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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24 views

Can someone help me design an expandeable led strip system

I want to make an open source expandable system to control WS2812B 5m 60 ip30 (or higher pixel density) led strips. Im going to be using about 40 meters which is about 2400 leds in total but all the ...
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128 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. ...
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52 views

Need help incorporating a PWM into a circuit

everyone I hope you're staying safe. To preface I am a noob at electronics, and I've learned a lot these past weeks. I need help designing with designing a circuit. To explain my project: I have a ...
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117 views

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

I am trying to test a LED lamp of 24V and 40W with the driver HLG-40H-24B (constant current, output 24V and 40W) but it does not work correctly: The LEDs flash regardless of the voltage value (from 1V ...
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Unexpected behavior setting non-default I2C address for HT16K33 LED Driver

The HT16K33 is an I2C controlled LED driver. The data sheet shows a standard way of setting the I2C slave address: I have implemented this circuit, but it does not work as expected. For the default ...
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220 views

How to select the best opamp for a constant current MOSFET driver

I'm trying to create a constant current LED driver. I have found and read information about the miller effect and came up with the schematic below. What are the most important parameters for choosing ...
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TPS92830-Q1: Unexpected LED Driver Gate Voltage [closed]

Schematic Link: https://a360.co/2XsIdVQ

 We are a small automotive electronics company trying to take advantage of the TPS92830-Q1 3-Channel High-Current Linear LED Controller. Our design drives ...
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Help with a constant voltage led driver

Maybe the title could be better chosen. Hello, I have a 33V 0.8A constant voltage led driver (see picture below, the item no. is GL-1201C-8 if that can help) which no longer works. I searched online ...
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38 views

What are the maximum number of RGB LEDs that can be hooked up to just one of these I2C RGB LED Drivers?

So this is LP5036 by TI (Datasheet), a 36 channel RGB LED driver I2C interface-able with a micro controller, which means it can drive upto 12 RGB LEDs individually up to my understanding. But using ...
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63 views

Series and parallel LED using

I am planning to build 4 LED-strips using two different 'white' settings (1+1 strip x 4). The LEDs will be driven by a 24V constant voltage dimmable RGB-DALI driver (up to 5A per channel). My idea is ...
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16 views

COB LEDs array in parallel driving circuit

I need to connect half a dozen COB LEDs (36V, 300mA). I can only connect them in parallel, not in series, because of wiring considerations. For them to all be at the same brightness, my understanding ...
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Library for driving P10 LED Display with ESP32

I am trying to make a 10 digit cricket scoreboard for which, I want to use P10 LED modules as digits. My objective is to change the score from Mobile Phone via BLE. ESP32 microcontroller suits best ...
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LED panel wiring

I have matched an led driver (constant current power supply) to a circuit of leds such that no resistors are needed to limit the current by taking advantage of the leds "near" linear voltage ...
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807 views

Using MOSFET with Open Drain Controller

I'm using a PWM IC to control some LEDs, and it uses an Open Drain setup. So I run 5V to the LED (through the appropriate resistor) then connect the LED ground to the PWM terminal. I have one led ...
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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 ...
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234 views

specs for LED driver to power 18 x XML T6

I'm building a flashlight comprised of 18 x XML-T6 LEDs. The battery bank can be configured as 2 or 4 x 26650 batteries 7.4 or 14.8 volts input. What kind of driver could power these 18 x T6 in terms ...
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PT4115 LED driver

Excuse me if my question is too specific. I'm trying to get an LED driver using PT4115 work. I've spent hours but no success. I've created exactly the circuit depicted in the datasheet. I have used 0....
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188 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 ...
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157 views

Multiplexed LED column driver MOSFET doesn't fully turn off without a resistor parallel to the LEDS

I have a board with a 16x10 led matrix. The columns are switched with DMG9933 Dual P mosfets. The rows are driven with a constant current led driver ST STP16CPC26 (similar to TI TLC5956) I noticed ...
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141 views

ISELED Driver Communication protocol

This is my ISELED Driver Datasheet INLC10AQ & my Microcontroller datasheet S32K142 - 64 pin Microcontroller I have a NXP Microcontroller connected to the above LED Driver. I need to figure of the ...
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71 views

Trying to design a switchable LED circuit with no experience or skill - please send help - PART 2: I set a transistor on fire, please send more help [closed]

following on from my previous question: Trying to design a switchable LED circuit with no experience or skill - please send help I have an update - a mix of good and bad news... Good news is the LEDs ...
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359 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 ...
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219 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 ...
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130 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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36 views

Fusing an In-Wall LED Application

I'm building my own PCB to power 8 in-wall LED's for a stairwell. I'd like to protect the LED's with fuses, but I'm unclear on how the voltage on fuses work. My specs are as follows: LEDs: 5V, ...
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167 views

