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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2 answers
348 views

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?...
2 votes
2 answers
312 views

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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154 views

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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1 answer
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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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3 votes
1 answer
66 views

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
178 views

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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1 answer
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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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1 vote
1 answer
164 views

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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1 answer
159 views

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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1 answer
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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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2 answers
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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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3 answers
352 views

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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1 answer
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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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1 answer
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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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3 answers
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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 ...
1 vote
1 answer
89 views

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 ...
-1 votes
3 answers
212 views

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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4 answers
264 views

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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1 answer
118 views

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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1 answer
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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
1 answer
373 views

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 ...
0 votes
1 answer
85 views

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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0 answers
94 views

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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1 vote
3 answers
630 views

Is it safe to attach COB LED light strips to a desk with a metal frame?

I am kind of new to electronics, and I wanted to make sure that I am not doing something dumb. My SO and I work on one big desk, 177 inches / 4.5 meters long. It has a metal frame and a MDF desktop. ...
2 votes
1 answer
139 views

Can't read power from this product description (10W + 10W notation)

Here is the product in question: https://www.ledbe.com/24v-cob-tunable-white-led-strip My question is: what does it mean by Output Power: 5W+5W, 10W+10W, 15W+15W? ...
1 vote
1 answer
172 views

Knowledge requested for WS2811 Based RGB LED driver Module

Design of LED Module based on WS2811 LED driver IC (Only Red-channel is shown). To the right of the schematic you will find a simple, cheap and robust constant current LED driver. The current for the ...
1 vote
0 answers
179 views

Using constant current and constant voltage power supply with LED strips

I have a Meanwell 12V power supply (ELG-200-12) which is constant voltage and constant current. Note 2: I want to power t one 5 meter 12V LED strip that consume 11.52W/m with it. The specifications ...
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1 vote
1 answer
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orcad pspice simulation

I am trying to simulate this OrCAD PSpice simulation based on TLD5045EJ (led driver IC) which I have downloaded from Infineon website. They already provided a test setup file for simulation, I have ...
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2 answers
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7segment driver with PIC microcontroller

I'm trying to drive a 7segment using PIC microcontroller. This is the circuit diagram: In the picture, PIC means some ports of the PIC microcontroller. I want to pass 3 mA through each LED, and since ...
4 votes
2 answers
599 views

LED Driver Design

I'm trying to make a transformer-less LED driver with some high power LEDs and found I this circuit with a 130 mA output: Can someone explain for this circuit: Do the voltage changes depend on the ...
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1 answer
116 views

LED string control

I have 10 strings of LEDs, string 1 to string 6 have 4 LEDs in series, S7 and S8 have 3 LEDs in series, and S9, S10 have 6 LEDs in series. Each LED has a forward voltage of 3.2 V on average. I'm going ...
0 votes
1 answer
68 views

AL5873QT16E-13 LED driver

I have a requirement wherein strings of LEDs need to be driven with a maximum forward current of 250 mA, and the dimming should be analog, not PWM. I have chosen AL5873QT16E-13 which has 3 channels ...
0 votes
1 answer
110 views

Need help making sense of PWM circuit with an Arduino. I do not understand the voltages I measure

As you may have guessed from the title, I am a beginner in electronics so please forgive any absurdity that might follow. I am playing around with powerful COB LEDs and how to drive them. To that end ...
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0 answers
81 views

How to supply an OLED module with 13V?

I have an OLED module that uses 3V for logic signals and 13V for the LEDs. What is the common way to drive the 13V for OLEDs? With a regulator or some kind of special LED driver? I have seen some LED ...
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4 votes
3 answers
270 views

Why does this MOSFET heat up?

Does anyone have an idea why this MOSFET warms up in this circuit? In simulation everything looks good, but the real MOSFET heats up to around 60°C. I am designing this circuit for 1.2A. Measured ...
0 votes
3 answers
553 views

Connecting LEDs in parallel using constant current driver

I need to drive 4 high power LEDs. Because of their high power, they cannot be connected series as the voltage required by 4 in series would be too high. Their high current requirement (500mA) also ...
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1 answer
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Designing UVC LEDs strip using WS2811 LED driver IC

I'm designing a UVC LEDs strip using WS2811 LED driver ICs. I'm using the Vishay UVC emitting diodes [3] having the forward voltage of 6.8 V and the radiant power typically 2.5 mW at 20 mA. I used one ...
1 vote
2 answers
264 views

What is the right transistor to control a 3 V load with 12 V PWM signal

The schematic on the left is for an RGB light kit that I want to install in a car to replace the stock LED. As shown the RGB LEDs have common anode that is connected to 3.0 V, and there is a micro-...
8 votes
4 answers
3k views

Can I send PWM through 1 meter cable?

I am working on a project where I need to drive two LEDs on a PCB (= PCB_LED) which is 1 meter away from another PCB (= PCB_MCU). The PCB_MCU includes a microcontroller with two LED drivers. Each LED ...
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1 answer
78 views

LED drive circuitry:

What is the importance of R1,R2, transistor and C1 in this attached circuitry.

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