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
229 views

Drive a series of 1 W LEDs with a MOSFET

I have to switch on for a short time a series of 6 or 7 LEDs with 24 VDV. Some details: Power supply: 24 VDC LED: 1W CREE XRE Q5 link Power: 1 W Voltage: 3-3.7 V Current: 300-500 mA This small ...
0 votes
2 answers
74 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 ...
1 vote
1 answer
223 views

Testing a 24 V, 40 W LED lamp with constant-current LED driver

I am testing a 24 V, 40 W LED lamp with the driver HLG-40H-24B (constant current, output 24 V and 40 W) but it does not work correctly: the LEDs flash regardless of the voltage value (from 1 V to 10 V)...
2 votes
2 answers
144 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 ...
3 votes
2 answers
515 views

Driver selection for high power LEDs

I'm currently working in a project where I need to control the intensity of 24 high power LEDs in 5 levels. I'm planning to use LumiLeds L1CU-BLU1000000000 (https://www.lumileds.com/uploads/705/PB198-...
2 votes
1 answer
67 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 ...
0 votes
0 answers
70 views

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 ...
1 vote
1 answer
96 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 ...
1 vote
1 answer
739 views

Dimming multiple LED panels without PWM to LEDs; modified DMX control or something else?

In driving a single LED from a 9V battery, for example, you put an appropriate resistor in series with the LED, and the current is reduced. Vary the resistor, and the light intensity from the LED ...
1 vote
4 answers
2k views

Why do LEDs require a constant current source and not a constant voltage source as power supplies?

Most electronic devices use constant voltage source as power supplies. Why do LEDs require constant current source?
4 votes
4 answers
7k views

Driving LED with an N-channel MOSFET

I am driving a red LED with a forward voltage of approx. 2 V as shown in the picture. The driving signal comes from a microcontroller with a logic HIGH of 1.8 V. The LED is being sourced from an ...
0 votes
1 answer
40 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 ...
0 votes
0 answers
101 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 ...
1 vote
2 answers
387 views

What is the best LED driver to use for this setup - Help with WS2815 data amp over long lines

Currently have 5 m WS2815 strips installed running from 18 AWG wiring connected to 12 VDC Meanwell power supplies and our controllers (SP108,SP102,SP608), power injection on all lines. When we tested ...
3 votes
3 answers
264 views

Setting current on Diodes Inc PAM2863 LED driver IC, with external resistor AND driving different voltage to VSET

I'm looking to use the Diodes Inc PAM2863 DC-DC LED driver in a project. The datasheet gives a V=IR method for setting the average output current with an external resistor, where Iout = 0.1 / Rs. ...
4 votes
1 answer
430 views

36x LED 5730 in series: diodes burnt when LED driver (based on BP9833A or MT7854BD) powered up

Background: I have 18W, 36 LED lamp fixture which I cannot change. Originally it has 2x parallel 18off 5730 LEDs and 300mA driver. It works for some time, but diodes starts burning. I thought that ...
1 vote
1 answer
37 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 ...
3 votes
3 answers
76 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
156 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 ...
0 votes
2 answers
304 views

"Amplify" LED-Controller to handle higher currents

I have a bunch of LED controllers which I am currently controlling over WiFi. Unfortunately, they are all rated for very small currents of about 2 Amp (ish). Each LED Color gets driven with a simple ...
1 vote
2 answers
163 views

Why does voltage regulator heat up and starts to switch the supply when it is used for driving a high-power LED?

The regulator is an LM2596HVS (max. supply voltage: 63 V) and it is connected to a Cree high-power LED. The regulator is part of an off-the-shelf buck converter. It makes silly noises when the circuit ...
1 vote
2 answers
212 views

How could I build an amplifier circuit that can take an input voltage of 0-0.7V and amplify to 0-32V, 1 ampere, that works for 100 MHz?

A little background first. I am trying to build a pretty dumb project where I try to take a VGA input and display it in a manner similar to a Nipkow disk. The high frequency RGB signals need to be ...
2 votes
2 answers
67 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 ...
0 votes
0 answers
44 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 ...
1 vote
1 answer
44 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 ...
1 vote
0 answers
52 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 ...
1 vote
4 answers
296 views

12V LED radial wiring

How do I install the 12V equivalent of a radial/lighting circuit? I am about to renovate a small 40m2 apartment. I do not want to touch the existing 240VAC cabling at all. I am looking to have ...
2 votes
1 answer
59 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
58 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
3 answers
88 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 ...
0 votes
0 answers
27 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 ...
4 votes
1 answer
3k views

LED-driver board with WS2818/WS2811 and PT4115

I want to develop a board with a WS2818 IC and three PT4115 as high current LED drivers. Input voltage shall be 12-18V. You can easily mount a Wemos D1 Mini ESP8266 board on the top edge, as the pins ...
4 votes
3 answers
789 views

Is a current mirror necessary if LEDs are binned?

