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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How to calculate components values for LM3421 in SEPIC mode

How can I calculate the components values for LM3421 in SEPIC mode? In the LM3421 datasheet, there is not much information about SEPIC topology. (Section 9.2.9.2 is labelled "Detailed Design ...
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Possible damage to LED or driver from PWM power source and flickering? [closed]

I recently upgraded my car's headlamps from halogen to LED bulbs with integrated drivers (I believe this is the specific product), and I discovered that they flicker when the lights are on in "...
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Significance of LED number in selecting inductor and capacitor values in backlight driver circuit

I am looking to configure an LED backlight driver circuit and had a couple questions I was hoping I could find some answers for. My application is a TFT LCD screen with a single anode/cathode input ...
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Driving parallel channels with 1 PWM signal [closed]

I am currently developing a protoboard for an LED driver having PWM control for dimming using a microcontroller. I plan to drive a number of parallel channels of LEDs ('n' number of RGB channels) and ...
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Is there anything to limit LED output dimming 50% while the wall dimmer controls 50% to 0%?

We got a project for a client but our lights are too bright for the space, we still want to sell the the lights because we have extra inventory and need a way to dim the LED output to 25W instead of ...
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LED driver short output & single LED issues LT3477

I'm using the LT3477 IC for operating up to 6 LEDs in series. The LED that I'm using has Vf = 2.9 V and has maximum current of 350 mA. Circuit input power is 5 V@2 A (J1 and J4 on schematic). There is ...
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Improve thermal effeciency of buck LED driver with fixed supply rail

I have this driver circuit that uses an ILD8150: There are two identical sections of this module on my PCB. One powers 6 LEDs the other powers only 2 LED. The Vf of the LEDs is 2.85V @ 350 mA. So the ...
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Transformer humming after replacing halogen bulbs with LEDs

I replaced the IKEA 10W G4 halogen bulbs in my under-cabinet lights with 1.5W G4 disc LEDs and the 120-12V AC transformer started buzzing, but not if I kept one halogen bulb in. I recall reading ...
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Power hundereds of LEDs using shift register

I have 400 LEDs I need to drive with a bank of 75hc595s. My problem is that the controller is a raspberry pi zero and the max input for it is 5 V at 1 A, however my LEDs are 3.0-3.2 V at 20 mA or 8 A. ...
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Understanding why Meanwell LDD-350H outputs > 350mA current

I built a LED light for my aquarium. I used 140 various 1 W power LEDs, driven by 14 constant current Meanwell LDD-350H drivers. Each driver is handling between 8 and 11 LEDs. I use 36 V power supply. ...
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How to drive multiple floating N-channel MOSFETs

I want drive a RGBW-LED (CREE XLamp XM-L) using a synchronous constant current buck. To control the brightness and color, the LED of each color channel is controlled by a shunt transistor using PWM. ...
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Relay contact sticks-Led driver

I m using relay 230vac/10amp to switch on/off LED driver. But sometimes relay sticks. Loads are nowhere close to 230v*10amp=2300watts. I cant understand what is causing this. i tried connecting an NTC ...
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Current in inductors of emi filter

I am currently working on an EMI filter for a led driver (constant current). Here you can find the according schematic: My question now is, which (if any) current is going through the inductors/have ...
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EMI Filter - current in inductors / part selection

I want to use a NLDD-1400H LED Driver as constant current source with 1.4A ouput. On the last page of the datasheet there are information about an EMI Filter, I want to use. Here is the schematic: ...
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When running a wireless charging circuit, my power supply whines and the transistor gets super hot even though everything works, is anything wrong?

I created a wireless LED power circuit to drive adafruit wireless LEDs.The circuit works great, LEDs are fully lit but my desktop power supply lets out an awful whine whenever its running (it normally ...
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Step up PWM signal from 3.3V to 10V

I am trying to control an LED driver using a PWM signal but unfortunately the Raspberry Pi Pico is using 3.3V on PWM and the LED driver specification sheet specifies 10V. What can I do to step up the ...
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Trying to understand RC circuit with alternate voltage in LM3409 LED driver data sheet

I've been working on designing a circuit that uses the shunt-FET approach documented in the LM3409 data sheet, wherein a MOSFET is place parallel to the LED load, and is driven by a PWM signal to ...
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Can I use a constant voltage and constant current LED driver to charge a battery?

