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Buck Led Driver Schematic


Show All Exactly what I need about 4 months ago by Member #588133 verified purchaser I take old outdoor lighting that ran on AC and convert it to solar powered decorative Instructables will help you learn how to make anything!I'm in!About UsWho We AreAdvertiseContactJobsHelpFind UsFacebookYoutubeTwitterPinterestGoogle+ResourcesFor TeachersResidency ProgramGift Premium AccountForumsAnswersSitemapTerms of Service|Privacy Statement|Legal Notices & Trademarks|Mobile Site© 2016 Autodesk, Inc. Purchased Together Arduino Uno - R3 In stock DEV-11021 This is the new Arduino Uno R3. SparkFun Recommended LED - 3W Aluminum PCB (5 Pack, Green) In stock COM-13185 So much power and light from such a small package. check over here

U=RI, and R is 1 Ohm. Submit SparkFun Electronics Niwot, Colorado Customer Service Site Map Terms of Service Privacy Policy Desktop Site Your Account Log In Register ×Close Log In Email Password Forgot your password? You could use it to drive a string of high current LEDs such as 1.5A or 3A from Li-ion batteries. As the Q3 turns on, current flows through L1, LEDs, and the current sensing resistors.

Constant Current Buck L.e.d. Driver

This is a ve… 0.95 3 Favorited Favorite 19 Wish List Added to your cart! I try with some inductor (with value between 47 uH and 100uH) but the maximun value of current is not 350 ma ! If so how did you do it?


Hi ed-999,

Did you tried out the circuit with specified changes ? Update your browser to view this website correctly.

Purchased Together Triple Output High Power RGB LED In stock COM-08718 Do not look into the light. Cycle-by-cycle, true constant current circuit Configurable output current up to 1A Up to 15W maximum output power. (at supply voltage 20V with five 3W LEDs connected) Current control potentiometer (trims the It's list of features includes: Inductor "switch mode" (buck) converter for high energy efficiency. Constant Current Buck Converter This PWM control works within the current level set by the current control pot.

Depending on the power supply voltage, Poorman's Buck can drive up to 6 LEDs connected in series. Buck Converter Led Driver Circuit The chart below shows the number of serial connected LEDs and the required power supply voltage.Number of LEDsMinimum Supply Voltage15V29V312V415V520V You can series-parallel connect LEDs to drive more LEDs as needed. If The source of the PWM control is not limited to microcontrollers. When it is turned the other way, it will be sensing 1k/21k * 0.7V = 33mV. (The description says the ratio is 1:11 but maybe I'm wiring it differently).

Let's assume that

I feel like this should be mentioned in the technical description. Constant Current Pwm Led Driver increase to burn and i can not know what happened is any one can help me i need this ct. I believe at idle,it generates 11vac and 14vac at peak rpm.

Is there a way out to this without introducing a linear regulator?Hello, ledartist.
I have some questions about modifying the buck Which means that for the comparator to trip, the current has to pass over 367mA.

Buck Converter Led Driver Circuit

I wanted to proceed with 48W at 12 or 4A. http://www.ti.com/lit/ds/symlink/lm3405a.pdf For which department? Constant Current Buck L.e.d. Driver Fixed now. Poormans Buck You know you want to, but boy will you be sorry. 1W per channel, RGB High Power LEDs in one alumi… 14.95 3 Favorited Favorite 10 Wish List Added to your

You should still be able to keep Vgs in its safe range.

Very nice instructable, thanks for sharing! http://linuxcrypt.net/led-driver/buck-led-drivers.html Thanks


for switching you used a n channel mos. My input voltage is 21 and the output is 5 V. could you help me please.


Hi, I'm interested in buying the kits, but I can't find it on your website. Step Down Led Driver

seems odd there is such a price difference so just clarifying so i get the correct item. SparkFun Recommended SparkFun LED Driver Breakout - LP55231 In stock BOB-13884 The SparkFun LP55231 LED Driver Breakout is a self-contained solution for developing and deploying the nine-channel I2C LED c… 7.95 As the current gets higher, the voltage at the comparator's negative input pin increases as well. http://linuxcrypt.net/led-driver/buckpuck-led-driver-schematic.html I'm sure many of you are incorporating LEDs as light sources in your projects.