I have a 20VDC input with a buck CC LED driver, driving 48 LED strings of 6 x 3V LEDs in series. I am underdriving the LEDs at 60% of rated power. Each LED string consumes ~33mA. The LEDs are ...
0 votes
1 answer
35 views

How do I search for multi-output relay/driver chip for negative voltages?

I have a strip of RGB LEDs. If I attach a multimeter between the common pins and another pin like the red power, I measure -2.4V . I think this is what is described as common anode. I have an L293D ...
0 votes
0 answers
29 views

Are my calculations correct? 5050 LED strip 96 LEDs/m and Gledopto thin controller

So I bought Gledopto mini LED controller 5in1 and now I want to buy compatible strip. I bought a 5050 LED strip: 5 meters with 96 LED per meter. From what I found power consumption per LED is 0.24 W ...
0 votes
0 answers
72 views

0-10V LED driver dimming with Raspberry Pi and FET

I'm a beginner, so please be gentle! I'm trying to dim the linked LED light fixture driver using a Raspberry Pi (RPi). I want to dim using PWM in conjunction with a FET. Before dimming I am trying to ...
2 votes
2 answers
58 views

Derive voltage of LED array?

I'm trying to diagnose a faulty builder's worklight. It has a single board, a 8.4V battery, an external 8.4V DC input, and a LED Panel. What voltage would you expect at the LED panel? I'm measuring 8....
6 votes
1 answer
376 views

Where can I find the datasheet for this LED driver IC?

This IC (in the middle of the board, has seven terminals) is from a LED driver circuit: And here is a closer look: It has the text "9504DB 6C70Y" on it. I need help finding its datasheet. ...
0 votes
0 answers
45 views

RGB matrix connection to IS31FL3731 LED driver

Can anyone help me connect RGB LEDs to an IS31FL3731 LED driver from ISSI? I can not wrap my head around how to make the connection. According to the datasheet, figure 8, it should be connected like ...
0 votes
1 answer
316 views

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 ...
0 votes
1 answer
65 views

LED - Downlights/Recessed Lights - Quality, Safety [closed]

I been looking to upgrade old recessed can lights with "modern" LED slim potlights, Market is flooded with different brands. I went out and purchased a bunch of LED lights, removed the ...
1 vote
1 answer
61 views

LED8102S Driver Circuit

I have what I thought was a pretty simple low-side LED driver circuit based on the STLED8102S IC. The supply voltage to the circuit is 12VAC nominal (15VAC measured), rectified & smoothed to ...
11 votes
3 answers
2k views

Why did my LED drivers blow up?

I recently designed my first PCB, which houses LED driver circuitry for some custom lighting. I fastidiously followed the driver's datasheet (Diodes Inc AL8862QSP-13) in designing the circuit: making ...
2 votes
1 answer
65 views

Trying to use opamp to buffer BuckPuck control input - but it keeps blowing up

I'm trying to make a fairly simple circuit, which powers a few LEDs in series using a single BuckPuck 3021 (https://www.ledsupply.com/content/pdf/led-driver-luxdrive-buckpuck_documentation.pdf) The ...
0 votes
0 answers
30 views

Trying to recreate calculation results from datasheet for ZXCS440 LED driver

I am trying to design an LED driver based on the Typical Applications Circuit of this ZXCS440 datasheet (page 13), but when applying the calculations shown on pages 6-8 I am struggling to find the ...
1 vote
3 answers
210 views

LED driver high current and voltage

For a project I have to design a led beacon that will consist of +400 LEDs. These LEDs will be driven only a short amount of time maximum of 3% duty cycle (frequency: 100Hz, pulse: 300us). The LEDs ...
0 votes
3 answers
316 views

Two types of LEDs, serial - parallel combination

I am trying to design small DIY grow light for Chilli Peppers. I found ideal to use a combination of Samsung LM301H(https://www.samsung.com/led/lighting/mid-power-leds/3030-leds/lm301h/) and LM351H V2 ...
1 vote
1 answer
555 views

How to connect LED driver to arduino

How do I connect 2 of these LED drivers to Arduino? http://www.starchips.com.tw/pdf/datasheet/SCT2024V01_03.pdf This is what I have so far, im connecting each output to a N-channel mosfet. Im not ...
1 vote
2 answers
358 views

Buckpuck control with digipot

I'm working with a circuit that should control the intensity of several LEDs using the CTL and REF pins on a buckpuck driver part number 3021-D-E-1000. I'm using an AD5204 digipot configured as a ...
0 votes
1 answer
77 views

Using USB-C PD 12V to power LED strip?

My Philips Hue light strip 30W / 12V power supply died, and I'm looking to replace it. The OEM replacement is big and heavy; meanwhile there are GaN-based USB-C wall plugs, that can deliver 30W / 12V,...

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