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Led Driver Lm338

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Related Forum Posts: ASM vs. .asm vs. Reply With Quote 12-03-2009,10:11 PM #16 Illum View Profile View Forum Posts Private Message Visit Homepage View Articles *Flashaholic* Join Date Apr 2006 Location Central Florida, USA Posts 13,038 Re: LM and i made this circuit it is working very fine. how can I increase light...coz when i run this LED with 9Volt DC it brights light...pl solve my probs..

In this case, while the typical forward voltage [or Vf] to the LED is 3.3V the Vf is in actuality 3.7V at 800ma Okay, now you can solve your power loss I have been running these 24x7 for a couple years with no problems. I mentioned in my previous post that I wanted to convert a 110V 10W LED floodlight to 12VDC and also have the ability to flash as an emergency light. Good for reference, or you can just skip it...your choice. http://www.homemade-circuits.com/2011/12/simple-1-to-4-watt-led-driver-circuit.html

3 Watt Led Driver Circuit

they can handle 5 amps each! I don't really understand the point of chasing efficiency on the power supply side and then using a really inefficient LED. if possible please forward the details to my mail id [email protected]Swagatam MajumdarSeptember 13, 2013 at 1:59 PMHello Krishna,Please refer to the following post, you will get an idea of the required Then I hooked directly to the power supply and it lit up.

I'm using a 12V 3.33A laptop charger as my power supply. I have a 30W RGB chip that is an absolute joke at the light it outputs. LEDs need to have their current regulated. 5 Watt Led Driver Circuit Diagram I'm not sure about the LM338 but some power supplies have a different reading between load and no load.

I will be running two Crees I got of DealExtreme (XR-E Q5) in series off each regulator. 3.7V at around 700mA. And yes, add the capacitor, it is required by the LM for stable operation. I've attached an image of the buck circuit I've mentioned. Harald Kapp, Mar 29, 2013 #12 BlinkingLeds Joined: Feb 23, 2013 Messages: 180 Likes Received: 0 Location: Greece Ok when i say straight off the power supply i need with a

Pls. 12v Led Driver Circuit Diagram ReplyDeleteKENNY HOJuly 15, 2013 at 11:09 PMHow can I run 3x1w led using this circuit? Reply With Quote 12-03-2009,11:24 AM #8 Der Wichtel View Profile View Forum Posts Private Message Visit Homepage View Articles Flashaholic* Join Date Mar 2007 Location Germany Posts 829 Re: LM 338 Now if I can have the power supply run at about 34-35V, this would mean that the LM338 would have a volt drop across it of about 2.75V - 3.75V, This

  1. The input to the LM 338 IC can be from an regulated DC power supply, capable of supplying 12 volts at 3 amps or more.
  2. I switched the LM338 around and it seems to work?
  3. power supply will 9v 1700mahReplyDeleteRepliesSwagatam MajumdarMarch 26, 2014 at 8:03 PMGood day thurrmac,1700mAH will not support even one 3 watt LED properly, 5pcs is out of question, you may require at
  4. All rights reserved Privacy Policy · Terms of Service · User Agreement Register Help Remember Me?                Front Page What's New?
  5. The power supply may not work (or not work well) at the voltages the DHC tries to adjust to, so that's why I am not sure modifying an off the shelf
  6. The time now is 02:11 AM.
  7. I want to run these LED on 220Volt.
  8. Never really used ballast or LED drivers out of the box, only really just got my head around voltage regulators. (out of interest, was my theory roughly correct despite not considering
  9. were you refering to taking my +v line, into buck (or linear if need be) converter, to a string of LEDs, then to -v.

10 Watt Led Driver Circuit Diagram

Should I make 2 circuit that u selected for me for dim & head lamp. Source All Rights Reserved. 3 Watt Led Driver Circuit i am naveen abhyankar here i have some want issue i am making 15 watt led by using 12 volt dc supply.i am making them in series of 3(1watt*3*5=15watt)amp 4.5.but only 1 Watt Led Driver Circuit Diagram Thanks!So I've decided to make my 1st post a somewhat complex one (well so I think) I'm wanting to building a LED lighting unit for my marine fish tank due to

Reply With Quote 12-05-2009,05:33 PM #29 Carbon2010 View Profile View Forum Posts Private Message View Articles Enlightened Join Date Nov 2009 Posts 51 Re: LM 338 Driver Problems Well I saw DeleteReplysatish kumarFebruary 9, 2014 at 10:48 PMplease provide the circuit for 3w automatic emergency light and how many LED's need to put in this circuit ReplyDeleteRepliesSwagatam MajumdarFebruary 11, 2014 at 11:57 I have an 12v computer power supply and/or an 9v linear adapter same results with both. It would pose an issue for current regulators to measure voltage open circuit because it would expect a voltage drop using a load of some sort...for these cases a resistor wouldn't High Power Led Driver Circuit Diagram

The adjustment terminal can be bypassed to ground on the LM138 to improve ripple rejection. i have connected the led direct , it getting hot and ligts are flactuated,, ... LEDs: 10w chip white 900mA 9-12vClick to expand... see this picture i attached..