Using TBD62083 to drive LED array from CPLD

I am looking for a cost effective way to drive 6 seven segment LEDs and 20 discrete LEDs from an Altera Max V CPLD. The CPLD has I/O voltage of 3.3V and 4mA drive and the Common Anode seven Segment ...
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77 views

Creating stable 72V power source

For a lighting project, I want to power 12 programmable LEDS (WS2812b or equivalent) in series, and then have 5 of these sets in parallel. Due to extra resistance, I think I need a constant voltage ...
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103 views

How to drive the gate of a MOSFET with a PWM like signal

I'M trying to use MOSFET as a driver for my 10W LED with 12V supply. This LED will be used as a transmitter with signal coming from Arduino nano. I'm using IRFZ44N MOSFET with a Vgs(min)=2V and Vgs(...
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34 views

Want to understand the led series/parallel and parallel/Series combination circuit

I'm Working on LED load design circuit which is up-to 64V@1.2A. I thought of giving LED's in series and parallel combination with switches to control the voltage but while searching I found one ...
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2k views

How can I use an LED driver (QX5252) to light up 3 different color LEDs (Green, Yellow, Purple)?

I am trying to light up 6 LEDs with the common garden light circuit (2v Solar panel and 1.2V battery). The problem is that I want to light up 2 yellow LEDs, 2 green LEDs, and 2 purple LEDs ...
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33 views

Drive series of 1W led with mosfet

I've to switch on for a short time a series of 6 or 7 leds with a 24Vdc. Follow some details... power supply: 24VDC led: 1W CREE XRE Q5 link Power: 1W Voltage: 3-3.7V Current: 300-500mA this small ...
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68 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 ...
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182 views

Minimalistic LT3080-1 current source

I am trying to design a minimalistic current source to drive an LED from a lithium polymer battery and with a small number of components to minimize board space usage. First I wanted to use the same ...
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29 views

Am I calculating my shunt FET power dissipation correctly?

simulate this circuit – Schematic created using CircuitLab I'm designing an LED driver circuit that requires very fast PWM switching at a high resolution (10bit at 30khz requiring a minimum ...
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35 views

TI TPS6116 Output Voltage

I am designing an LED backlight driver as a sub-circuit for a DPI interface. The backlight in question requires 12.8V. I am trying to use the TPS61161 and have read through all of the documentation ...
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22 views

LED driver - current monitoring AC or DC side with Arduino

I have 2 LED strips connected in parallel to the same LED driver (driver is constant current + constant voltage). I have got an Arduino controlling a relay module that switches the lights on or off (...
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374 views

DALI DAPC OFF command

We are working on DALI LED control gear type product. We are using TPS92515 as LED driver and its controlled through Iadj pin (analog dimming). Our issue is even if we give input zero (GND) to control ...
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139 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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33 views

Powering and dimming white LED from single-cell 3.7 rechargeable lithium battery (with a 3.3V Arduino mini)

I'm designing a circuit for a handheld project that runs from a 1-cell rechargeable Lithium battery (18650 or prismatic). The circuit powers an Arduino Mini Pro running at 3.3VDC. The Arduino board ...
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25 views

The number of led lights on a transformer

I want to know how many led 20mA 3V lamps can I run on a 15 volt transformer. I want to have each one controlled separately - in other words I might have only one on or I might have all of the on or ...
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LED driver circuit : MP2480

I am trying to drive an XHP70 (single LED) board - XHP70A-0S-01-0D0HM227G using a power supply. I need a functionality to dim the system. I was planning to use a driver board - Monolithic LED driver ...
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75 views

Can the voltage drop of an LED driven at a constant current be higher than the supply voltage?

So I've been working on a constant current LED driver project, and I've run into a weird situation. I'm driving 3 parallel rows of 8 LEDs in series (Luxeon 2835 color, green) using a Sparkfun picobuck ...
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57 views

Noise when using SPI LED driver on 2m cable?

I've made a 2 letter 7 segment display using this LED driver https://www.st.com/en/power-management/stp16cp05.html when I connect it with a 10-20 cm cable to my MCU board it all works OK, but fails ...
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74 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 ...
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53 views

LM317 adjustable constant current source - Why is the voltage between Output and Adj pins is not always 1.25V?

I am trying to create an adjustable constant current circuit using LM317 to drive LEDs of different colors. More specifically, I want the brightness of the LEDs to be the same, therefore, the ...
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274 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-...
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549 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 ...
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612 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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102 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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168 views

Multiplexing high current connections?

Noob question here. Currently I'm using a darlington transistor array to drive about 14 IR leds. I want to be use a CD74HC4067 multiplexer to simplify and shrink things up a bit. The IR led's I'm ...

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