Questions tagged [led-driver]

An LED driver is a self-contained power supply that controls the amount of current and voltage supplied to an LED light. An LED constant current driver monitors the loop current of each LED and automatically adjusts the generated DC voltage output to the minimum value needed to produce the highest forward voltage. As mains power is AC and Light Emitting Diodes run on DC, this current needs to be converted by a rectifier

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Dimmable AC LED controlled by Arduino

I am a beginner, and I have a school project that requires me to use Arduino or any other microcontroller to control an LED light. After some research, I found out that not all LEDs support dimming, ...
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687 views

Ultra low ripple constant-current LED driver design

I designed a LED driver(SMPS configuration) with ILD6150XUMA1 and below is the circuit. I used it with AC/DC adapter. The thing is, th optical system is ultra sensitive and ripple from the LED ...
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How to output 5V from 3.3V MCU?

Big picture: I want to control a LUXdrive 3023 BuckPuck LED driver (3023-D-E-1000) from a Particle Photon (essentially an ARM Cortex M3 microcontroller). The MCU runs at 3.3V. I have tried a few ...
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will this system work? hi power led

Well doing this for my fish tank and i need some tips and advise. The idea is to use laptop charger for power. 19v 4.7amp 90w. Will use 25 leds that operates at 3.7v and 700mah and parallel em doing ...
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552 views

How to drive an LED with an LED driver

I found BCR421 driver and want to ask how to properly drive TSSF4500 LED. All the parameters seem to make sense if look separately, but where do I start to determine the necessary parameters? It ...
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2k views

Digitally-controlled 0-10A constant current source for driving LEDs

I'm looking to build a circuit to drive single high-power LEDs. The circuit will be controlled from a series of TTL pins: one for enable/disable, and ~4-6 to set brightness via current. The LEDs ...
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404 views

Cascading WS2803 LED drivers, each with different output current

I've decided on using WS2803 PWM constant current LED drivers. I'd like to cascade two of them and use the first one for 15mA output and the second one for 20mA output (each chip for driving different ...
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Is it OK to PWM a current source?

I want to control power RGB LEDs, for efficiency and safety they are better to be driven by a current source. I can use either linear or buck converters. I made a linear current source using ...
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Power consumptions of the following 2 LED driving circuits

I have simulated the following two circuits that can drive and pulse the LEDs.The transient result is shown on the right. The thing I am not sure is that which circuit consumes more power? My idea ...
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95 views

LM3405 (buck driver) dropout

I've built an LM3405 LED Driver, which works (seem) well. The LED have a 3.2V of Vf and works at 700mA. The regulator uses an external boost voltage of 3V (from an LDO). Reading the datasheet of the ...
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LED H-bridge driver

I have tried to understand the following H-bridge reference design used to drive 2 LED back-to-back. The following image only show one side of the H-bridge. Please correct me if I'm wrong. The P-...
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235 views

PWMing the output of a constant current driver

I have a set of LED panels that come with AC-DC constant current drivers. Is it acceptable to use a MOSFET to PWM the LED (MOSFET goes between the driver and the LED)? Also the microcontroller that ...
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How are led controllers able to switch high power/current without becoming hot?

I'm quite new to electronics. I'm trying to power a DC 12V 5A (max) led strip from my raspberry pi. I have constructed a (working) schematic where the main component is a IRF3205 MOSFET controlling ...
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Backlight LED Boost Converter testing

I am using LCD EJ080NA TFT with LED back-light. LM3410 is used as backlight driver. Schematic as below: But when I am testing it on hardware, I tried without load and with load. Without load, IC ...
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LED power supply design / lay-out

At this moment I'm working on a project that includes driving multiple LED interfaces. I've got 16 LED interfaces in total, each interface has two 5V inputs. One input for the high current LED drivers ...
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Mixed forward voltage LEDs in series with constant current driver

I've been looking for answers for a few weeks, so now I'll actually voice my question! My plan is to power 109 LEDs in series off of one constant current driver. The goal is to create supplemental ...
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320 views

