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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3answers
61 views

What’s the difference between led current draw with and without PWM?

I have a LED that’s rated for 3W (aprox 3V and 1A max current) Do I get the same result in terms of current draw and led’s durability if I supply the led with a 1A Led Driver (at full current supply, ...
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60 views

26 Led Array Component Identification and Failure Cause

I have the following LED lights. These lights keep failing on me. I'm suspecting that the DPAK(U1) component is failing but I have no clue what it is. The markings on the DPAK reads 5ZYl8GF6D. I'm ...
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1answer
56 views

MOSFET for switching single LED

I try to design a cost-effective but still "reasonably engineered" way of driving a single white LED with a micocontroller with the following "specs": For the single white LED no extra boost ...
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1answer
42 views

transistor heat

I am making a constant current source as a adjustable.The maximum current flowing 1 amp. I immobilezed the current as a 570 ma, using a bdx53 bjt. Bjt collector emitter voltage is 10 volt. This ...
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57 views

LED PWM with FOD8342 Optocoupler

I'm trying to PWM some high power LEDs from a isolated control line using a FOD8342. It worked on the bench when prototyping, but now it's part of the final design it seems to work for a minute then ...
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3answers
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Do I need additional power for an IR LED diode 50 feet away from a Raspberry Pi?

I'm creating a central remote to control my mini-split HVAC units. Those units are controlled with an IR remote. Each unit is in a different room of my house. I have everything working on my ...
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4answers
80 views

Precision Current Sink for LED Modulation

I one of my first designs, I am attempting to simulate a high precision optical transmitter using an LED by varying the brightness in linearly with the incoming signal. The input signal is BFSK, ...
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3answers
42 views

LED ceiling light with mismatch driver [closed]

I am new to the forum, so please forgive me if I am asking a stupid question or posting the wrong thing at the wrong place. I recently bought a Led ceiling light online that comes with a remote ...
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46 views

RGB Illuminated Potentiometers

I'm currently designing a circuit using Alpha RV141F-40-20BL-B50K Potentiometers which feature a clear shift into which a 3mm LED can be inserted. My initial plan was to just fit a WS2812B ...
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2answers
80 views

Using the ULN2803A

I'm so confused. How does this chip drive 8 LED's when there is no apparent power source? What am I missing? New design based on comments.
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2answers
41 views

LED Driver with relatively high capacitance on PWM input causes PWM signal to be laggy

I am using three Meanwell LDD-600L LED drivers (datasheet) to control brightness/color of a 50 Watts (total) RGB LED. This driver has a PWM input which I draw low with a PC817 opto isolator. ...
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Driving 34 White LEDs in Series with Linear CC Source with 110V Mains

I have 102 White LEDs in total and I want to drive them from the 110V rectified Mains in 34S 3P configuration. Here's the graph about the LEDs (Red Line). I want to pass only about 50mA ...
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1answer
44 views

Using LED driver as PWM digital outputs

I'm building a robotics project where I need to control a lot of DC motors. I picked the DRV8870DDAR H-bridge motor driver chip which needs 2 PWM input signals to control the speed and direction. ...
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109 views

LED driver: how to choose current and voltage?

In my project I have a microcontroller which has to light 3 groups of LED. Group A has 3 LED, Group B has 2 LED, Group C has 1 LED. There are all the same LED. In each group the LED are in series. ...
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106 views

0 - 70mA led driver

For a project, I want to detect the red part on the moving disk of Ferraris electricity meter. I want to do this with an Infrared LED and a phototransistor that receives the reflected light. The ...
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38 views

Switching between two independent RGB controllers

I have two independent 12v RGB controllers with different modes. One is a music controller and the other one is a normal RGB controller. I planned to install a switch so that I can choose which ...
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3answers
93 views

Meanwell LDH-45 LEDs Glowing When Controller is Off

I'm using a Meanwell LDH-45B-350 Dali driver for currently 4 Bridgelux BXRE-30G0800-D-73 LEDs with forward voltage of 18v at 350mA. The problem is when I switch off the driver, the LEDs still glow a ...
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28 views

0-10V dimming down issue on control circuit stops

I am facing one issue in the interfacing between 0-10V control and LED driver. Circuit configuration: Attached is the circuit flow/interface . 0-10V is generated through PWM interface mentioned in ...
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2answers
1k views

Why do most flyback converters / LED drivers operate under 100 kHz?