I can charge a battery with a bench power supply by setting desired voltage and current. Is it possible to use, for example, this LED driver in the same way? I just want something cheaper, more ...
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Question on resistor voltage dropper values for VCC supply of LED driver IC

I was designing the PCB for a 10 W LED driver with the AL1676 controller. From the datasheet, the application circuit shows that the driver takes its VCC supply through R1 and R2. The maximum value ...
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How to electronically switch the output of an LED driver between two different 10W LEDs?

I have the circuit in the image below working with the PT4115 driver. I use it to light a 10W LED from a 24V DC source. The LED draws close to 1A. I can control it with a 5V PWM signal from an MCU. ...
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Driving LED module using CC driver

I am using 3x10 COB LED along with CC driver that is 960 mA, 30-35 V and the connection type is series-parallel. Now the issue is if one of my string fails so will it add up to the remaining LED or no?...
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2 answers
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Inrush current handling for relays

I am building a controller (ESP based) to sit in front of a Meanwell LED Driver (HLG-150H-12B). I intend on using a trigger relay module to switch the 230VAC-Live into the HLG, however I am slightly ...
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Driving 6 LEDs in series with current control

I'm looking at driving an LEDs, maximum 6 LEDs in series (can be less.) I have used the LT3465ES6 for this job. I have calculated the needed current limit resistor and didn't get the needed results (...
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Identifying a communication protocol found on a RJ14 cable

I have a LED panel controller that can daisy chain with an another led panel controllers using a RJ14 cable to adjust a PWM that dims the panel. This is what I see on the RJ14 pins. A periodic signal ...
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Inductor position in low side buck converter

I am designing a PCB to control an RGBW-LED. To provide a regualted current for each color I am using the LM3407 buck converter from TI. The buck converter is powered with 12V and is configured to ...
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Roughly how fast can a constant current LED circuit ramp to 1A without EMI issues?

I have a constant current circuit supplying a 1A LED for a carefully controlled strobing application; for my application the LED needs to turn ON (no dimming) for ~1ms and then OFF (fully off), at a ...
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How to fix LED fixture not turning off completely when the switch is off

I have LED ceiling lights that are not completely turning off even when the switch is off. Sometimes the brightness of the glow is just to much for me and finally decided to do something about it. ...
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4 votes
2 answers
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How to achieve constant current around 325mA for a 1W power LED with low headroom voltage

I built the circuit suggested by @MicroservicesOnDDD in their answer to this question: Low Overhead Constant Current LED Driver and had a play. Here's the circuit in the linked question: The most LED ...
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How to I optimize this LED circuit?

The Project This part is pretty simple: I'm building a stunt lightsaber up from scratch. The led is held in a heatsink housing inside a 1 inch (internal diameter) aluminum tube. The heatsink is rated ...
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Understanding part of TI AN-1839 LED Dimming Schematic

I'm trying to evaluate LED drivers for a project I am working on, and I came across this reference design for the TI LM3402/04: https://www.ti.com/lit/ug/snva342e/snva342e.pdf. The design employs a ...
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Ways to Control RGBW LED Strip

There are these RGB & RGBW LED strips with a common anode (V+) input that I want to control. In the past, I've built circuits around the AL8861Y-13 LED driver IC that can control RGBW LEDS if all ...
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LED Driver Advice Reqd

I'm looking to put LED strips into my converted van. Using some before, it wasn't long before they dimmed or individual leds failed. I was told it was because automotive voltage, especially on newer ...
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Can a constant-current LED driver with a reference resistor be dimmed?

I have a scenario similar to Tuning a constant-current LED driver, per channel: also considering use of two TLC5928 but with If <= 20 mA per channel 28 channels have Vf ~ 8V < 9.6V 4 channels ...
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How are standard consumer LED dimmers built?