Using a led driver as a led backlight inverter

Can i use a led driver to replace an led backlight inverter ? I have an old MacBook display (LG LP154WP2) and don't really know how to use the inverter board, because i can`t identify the ic on the ...
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204 views

Constant Current IC Driving a String of ICs

I have been having difficulty wrapping my head around the ideas of constant current and constant voltage. Basically I have assembled this circuit with an arduino. Now, imagine that I wanted to power ...
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762 views

Multiple led drivers for a single LED

I have a couple of moving heads like this They have a QCL (Quad color led chip) Theres a total of 10w. Most of the time I don't use the colors, I just use the white quadrant, which I presume is 10w. ...
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170 views

Multiple TLC5940s on PCB “dropping out” when many outputs turned on

I've designed a PCB to connect 12 TLC5940s to an 8x8x8 RGB LED cube through 3 64-pin headers, which I will include screenshots of below. I have a separate board for controlling the anodes for ...
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96 views

How to quickly switch power to a LED strip?

I need to switch a three sets 8 LEDs (1.2V each) in series with a current limiting resistor (~100mA) powered from 15V in under 500ns, about 2000 times per second, separately. The signal will be 3.3V, ...
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150 views

Buck controller MOSFET drive voltage

I am trying to design a switching regulator for LEDs, which uses the LM3405 as controller. This IC uses the BOOST pin to power the internal MOSFET driver, which controls an internal MOSFET. There are ...
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How to programme constant current of a LED Driver for various current levels?

I need to design a backlight unit that will change its duty cycle and constant LED current via a microcontroller. My supply is a SMPS with 12V - 20A output. I need to drive 16 * 16 = 256 LEDs(seperate ...
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1answer
550 views

TRIAC Dimming Modules - 60Hz Module on 50Hz Supply

I live in Ireland, on a 240V/50Hz supply. I run a Wink Hub, and therefore am bound to using US based Z-Wave frequencies, which usually operate on a 120V/60Hz supply. I have an Aeon Labs Dimming ...
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how to drive hundreds of LEDs [closed]

During festivals and marriages I have seen some decorations with LEDs which are hundreds in numbers (see attached image). Could you please provide some insights on the ICs used to drive such LEDs in ...
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330 views

In a circuit with the TI TPS61165, how was D2 chosen?

Looking at datasheet for the TPS61165, I don't see how they chose D2 - it looks like it will only work if the voltage supply is above 12v due to this diode, but the chip's input range is 3-18v. I ...
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Flickering LED on BP3106 based LED Driver

I have got a LED fixture with a flickering problem. As I am unable to check the output due to lack of equipment I would like to research and gather some information first. The switch used is not ...
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2answers
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Hacking a LED fluorescent tube

I'm trying to hack a LED fluorescent tube and PWM it with arduino and a TIP120 transistor . I bought one and disassembled it, basically it's an LED strip connected to a 220v though a LED driver. I'm ...
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1answer
83 views

DC power connections [closed]

I am building a fixture out of LEDs (COBs to be exact) and I'd like to use a 4 prong twistlock AC power plug for a DC connection. I know this is not recommended but hear me out. My drivers for ...
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167 views

Interfacing thousands of RGB LEDs in a matrix

So I have 3072 RGB LEDs I need to connect in a matrix. I have decided to split the project into smaller matrices and all LEDs are common Anode. Datasheet for LEDs is here: http://docs-europe....
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791 views

Why should we use LED driver chips instead of much simpler structures?

For example: I have two led driver chips: bcr321u and RT8474AGSP And think they both support to same output voltage and same output current etc. My question is about topological differences of them. ...
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Power supply for 5*10 watt SMD LED?

