Overview . I THINK 3,5 IS MUCH CURRENT BECAUSE P=V.I=34V . So far we have learned about LEDs with rather smaller features and applications. yes 102 LEDs will be required and will need to be connected as shown in the diagram. DO NOT DECREASE THE RESISTOR VALUE TOO MUCH OR INCREASE THE APPLIED VOLTAGE IN ORDER TO GET HIGHER BRIGHTNESS. A simple two transistor, powerful current limiter, LED driver circuit, which can be used for converting the above discussed device into a 100 watt LED flashlight or to be more accurate, a floodlight is described below: The circuit of a 100 watt LED flood light shown below has been discussed in few of my other articles also, due its versatile and rather straightforward design; the circuit becomes very suitable in places where current limiting at low costs becomes an issue. 1. 2. i have 6watt led from ebay and data is 9v-12v dc. Shigida, you can use the the first design from the following article: https://www.homemade-circuits.com/how-to-make-current-controlled-12-volt/.

You are requested to provide schematic/ solution based on either TOP249 or TOP250 or TOP256EN . yes, it seems there was a mistake while calculating, that's the reason why I suggest everybody to calculate the parameters themselves using the formulas which are explained comprehensively, because I have to attend many many comments together and that can make me prone to mistakes.. your calculations are correct if you did it exactly as explained in the article…. In this stage, i guess 32V is feasible right. 3. I had 50W LED but getting much illumination than required so i want to know how to reduce the 50W illumination Please suggest me. And I need LED of a colour temperature nearly 2800K to match my Halogen is it possible? IF I WOULD LIKE THE OPTION 1 CIRCUIT HOW FINDING VALUES? Apply the above output to a LM338 current limiter circuit and use the output from this circuit to illuminate your LED. A constant current source ? While the ratings of a 3 watt LED are Forward Voltage: VF 3.4V , Forward Current: 700mA . The outputs are appropriately rectified and filtered by the connected fast recovery diodes and high voltage filter capacitors. I have a 10W LED which has a forward voltage of 9-11V with a max current consumption of 1050mA. Or you mean in this case ,there is no need of this circuit at all.I am confused.help me pls. Just trying to protect his leds if the circuit doesn't regulate for some reason.

Hi Yadav, What is the specification of heat sink? @ 380mA. You are hereby requested kindly to provide non-PF solution based on TOP-GX Switches. Can you please suggest a best transformer-less circuit with best filter with zener protection. regarding the SMPS you may have inquire in the local electronic market, or you can buy it from any relevant online store. I would like to try a 50 watt version and a 30 watt version, would you change the R value for each curcuit? Okay, thanks!

You might consider adding a heatsink on the design.

I would also prefer these circuits to include reverse polarity protection, battery over-discharge protection and, if possible, thermal protection. Hi, you can run all the 5 modules from a single adequately rated power supply unit, preferably an SMPS unit.

The post presents an SMPS based LED street lamp driver circuit which can be used for driving any LED lamp design right from 10 watts to 50 watts plus. I used T1,T2 mje3055, R1 390R and R2 0.5R (3w both). The IC instantly triggers itself and the mosfet, implementing the featured ZVS operations and switching the mosfet at the specified compensated rate, depending upon the mains input level. connect T1 base through the reed to R1, meaning the T1 base should connect to R1 through the reed…that's all. However the above mentioned design is suitable for higher voltage drivers where an IC regulation may not be available, for your 10watt 12V purpose you can simply use a LM338 current controller as explained here, although for a 42V driver the above circuit may be tried since an IC circuit could be difficult to find. Hi Swagatam, excellent tutorials you have made here. Thanks for the setup, could you pls tell the value of T1 and T2. Hello, this site is awesome, thank you for it. yes heatsinks are always made with aluminum, make sure that the aluminum plate is much bigger than the area of the LED measured…you can bend the extra length of the aluminum backwards at 90 degrees to make the design compact. And also is 0.2 or 0.7 ohms resistor available in market?Can I use TIP41 instead of TIP31? dear marinko, if you restrict the current to a safe level by the procedures explained in the above article then the voltage will automatically settle down to the LED spec…36V will not be an issue once the current is suitably limited. Dear Mr. Jono 0r Else, Most of the circuits go off after about 15 min operation and auto-restart after few minutes. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials. M S yadav. Please watch the overview for LinkSwitch-PL and PH if it is okay to use single stage LED driver in your application. Is it heating up the LED driver? and what is the specification of heat sink? We use cookies to ensure that we give you the best experience on our website. I have a confusion. Please help if you can Thank you, Thanks! Hello, if i need to control a on/off 10W 12v led with a 12v 3.3 battery with a reed switch, where do i need tu put it on the circuit?thanks, you can wire the reed across the positive supply and the base of T2…make sure to include a 1K resistor in series with one of the reed wires…. You must log in or register to reply here. I can build stuff from schematics, and cross reference if I don't have the recommended transistors, but I need to know where to start looking in my scrap box…. I would like all 4 of these circuits to maintain the brightness of the LEDs with fully charged batteries all the way through until they need to be charged. 1K with the reed will not be required now. so I would recommend you to use the above circuit with current limit set to 800mA. Consider sandwiching the secondary. I have a 20w led (36v and 0.525mA) what are the resistors that i need?be already in useT1:TIP31C, T2:MMBT3904. Please use the formula furnished for calculating the resistors. I think you should go for 32V as it looks very optimal, safe and within the reach of an LM338 circuit which I would be referring to you, the above circuit could be relatively crude so I don't recommend it. Regards, Building PWM is for experienced hobbyist. At least 20 watts. Hi Yadav, You can do it by simply by connecting the above explained transistorized current limiter circuit stage with the output of any standard 12 V 2 amp SMPS AC to DC adapter unit, and then connect the LED at the position shown in the diagram…, the value of R2 will be 0.6/2 = 0.3 ohms..2 watt. test the module with the supply, if all the LEDs light up successfully you can assume that the LED were correctly fixed with no polarity errors, if not then check those specific series connections for the fault. yes you can use any standard 555 astable flasher circuit and drive the LED from a BJT stage connected at pin3 of the IC…..such as a TIP122…connect its base with pin3 via a 10k resistor, emitter to ground (negative) and the LED across collector of the transistor and positive supply. Hi Latif, 12V 1 amp cannot be used for driving a 50 watt LED optimally, because 12 x 1 = 12 watts, whereas your LED requires 50 watts.so please identify the V and I specs of your LED and supply the specified amount power to it, without forgetting a current controller stage in the middle. 4. 9707a392-a733-11e5-ac1d-d7e256602c6e says. That loses over 1W in the on state. L1 could then be replaced with the specified LED. I suposse that my T1 must be the 2sc3320 and my T2 the 2n2222? Very good website and very useful !!!! A current sensing resistor connected at the emitter of T1 is used to convert the current consumed, into a potential difference, across it. And how much led I can use for 100watt led? Get More Information@ http://bit.ly/2xSY1XQ, Hi...i am a new user here. use the first design, replace LM117 with LM338 and calculate R1 from the given formula, ….a 0-24V after rectification would output around 34V, which is just suitable for your application, the rest will be handled by the LM338 circuit.