What would be a circuit of a shelf consumer LED dimmer that works, let’s say, with a potentiometer? Is it important/more efficient to have the dimmer circuit integrated with the 230V mains to 12V/24V ...
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A6211 works fine alone, but when I merge two A6211s on the same PCB, there is a current leak

I need some help; I probably lack electronic knowledge here. I got an LED driver circuit from Allegro. It uses the A6211 IC. First I tested it on a protoboard and it worked fine; I controlled two of ...
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What's inside an E10 LED bulb?

What's inside an E10 LED bulb (a 3V flashlight bulb) that allows the LED to light without worrying about current? Is there a tiny LED driver inside the bulb?
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Balancing current with resistors when driving parallel strings of series LEDs with constant current

I'm designing a light source that will employ a grid of LED emitters powered by constant current drivers. The LEDs will be laid out in a parallel/series combination, in rows of 8 emitters in series, ...
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TPS9264x Synchronous Buck Controllers for Precision Dimming LED Drivers

I have some questions about TI's TPS92641. Please see below: 1.) Does anybody know the principle of Chopper OTA? there are no too much information in the datasheet. 2.) What's Quasi-hysteretic ...
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How can I power these LEDs?

I'm trying to build myself a binary clock with a NodeMCU v3 and I am trying to figure out a way to power everything. I'm trying to use these Pololu 5 V RGB LEDs. They are 5 V, 50 mA LEDs. I need 20 of ...
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UK Plug Adapter for LED light [closed]

I bought an LED lamp from Germany and it arrived with an EU plug and a UK adapter. I don't really want to use an adapter on it all the time fixed in my home (And also, the adapter they sent actually ...
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LED flickering when turning off and ESP32 PWMing

I am currently working on a LED system prototype using 3W LEDs. I am using these LED drivers but the 700mA variants. It is based off the XL4001E1 constant current chip, datasheet I used for reference ...
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LED Dimmer circuit accidentally damaged

I am currently working on a prototype system that uses these 3w LED drivers (I am using the one with the picture at the right). It uses the XL4001E1 CC DC-DC converter capable of outputting 700mA to ...
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3 answers
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Need advice on an LED dimmer 0-10 V circuit

I've setup a small system where I can control a 6 W LED. I change the brightness of the lamp by adjusting the signal 0-10 V. Diagram (2) is the waveform while connecting with a phase-cutting dimmer ...
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Why is my calculated wire size a lot bigger than the traces on my LED strip?

I've 3D printed a nanoleaf assembly which will have WS2812B LED strips in them. I'm calculating the correct wire size but my result seems off. I have 14 hexagonal parts which have sides of 10 cm. I ...
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AL8853 Boost LED driver does not oscillate

I realized this board from my schematic based on the AL8853, a boost LED controller. My circuit is calculated for a high power design (735 V LED output, 350 mA LED current). Before powering my board ...
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Can I drive LEDs directly with an LM2596 DC to DC converter? [duplicate]

I'm aware that LEDs need to have their current limited and cannot be connected directly to an unregulated power supply or they will 'blow'. However, can I use a LM2596 DC to DC converter to drive ...
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Supply for not yet defined power LEDs

I'm currently designing a PCB for a caving robot. For most "main" features, I start to know quite well the precise requirements. On one point however, there are still many unknown factor: ...
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5 votes
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Understanding a sub-nanosecond pulse generator

I have been reading a couple of papers (1,2) that use a Step-Recovery Diode to generate sub-nanosecond electrical pulses, for the purposes of pulsing an LED. I am simply trying to understand the ...
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Issues with LED driver circuit not showing any light

We are currently seeing some issues with an LED driver circuit. I am not sure about root cause because there are too many variables. During operation the LEDs are dim or do not light at all (after 2-3 ...
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RGB LED driver, PWMs seem to interfere with each other

I have inherited a project from colleague that is leaving the company. This project is a RGB LED driver with three LEDs, red green and blue, that uses an Elmos E521.36 chip. Its datasheet is available ...
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