The Poorman's Buck doesn't get very hot when operating - only get warm. Constant Current Buck Regulator SparkFun Recommended SparkFun Large Digit Driver In stock WIG-13279 The SparkFun Large Digit Driver is a chainable controller backpack that can be soldered directly to the back of our large [6.… Compact design - only 1 x 1.5 x 0.5 inches (excluding the pot shaft) This is not my design and I take no credit for making this.

Voltage between 5 to 20V can be used.

  • Similarly, Q1 and Q2 can be almost any general purpose type transistors.
  • Here are samples of a few configurations: Output Current R2 Value Use R11? 350mA (1W LED) 10k No 700mA (3W LED) 10k Yes 1A (5W LED) 2.7k Yes The current control
  • Version 12 of the board adds a solderable jumper that can be closed to increase the maximum current to 660mA.
  • That's why we're adding to our line-up of Arduino-compatible microc… 19.95 41 Favorited Favorite 36 Wish List Added to your cart!

Please let me know at earliest.

Thank You

I'm also thinking of an application requiring about 2.5A @ 14ish volts... forward current lower than 330mA… Also: Could you use this device to dim a LED down below its forward current(current needed for the LED to light up at all). Related Tutorials PicoBuck Hookup Guide V12 February 18, 2016 The PicoBuck board is a high-efficiency three-channel constant-current LED driver. Boost Led Driver This 5 pack of green 3 Watt aluminum backed PCBs is sure to shed a lot of … 7.95 Favorited Favorite 1 Wish List Page 3 of 6 Added to your

Thank you hanlin_y for bringing this to my attention.

I need some help with the schematics. Mountain Time: (303) 284-0979 Chat With Us sparkfun.com Shop Learn AVC Forum Data Shopping Cart 0 items log in register Shop Learn Products Start a Project Products Blog Tutorials Videos Wish So that leaves the other parts in the power side to the circuit (R10, R11, L1, and D3).

By making the following changes, I think that the output current can have a peek at these guys The output LED current flows through R10 and R11 (current sensing resistors).

Did your modifications work?



maybe someone will pass by here...

what parts of the schematic could i avoid repeating if trying to make a 3 channels version of this? I have tried different solution but had no luck.
1) Tried voltage divider of two 1KOhm resistors. This method of controlling current is often called "cycle by cycle" current limiting. (This "true" current limiting also works as a buit-in short circuit protection. Will it be a problem if I only have 16v rated 100uf caps and not the 35v rated?

Thanks again!

C2 value is not that critical, so use 2 x 1uF or 4.7uF

I'd like to build your circuit, but I have very small place. It's thin! XaviG / about a year ago / 1 / try this one https://cdn.sparkfun.com/assets/learn_tutorials/4/4/3/PicoBuckV12Schematic.pdf Member #161771 / about a year ago / 1 / So I literally purchased the previous version to You can omit the potentiometer and replace with resistors if your project doesn't call for it.

Power supply can be one of ... 6 Step 6: Amendment!(As of Aug. 9, 2012) The power supply voltage range wasoriginallyquoted as 5 to 24V. I'm thinking of making my own design for the PCB with all SMD devices, except for the inductor. However the most popular comparator IC (LM393) has two comparators in it. Please help.


i have question what is the value of resistance of the inductor L1.

are the 3 on the pico isolated so they can be cut apart? what kind of luck did you have? It lets you use a lower powered zener diode.

If the signal MOSFET turns on, the BPJ transistors' bases should receive 10V and cause TP2 to be 10V. A portion of each sale is given back to him.

This is a 5V Arduino running … 9.95 106 Favorited Favorite 77 Wish List Page 4 of 6 Added to your cart! Quick question, would I be able to use this circuit to power two 10W 1A 9-12V high power LED's? Which components can I remove to get a non PWM model? I should be able to harvest some from something...

Looking forward to your next instructable 8)

I made a bunch of them and very much enjoyed working through this.