Can capacitor based power supply handle 3 amp of current? I would recommend the IC current limiter over the above transistorized version because it's much sophisticated in all respects.However if you are interested to go for the above, you may do so. 2. Assuming we want to use 1 watt LEDs (recommended) for the proposed 50 watt street light, we would require 50 numbers of these LEDs to be configured with the circuit. The circuit working of this 1 watt to 12watt LED driver may be known as presented under: The input mains 220V or 120V AC is half wave repaired by D1 and C1. Input under , over voltage and output short circuit protection required . I referred to the post wherein you recommended me LM338 for fixed 5A supply from car battery.

Thankyou very much for your quick respond,According to manufacturer data,the LED has 10 wATT AND 700mlamp.So that means,the max. For the previous circuit make sure the no load voltage is higher than the actual voltage of the LED in order to get the correct output current. The power consumed is 100 watts for optimal performance. The 100 watt LED module is one such marvel of modern science which has created a breakthrough in the field of LED lighting. These are easily available and cheap too. I can put the LED safely in 50v dc with current limit to 800mA? Please bring a camcorder DV/Digital-8 or any from someone for one day and test different footage with a single 100W white LED and check whether it creates any flicker or not.

Any heatsink requirements? Sir!still i am waiting of the remote module for this circuit.I hope you didnt forgot it.Thanks. For a 3 watt LED it's approximately 2.38 watts. Notify me via e-mail if anyone answers my comment. while calculating use the value "1.5" instead of "0.7" if you are using 2sc3320 for the lower transistor. Principle of LED Driver Circuit. That's it, once the above couple of simple tweaks are done, the driver now becomes perfectly suitable for driving the proposed 50 watt LED lamp module. hi,can i have the circuit diagram for 5w / 10w Led's? LED Strobe Light Circuit with Chasing, Flashing Effects, Illuminating 24 White LEDs from two 9 Volt Cells, Sequential Timer Circuit using Transistors, Voltage Divider Calculator Software – Potential Divider Calculator. Mr. Swagatam Majumdar, Thanks for your quick reply.Where can I find such an SMPS in Chandni Market, Calcutta, as I am in Calcutta?What would be the approximate cost of that SMPS?I need your assistance for one thing. Pls suggest a suitable part . you may refer to this article which is quite identical to your requirement: https://homemade-circuits.com/2012/09/led-emergency-light-circuit-using-boost.html, R1/R2 should be 47k each and C1 = 10uF/25V. Can you please tell me which transistors and resisters should I use. Required fields are marked *. An early response shall be highly appreciated. https://dl.dropboxusercontent.com/u/28291527/leddriver.jpg, Replacement Alternative for Obsolete 3 inch round 25 Ohm 1 Watt Intercom Speakers, How to safely wire 50 watt cob chip with ic driver on board. Thanks Sir,Sir Is the aluminum plate is the heat sink used in this. In the above sections we learned an SMPS design which can be used for driving a 50 watt LED lamp made from 50 numbers of 1 watt LEds. please! Kndly suggest suitable schematic diagram (circuit), appropriate ferrite core transformer design along with complete berger file using either TOP 247Y or TOP 248Y or TOP 249Y or TOP 256EN Switch.

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