum data sheet power because they always produce too much heat rather go for 60% rated current.

    • Thanks! you are right, the fact pretty known though, and I am sure most of the hobbyists already know about this.

      I have covered comprehensively about this cricatility and many more in my other relevant posts, with calculations.

      The above article design was meant for tackling four fundamental things:
      the circuit needed to be cheap, transformerless, surge protected, and easy to assemble.

      The heat factor could be rather solved by using an aluminum base PCB or the LEDs could be itself mounted over an aluminum plate.

      The above circuit attempts to include all these features in one and therefore the current control was ignored.

      However the above the design is already too inefficient as far as amp spec is concerned.

      The triac would dump a lot many amps and I am afraid we would have rather an under illuminated LED string.

      Furthermore the triac network woulds also make sure that the voltage across the array stays close to the rated voltage spec of the LEDs.

      Together, the above circuit is pretty much within the safe boundaries of the devices used and could be considered safe.

    • Hi Mohammed, you can remove the triac and connect a 100 ohm relay coil in series with the LEDs, this will protect the LEDs from sudden voltage surge….or alternatively keep the triac as given and increase the 1uF/400V to 50uF/400V for getting rid of the fluctuations.

  11. Hi sir,
    I 'm going to make your circuit, I have 50 pcs of LED SMD white 0.5 watt and 150ma. can i use your circuit? what is the triac number?

  12. if to take only half of that is 30 leds, what would be the modification of circuit ??? I hope your answer thanks

  13. Dear Sir,

    Can you suggest any transformerless power supply to run 50 or 60 led in series.
    I have some 5mm white leds laying with me. the forward voltage of the led is 3.7v and current arround 30ma

  14. Dear Sir,

    I have built the 2nd circuit with the separate low value capacitor stage for the gate trigger as in the drawing but im not getting any voltage in the 100uf 50v capacitor. DMM shows only 0.5 volts

  15. hi sir for the above circuit. i am going to connect 10 5630 leds in series can i able to get 150mA of current constantley to the leds so that my leds will give maximum light.

    • Hi Unknown,

      No with 10 leds the current would also drop with votage, so according to me you will have to use a least 50 to 60 leds for acquiring or sustaining 100mA current with any capacitive transformerless circuit

    • hi Vaibhav,

      yes you can use them, connect them in series, max current is not known to me because i haven't checked it practically.

  16. Hello Shail,

    Yes you can use the above circuit for types of low current LED driver application.

    According to me nothing would overheat in the above discussed circuits.

    • Helo Avijeet,

      You are correct the zener does not have any relevance here.

      Another issue could be the heating up of the preset and the resistor….the values should be either carefully selected or the gate of the SCR should be attached with the separate capacitive power supply stage. I'll try to update it here soon.

    • Is above mentioned issue also persists if we use the above circuit in low voltage output as it is in schematics(say 12v or 24v)for less no of led's

    • for lower voltage requirements, it would be better to include the zener as it would keep the output within the zener voltage under all conditions.

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