For example between input voltage and your regulator Last edited by Der Wichtel; 12-02-2009 at 05:20 PM. 5w Led Driver Circuit Diagram 230v Btw: the current is given in mA, not mAh. Measuring current is exact opposite, the meter is wires in-line, or in series with your load, where the only path for current to go is through your multimeter.

Last edited by a moderator: Mar 30, 2013 Harald Kapp, Mar 29, 2013 #18 BlinkingLeds Joined: Feb 23, 2013 Messages: 180 Likes Received: 0 Location: Greece But it is the complete

The first circuit has the LED current passing through the voltage stabilising element for the LM338 and the transistor affects the voltage divider thus reducing the output voltage if the current It seems like hardly using the gas when taking off from a red light in town, but then zipping along the highway at 100mph. or also you could connect it to PWM (the simple PWM could make with 555 ic, but it could only give you 1A current with 4-15V input0... 10w Led Driver Circuit Diagram Re: High Power LED Driver « Reply #5 on: July 29, 2013, 04:15:35 PM » Quotedrivers for <$20 on eBay...

I waited a long time and don't want to screw this up. I think there still must be something wrong with your circuit. Increases over 20 F do not appreciably improve the ripple rejection at frequencies above 120 Hz. is there any risk to run with 7809...?2.

Fairly oversized for use at 800mA. What better way than to do something 25 times over Also, I've just quit smoking so willing to get stuck in because it'll hopefully take my mind off it... what would be the best position of the leds is it in series?DeleteSwagatam MajumdarMarch 29, 2014 at 10:31 AMplease tell me the operating voltage of the LEDs, i'll provide you with Each regulator will run two LEDs.

I thought the LEDs would only draw as much as they need and only that? morethan 24V will work and change your resistor to 1ohmsmuhesuko.regency (author)hlemReply2014-08-15i think the heat would be problem. you could make option what type mosfet and npn transistor depend the spec of your HPL. set the meter to 10A and Check the reading after regulator?

We can see that the IC is associated with an additional active component which is the transistor connected to its ADJ pin. or link to the datasheet of the LED used here..?regards,josephReplyDeleteRepliesSwagatam MajumdarAugust 29, 2013 at 9:39 AMHi thanks,Different manufacturers may provide sightly different specs, one says it's around 4.5V as given here:http://www.lumex.com/images/Lumex_New2w_3w_5w-HPleds.pdfNo Have you considered the difficulty of spreading that light around? However, in the circuit I'm simulating, 7.638W in, 7.355W out, for (7.355/7.638)*100 = 96.3% efficient.

Logged Corporate666 Supporter Posts: 1898 Country: Remember, you are unique, just like everybody else Re: High Power LED Driver « Reply #8 on: August 06, 2013, 07:33:40 AM » Quote Jeff O. I made a water tank controller from ur blog. DIY projects are great but also appreciate when professional EEs pick the right parts, when a factory can get it all made, and delivered to you at a good price ready

Collection Intro123Introduction: Super Simple High Power LED DriverShow All ItemsThis Instructable will show you how to built a Constant Current for high power LEDs, using only two components.High power LEDs are Also, to add to my question, how efficient is your design?Artificial Intelligence (author)hlemReply2009-06-22Your setup looks fine to me. I got a reading of 8.8v. either address or web store published would be helpful to diy-ers.regards mandarReplyDeleteRepliesSwagatam MajumdarJuly 22, 2013 at 10:05 AMI am sorry presently I have no info regarding it.DeleteReplyAnonymousJuly 28, 2013 at 6:29

Some digital multimeters have more than one voltage selection as well as current selection...in addition to three ports for probes instead of two. I'd imagine using a couple diodes in series might work as an effective load. I was intending on making 2 panels each of around 100 LEDs (dependant on whether less makes the maths easier and the whole project less of a balls-ache). Reply With Quote 12-03-2009,10:53 PM #18 Carbon2010 View Profile View Forum Posts Private Message View Articles Enlightened Join Date Nov 2009 Posts 51 Re: LM 338 Driver Problems So just to