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

Filter by
Sorted by
Tagged with
2 votes
2 answers
185 views

Can any connector be used for LED strips

In my project I use 10m of 24v LED strips. I am looking to get connectors to connect power to wireless module and from the wireless module to the strips. I see they mark connectors as 12v but ...
  • 29
1 vote
1 answer
57 views

Using skin to close low-voltage circuit

I am trying to create a ping pong ball sized light-up ball that should light up when held in my hand, as in the 80's toy inspired by the movie/television series "Star man". The circuit must ...
  • 11
1 vote
0 answers
80 views

Most efficient and cheapest way to drive a high power and consumption giant dimming LED matrix

I'm building a giant LED matrix for an art project. Each "pixel" is a 12V RGB LED strip consuming ~23W, and has to be fully dimming controllable. We're talking about 768 pixels with a total ...
1 vote
0 answers
51 views

Driver for a CW laser diode

I have a 20mW CW laser diode that I want to control with a microcontroller. I found that it has to be powered by a constant current circuit so that the power of the laser never changes. I have been ...
2 votes
2 answers
65 views

Changing a store-bought LED power supply's output

I bought a flat panel LED light including a LED driver. I want to permanently dim the light a bit, without having to buy their expensive variable dimmer. I tried to make a diagram of this power supply....
  • 21
0 votes
0 answers
34 views

How can I drive a 19V/25W LED strip with an Arduino and high-frequency PWM?

I just made two LED panels each consisting of two colors of LED strips. They are wired in a way that allows it to be powered from a 19V (3.42A) laptop power supply: (This image shows only one panel.) ...
  • 1
0 votes
0 answers
35 views

Power LED strip using controller

I'm new to powering LED strips (and even electronics itself) and I was looking for a way to power the strip and controller using a single power supply. I'm going to buy a 3m 60 LED/m on Aliexpress, ...
-4 votes
0 answers
59 views

Rare mid frequency flickering detected [closed]

Does anybody have a suggestion for a driver that does not produce that rare flickering, the kind that apparently only 1 in 4000 people can detect? Our client is currently using a WAC driver and WAC ...
  • 1
0 votes
0 answers
102 views

Oscilloscope probe affects operation of the circuit

I'm working on an LED driver for a fairly powerful LED array. I'm using one of TI's chips, the TPS92691. I'll start by providing the schematic: The array can sink up to 10 A. I'm using both analog ...
0 votes
3 answers
129 views

LED breathing circuit [closed]

I'm trying to build a circuit which will involve 20 LEDs and run from a 8.4 - 7.2 V Li-po battery. I have assembled this circuit on a breadboard and it works great. I have also spent many days ...
1 vote
0 answers
23 views

What are typical "crest factor" values for significantly non-linear typical household loads?

What are typical "crest factor" values for significantly non-linear typical household loads? By household loads, I mean anything either plugged in to a receptacle or hard-wired like ceiling ...
0 votes
0 answers
47 views

Garland control circuit broke down

The garland is 220 V and consists of two series of 96 LEDs each. The LEDs are warm white, medium brightness, the current is unknown, perhaps about 20 mA. It will be enough to have a circuit without a ...
  • 33
0 votes
1 answer
72 views

Is harmonic distortion only a problem for the power company?

I know that harmonic distortion is a problem for the power company because it influences the power factor, but what about me as an end user? In my situation I would use 9 drivers of 200W (230VAC/48VDC)...
  • 119
2 votes
0 answers
85 views

New driver/controller for Christmas tree LEDs

I have a 600-LED Christmas tree. The controller went kaputt. The tree consists of three sections with two groups of lights in each section. The LEDs themselves are a two-lead type RGB and have two ...
0 votes
0 answers
34 views

LED bulb driver

I am trying to make a non-isolated LED bulb driver and while reverse engineering I found the driver's inductor has three pins: one is connected to ground, one is connected to the FB pin of the driver ...
3 votes
0 answers
89 views

Ultra-fast driver circuit for low-power LED

The goal is to drive a low power LED at a very high frequency, with pulses of ~10-100ns width in order to produce a very narrow burst of light. The pulses do not need to be closely packed together, ...
  • 31
1 vote
1 answer
60 views

LM317 adjustable current regulator for LED

I am driving a 10 W LED from a LM317 regulator. With a variable resistor in between the OUT and ADJ pins of the LM317, I can easily get an adjustable current source (20-350 mA). However, I need to ...
  • 337
2 votes
0 answers
53 views

Can anyone identify/point me to documentation for a 6-pin SMD device marked as (W?)T2105

I'm troubleshooting an LED workshop light that is malfunctioning and am reverse engineering a schematic to get a better sense of what may be the culprit device. The best I can discern from viewing a ...
  • 21
0 votes
0 answers
40 views

Constant voltage LED driver to constant current conversion

I have 12 pieces of wrong supplied Meanwell LPV-35-24 LED drivers which are of constant voltage type onboard a vessel. Our lighting fixtures are using constant current drivers and I run out of spares. ...
user avatar
0 votes
2 answers
151 views

Low Rds MOSFET is heating a lot when powering a 3 W LED. How can I modify my circuit to correct it?