Most of the LED drivers and flyback converters I have come across operate in the 60-100 kHz range. Is there any particular reason behind this - example - ferrite cores not being able to handle higher ...
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1answer
260 views

What will happen if I connect a resistor to a constant current LED driver?

What will happen if I connect a 120 Ohm resistor to the outputs of a constant current LED driver designed to provide 0.600mA (24 - 38 volts)? According to Ohm's law this resistor will allow a current ...
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0answers
55 views

Dual MOSFET Switch Circuit not switching

I'm trying to switch a high-current, 12V load (large parallel LED strip, with the anode connected to LOAD-) using a PWM chip. My approach right now is to use a ...
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0answers
45 views

Designing LED Ciruit for Video Lights

I am designing circuit for video light. The requirement is as below - I got two LED chips 100Watt each with different color temperatures. One is 3200K and other is 5700K. I want to switch on one ...
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33 views

Controlling a series of LEDs ( AC->DC via bridge rectifier)

I'm working on a PCB (Christmas Present) to take in A/C to a string of LEDs and control them (with transistors? and a microcontroller). This is a bit out of my league, but it is making me learn ...
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1answer
46 views

Driving parallel LED strings

I need to drive and dim 4 parallel LED strings. Each color (see below) dims separately. Another constraint is minimising the number of wires running from the light to the driver. Here are my options ...
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1answer
52 views

Simple blinking Led with control over both the pause rate and flash time?

I was hoping someone could help me understand a very simple approach to creating a flashing led. While many simple examples exist, I cant quite find one that allows me to control both the pause rate ...
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1answer
74 views

Why can the IS31FL3731 only handle 32 RGB Leds when it can handle 144 Regular ones?

I am looking at using the IS31FL3731 IC in a project soon, but I am confused as to why the data sheet says that the circuit can only use 32 RGB LEDs when it can use 144 regular LEDs. The data sheet ...
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1answer
219 views

MeanWell 3-in-1 dimming

I've got a constant current MeanWell LED driver that has 3-in-1 dimming (100k potentiometer, 0-10V signal or 10V PWM), and would like to control the dimming with a microcontroller. I found a few ...
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3answers
91 views

Solar power backed circuit to light 1W LED

What I have achieved so far: Referring https://www.instructables.com/id/BUILD-A-NOCTURNAL-SOLAR-LIGHT-BULB/ , I have successfully built the solar garden light circuit to light a 5mm LED using ...
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2answers
76 views

Trick monitor into receiving signal [duplicate]

I have the plan to convert a few old LED backlit monitors into false windows. While I theoretically could buy direct LED drivers to power these panels, I'd prefer to keep the existing circuitry, since ...
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2answers
51 views

Connecting grounds of two LED drivers

I'm using these Mean Well LDD-H DC-DC constant current step-down LED drivers to drive these LEDs. What I'm seeing is that when the -Vout terminals of the drivers are connected together, both LED ...
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0answers
35 views

LED Driver Using Boost Converter, startup problem

I am trying to drive a led using a DC-DC boost converter. The circuit worked at first, I ran the led for 2-3 hours without issue (a few days ago). Today I flipped the switch to turn the led on and ...
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1answer
119 views

LED light bulb in series or parallel?

I have been exploring how LED light bulbs work and the circuit inside of them. One particular question I have is how the lights are actually arranged? LIFX, for example, has 4 different types of LEDs;...
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1answer
76 views

What rating of constant current LED driver do I need? [closed]

I've recently finished building some understairs cupboards. I fitted a 9W LED light into the cupboard which comes on when the cupboard opens. It is driven from this LED driver. I've measured the DC ...
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2answers
128 views

Issues with driving LEDs with a CC driver

My circuit consists of 16 MP-3030-1100-40-90 connected in series which I'm driving with this CC driver @ Vs = 48V. I'm setting the current by changing the voltage on the control pin. I'm having ...
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1answer
49 views

Buck convertor calculation on Vout close to Vin

I'm currently stuck in calculating the right inductor for driving very bright LED's with The TPS92518 led driver. (http://www.ti.com/product/TPS92518-Q1) This is a 2 channel LED driver and on every ...
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4answers
87 views

How can I control 2 or more seven segments displays using a single microcontroller?