I am new to electronics, I want to connect 10 watt leds like below diagram. What power supply should I connect, and how to calculate the required power supply for any number of LED of any Watt. LED ...
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Power booster 12V to 36V for LED

I am busy with making a power booster from 12V to 36V to feed a LED with, the PWM is not the problem, but the coil, and the parallel schottky diode and to make a max level circuit is more difficult. ...
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Adjust the power of laser diode on both CW and pulsed mode

I am working on my graduation project to build a laser unit, i am supposed to control the power of laser diode when operating in pulsed mode and continuous mode. firstly, i had the pulses from "...
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136 views

What kind of transformer was used in this led driver? [closed]

I'm trying to examine the parts of the led bulb that I disassembled. I'm having a hard time distinguishing what kind of transformer is mounted on the circuit. I'm planning to build a driver for my ...
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1answer
6k views

LED lamp with more watts than LED driver

I bought a 40W LED lamp and a 40W LED driver to power the LED lamp however, the salesman delivered me a 36W LED driver. I called him to return the item and he said that this was the right way to power ...
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Is advisable to drive an LED matrix using a Shift Register+FET on High side and an LED driver on the low side?

Trying to find the most economical way to drive 60 leds (~20mA) for volume production. Our main MCU doesn't have enough pins, so I2C or similar set up is needed and total budget of driving LEDS ...
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3answers
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Avoid leakage current

I use an opamp driver to pump several amps through an LED. My circuit is below. simulate this circuit – Schematic created using CircuitLab When the input is low, I see a small leakage which I ...
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733 views

Advantage of using an op-amp connected emitter follower for LED driving?

I came across the following circuit used to set a microcontroller-controlled fixed current in an LED to around 100mA (target current): As far as I understand, the voltage reference at the IN+ (1.2V) ...
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How to build constant current circuit?

I am an amateur grower of Capsicum Cayenne Chilli and have been experimenting for some years with good results using Compact Fluorescent Lamps in a small indoor grow room, but I am now looking to ...
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1answer
496 views

Running LED on low voltage for a long time

I am trying to run a 0.5W white LED on a 2.4 V supply from a rechargeable battery. The LED needs a voltage drop of 3V to light up. My only constraint is to use commonly available components only. ...
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1answer
222 views

5v led string going brown!

I am installing 5V 1903 chip 3-wire LED-strings in model buildings and have constant issues with Brown-outs and getting white to be #)*% white. Have also used WS2011 which are pretty similar and cross ...
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Failed attempt to make LM3404 drive a 10W white led

I'm attempting to drive a 10W white led (ebay type, 8-11V, 1A) with a LM3404. I've approximated their reference circuit: I've used a 33uH (1.6A) inductor as L1 and a schottky diode (SS24, 2A 40V) as ...
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How to calculate the current in a PWM LED driver circuit?

I've been fascinated by the simplicity of the driver circuit based in the YX8018 in the prominent solar garden lights, they were able to simplify the circuit a lot in a simple boost topology by just ...
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2answers
498 views

Is it possible to build non-linear resistor using linear potentiometer

I have CAT4101 constant current LED driver and I need to control LED current. My idea is to use microcontroller and digital potentiometer (MCP41010) to control the current. While the potentiometer I ...
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135 views

Can I connect this LED drivers Signal and Power Grounds?

I am using a LDH-45 LED Driver (datasheet) with an I2C DAC as dimmer on the analog DIM pin. The DAC uses the same power supply as the Driver (with a linear regulator), so they share the same GND. ...
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2answers
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Driving high power LED using WS2811 or WS2801

I want to use either WS2811 or WS2801 to drive high power LEDs with spacing between LEDs up to 15 meters. These are going to be used outdoors or in a water feature. As you know WS2811 output is ...
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1answer
466 views

Advice on driving the DRL leds

I'm going to be using 2 sets of three 12v 9W leds, purchased from that well known auction site so that's all the info I have, as daylight running lights. Obviously I could simply connect them up (in ...
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1answer
864 views

LED constant current driver

I need a constant current of 400-500mA for each color of a 10W rgb LED. Each color consists of 3 1W chip is series. for 3 LEDs in series I'll need about 11 Volts for blue and 8 volts for green. So far ...
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243 views

Understanding reference application of LM3404

I'm looking at LM3404 to drive a 10W LED (900mA, 9-12V) with PWM. The reference schematic they give is the following: I'm trying to de-structure the diagram, and I'm struggling with the purpose of ...

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