I'm using a PT4115 LED driver to power a 3 W LED (700 mA) over a 1 meter cable. I've already had help here to use the same VIN for the LED driver and LED+ pin to power an MCU on the end of the cable, ...
  • 445
0 votes
2 answers
63 views

How to connect 4-pin LED cable to the 4-pin power supply without soldering?

How can I connect a 4-pin LED extension cable to the 4-pin power source without soldering? What type of connecter can be used here? (the following two cables should be connected) I think it's not ...
  • 101
0 votes
1 answer
53 views

Can I merge the output negative of multiple LED drivers?

I have a LED COB with 6 strips, 8 A DC constant each, fed by 6 LED drivers (Meanwell HLG320H). They will be driven by the same 1-10 V dimming current. Can I merge (put into contact) all 6 negative (-) ...
  • 163
0 votes
1 answer
81 views

Achieve the same intensity with many LEDs

I want to ask question about intensity control of parallel LEDs. How can I achieve the same intensity for all LEDs? Here follows some details. What I want to achieve is to light up 10 (or more) ...
  • 11
0 votes
1 answer
61 views

Can I use the VIN line of a switching LED driver after its sense resistor for powering an MCU?

I have a circuit where I use a PT4115 LED driver for lighting a 3W LED at 500mA. The datasheet for the PT4115 LED driver is here. The normal configuration for the PT4115 driving an LED is below: I ...
  • 445
0 votes
1 answer
30 views

Can a VCC line of a 3W led being PWM'd on the CAT4101 LED Driver be used to power other circuits?

I'm designing a circuit where I'll run a 3W LED using the CAT4101 Led driver, like in the in picture below. VCC will be a 2s Li-Ion battery, at 8.4 - 7.2V DC. As I'll use PWM to DIM the led, there'll ...
  • 445
1 vote
1 answer
127 views

Control high-power LED by LT3080 and PWM

I am a beginner in electronic circuits, so could someone check if my circuits design is correct? What I want to achieve is as follows; Light up 5 high-power LEDs (EDC780D-1100) Vf = 2.1 V If = 800 ...
  • 11
0 votes
1 answer
74 views

Adjusting the output current using a microcontroller

I have an LED driver. The current limit is set by the resistor RIADJ. Now there is 3.24 kΩ, which is equal to the current ~ 1 A. Also, the current can be adjusted by supplying an external current ...
5 votes
2 answers
204 views

Importance of MOSFET timing vs R-DS(ON) in LED driver performance

I am designing a commercial LED driver to replace one which is no longer available, and because of supply chain issues I'm trying to select "maximally available/maximally substitutable" ...
  • 8,183
1 vote
1 answer
27 views

Maximum number of LEDs in series for AP5724 LED driver

For a small project, I would like to use 8 LEDs in series. Each LED has a Vf of 3.3 V. My input voltage is 3.3 VDC. I plan to use the AP5724 LED driver. The datasheet has an example of a circuit using ...
0 votes
1 answer
170 views

Can I use a laptop charger to drive LEDs?

I tried googling about laptop adapters being used as LED drivers. I tried to to use it and it worked fine. Some articles says that laptop adapters are voltage-regulated and not constant-current ...
6 votes
1 answer
190 views

Is the output of a 12V DC driver different depending on forward or reverse phase AC input?

Does the output of a 120 volt AC to 12 volt DC LED driver differ depending on whether it receives forward-phase AC input or reverse-phase AC input from a dimmer? I’m curious because I have some LED ...
0 votes
0 answers
58 views

How to fanout a GND

This is a drawing fragment of a unit that I have to extend a slave display from. simulate this circuit – Schematic created using CircuitLab Rough drawing of what I would like to add to expand ...
  • 692
-1 votes
2 answers
186 views

I2C with LED driver doesn't work

I have a circuit with a PCA9635 PWM LED driver. I want to turn on and off LEDs one after another, but my code does not work. I think the hardware is OK. My micro is a 16F887. Can you help me? ...
  • 1
0 votes
2 answers
78 views

Preventing power LED runaway with voltage and PWM [closed]