Is it possible to control say up to 4 seven segments displays using a single microcontroller and having some I/O ports left? For example, say I would like to show a reading with 4 seven segments ...
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52 views

Cree XHP70 LED Drivers at 6v / 12v

I have some questions regarding Cree XHP 70 LED Drivers. I have 2 LED drivers Cree Model XHP70 from kaidomain. I want to run a LED at 12v. xhp 70 spec Maximum Drive Current: 4.8 A (6 V) / 2.4 A (12 ...
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2answers
73 views

A DIY Power supply system for a 150w high power led engine

I have this SST-300 High-power LED which requires 10A and 12-14V as described in the product characteristics. The product is suggesting with its own power supply as well as its own constant current ...
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1answer
55 views

LEDs flicker when I move my circuit

I'm building an LED driver circuit, CD4504B and TLC5916 controlled by a Raspberry Pi: simulate this circuit – Schematic created using CircuitLab I'm finding that sometimes when I move the ...
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4answers
361 views

Multiple switching LED drivers on single PCB

I am working on a high power LED board project. It requires to have 100 LEDs, of different types and colors. There will need to be 17 individual strands (need to be able to dim them separate.) Max ...
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1answer
37 views

Driver circuit calculations

I am attempting to built this circuit here: It is used by an LED manufacturer to provide pulses to a high-power LED. In my case, I'm using an ARDUINO to provide the TTL signal. I haven't sourced the ...
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1answer
36 views

CC driver led project

I have a lot of (new) LED light strips from a job I was on. These light strips were in 2x4 fixtures. As a project I would like to use these as undercabinet lights. But the CC driver that comes with ...
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118 views

Driving a WS2815 12V LED strip with a CC+CV driver

I am selecting a driver/PSU to power a string of WS2815 12V LEDs. WS2815 datasheet here: http://www.world-semi.com/DownLoadFile/138 One option I am looking at to power these strips is the Mean ...
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1answer
112 views

Parallel connected LED and current problem

First of all, I don't have much electronic knowledge. I am having trouble connecting the LEDs in parallel.I have two types of LEDs which have different power.Here are some current measurements: The ...
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1answer
64 views

Driving constant current LEDs with constant voltage?

I have about 6 pieces of bar leds in different colors (all of them are 12V, but different power 18W, 12W, 9W ...) I need to connect them in parallel by regulating 24V, but the problem is that the LED ...
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1answer
59 views

Proper Way to PWM (Voltage Control) Dim LED Strip

I have been asked to create a dimming system (Along with other features) that interfaces to the cheap LED strip lights. A lot of people seem to use standard N-FETs with PWM on the low side. My concern ...
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2answers
57 views

PWM driving of high-power LED with an arduino and regulation problem

I need to drive 2 red and 2 blue high-power LEDs for an application (LED indicated below). First of all, I connected the LEDs directly to the 12V power supply and measured the currents they draw. As ...
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1answer
58 views

Current source for high current LED driver- 24Vdc/max:16A

I am working on designing a current source for a LED driver, which can work up to max:16A, as long as stays On less than 500msec. Actually, the leds circutry is a Dome-light which is divided in 4 ...
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4answers
154 views

Driving LED with an N-Channel MOSFET

I am driving a red LED with a forward voltage of approx. 2V as shown in the picture. The driving signal comes from a microcontroller with a logic HIGH of 1.8V. The LED is being sourced from an ...
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1answer
18 views

PCA9956A How to set AIF bit

I am using the https://www.nxp.com/docs/en/data-sheet/PCA9956A.pdf chip to control LEDs. To set the autoincrement mode three beets are needed, But the AIF bit is ...