Using near-minimum voltage for the LEDs to light up, and PWM to control brightness by not allowing the frequency/brightness to go above a certain point. Comments are telling me its not okay to not to ...
2 votes
2 answers
188 views

Driving different number of LEDs in series with a constant current driver

After two days of searching, I'm a bit lost when trying to design an LED with a constant current driver IC. In my circuit, I have LED indicators I want to control independently and an LED backlight ...
  • 35
3 votes
1 answer
103 views

Workings of single constant-current source with four MOSFET-switched LEDs

Background I have several hundred RGB+White LED lights which are controlled by a driver circuit which is no longer manufactured, and trying to plan some maintenance and possible replacement of the ...
  • 8,183
1 vote
1 answer
168 views

Sanity checking an LM2596-ADJ constant current supply design for driving LEDs

I've designed, in simulation, an adjustable constant-current supply based on an LM2596-ADJ buck converter IC. I chose STW8B12C LEDs for simulation because three of them in series roughly matches up ...
  • 8,707
0 votes
1 answer
61 views

COB LED unwanted blinking

I'm testing a Cree CXB1304 powered by a constant current driver Meanwell LPV-35-36 This setup makes the LED blink regularly every 2 secs, as I've read this occurs when the driver has insufficient ...
  • 1
0 votes
0 answers
132 views

LED driver circuit works only when I touch it with my finger

I'm trying to convert an E14 RGB LED bulb to be able to power it from a lithium battery. Inside the bulb are 2 PCBs - a transformer and a LED driver - which are connected by 3 wires. Black and red are ...
  • 11
1 vote
1 answer
69 views

How to set outputs on a Toshiba TC62D722CFNG shift register LED driver IC

I want to use the TC62D722CFNG shift-register LED driver IC to toggle some LEDs, however, I am having trouble getting the outputs to turn on at all. The IC is capable of controlling the LED current ...
  • 331
3 votes
3 answers
98 views

Using long button presses to vary duty cycle of 555 (instead of potentiometer)

Apologies for poor phrasing and structure, this is my first post. I am trying to learn how to implement 555 to create a PWM with variable duty cycle (for control of LED brightness) Rather than the ...
3 votes
3 answers
228 views

Best way to power a single LED from a battery

I'm looking for a good way to power a single LED with a coin battery (CR2032). Here are some of the requirements/characteristics of the system I'm trying to add this LED to: I don't need full ...
  • 185
0 votes
0 answers
55 views

How do I build an LED driver, where the input is a current source?

I'm designing a driver to interface four 7-segment digits (8V, 20 mA per segment) with an AS1115 driver (5V supply, constant current outputs). Following an internet source, I have the circuit shown ...
2 votes
2 answers
154 views

Powering long LED strip, injecting power. Correct way to fuse?

Recently I asked an opinion based question regarding LED strips. I have learned my lesson and now I have an actual question regarding "how power flows". I'll explain: I have a lighting ...
1 vote
1 answer
48 views

How to choose suitable LED power supply

Can I replace an LED power supply with this output: DC 50~57 V, 280~300 mA with a new supply with this output: DC 45~85 V, 300 mA ±5% ? In other words, does it matter that the output voltage has a ...
  • 113
1 vote
0 answers
59 views

High Bay LED light rebuild

I've got a 200 W High Bay LED light from a friend. Its circuitry is blown up; it was connected to 380 V instead of 220 V, but it also had flickering issues before that. I would like to build it a ...
2 votes
1 answer
69 views

Can I use an external MOSFET to dim this high-power LED driver?

I want to use the PAM2861 LED driver. It can handle my intended load (1 A and two LEDs around 3 V per channel) and I know this because someone with a similar project used it. It's also available at ...
0 votes
3 answers
89 views

Picking the right boost/buck converter to power LEDs from 12 V battery

I'm looking to run four 3 W high-intensity LEDs in a series circuit using a 12 V battery, for an outdoor lighting setup. My intention was to use an adjustable buck/boost converter, as I've used to run ...
0 votes
0 answers
43 views

LED strip multi segmented WS28xx wire gauge

Given the following "circuit", I'm trying to find out what the correct wires gauge should be for the points: A,B and C. I have 15 LED strips (WS2815, DC 12V / 60 LEDs per meter). Each ...
  • 343
0 votes
3 answers
98 views

How can I use a 5 V LED driver with an 8 V display?

I'm using a Raspberry Pi Pico to make an enormous countdown timer. The LED driver will be the AMS AS1115 and the digits are Kingbright SC40-19SYKWA. My problem is that the digits want 8 V but the ...

1
2 3 4 5
16