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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11 views

How to use YX8122 led driver?

I am building a small LED lamp from a jar(about 100ml), so all components should fit in it. I decided to use a LED drive/Joule Thief, that I found at online Chinese store. Datasheets (all I can find ...
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49 views

PAM2804 Lithium-ion single cell LED driver fails

UPDATE (2021-Jan-16) - All working as expected - Project link for anyone to build or do as they please. PAM2804, I've been trying to use this chip for a single Li-ion cell flashlight project, but it ...
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44 views

PWM signal with NMOS to adjust LED Driver

I have to design an LED driver for work. I am using the IS31LT3360 as the driver chip. On page 10 of its datasheet it states the chip can be driven with pwm. I came up with the following circuit. I ...
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33 views

How to select a CC replacement led driver?

I have a led ramp in my bathroom. It's dead. The led driver isn't providing any volts on it's output side. The previous driver was an EBIR AED06-700IIP44 but I can't find a new one. It's a constant ...
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53 views

Replace batteries with adapter for Christmas LEDs

This is related to a previous question. A box including 3 D batteries in a series configuration (4.5 V) is the power source of my set of Christmas LEDs. For these LEDs, I would like to design an ...
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42 views

Issue converting halogen desk lamp to LED

I have a halogen desk lamp with a three position rocker switch with a central off position and either side representing a different dimming setting. It has a transformer with two coils connected to ...
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63 views

Christmas LED lights connections

I have several Christmas lights with different AC adapters. First case In the label of one of them, I read: Primary: 220-240 V ~ 50/60 Hz Secondary: 31 V DC 3.6 W ...
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72 views

Flicker-free brightness control of RGB LEDs

I would like to individually control the brightness and colour of 100 RGB LEDs. I would like to do this with a fairly smooth current through each LED. I.E. I would not like to use the traditional PWM ...
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Dimming LED powered with an AC driver from a MCU

I want to power an LED (Forward Voltage: 30-35V, Forward Current: 50W:1750mA) with an AC driver (link), the title says "Dimmable", so my first question is regarding drivers, all of them will ...
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46 views

Boost regulator

How can I boost 11.1V from a LiPo battery to 24V input to an LED driver? My LED driver supplies about 20V at 1400 mA.
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Is my LED driver fundamentally incorrect, or can I compensate it somehow?

I'm driving 3 tricolor LEDs from 3 PWM pins. They can't source enough current to drive them directly so I have them switching on some 2n7000s. Works great when each PWM corresponds to one color but... ...
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Powering 12V 35W halogen bulbs with a constant current supply

I'm revisiting an old project, and I want to see if there is anything I could have done differently, or if I missed any important details or considerations. Basically, I used a constant current driver ...
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Need understanding of a LED/Lamp question

I have recently received a problem statement and need help understanding it. Problem Statement Proposed hardware must be able to support 10 White LEDs such that it provides a minimum of 450 “warm” ...
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38 views

Does Neopixel require a continuous signal to keep the LEDs lit?

I want to use Neopixels in a project which lights up some Neopixels, does a lot of computation and then changes some other Neopixels. Now since the program is synchronous I do not want to lose the ...
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84 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 LM2596HVS (max supply voltage: 63V) and it is connected to a Cree high power LED. The regulator is part of a off-the-shelf buck converter. It makes silly noise when circuit is closed ...
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53 views

Understanding AFE4403 datasheet

The datasheet is very long and I found it hard to grasp the essential information about the AFE4403 (https://www.ti.com/product/AFE4403). From what I see, it has the following main components: ...
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63 views

How to read datasheets effectively to connect components safely?

I understand that many questions have been posted regarding datasheets, but I hope that you can help me with my question as well. If I want to know how many infrared LEDs (SFH 4780S) can be driven at ...
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24 views

TPS63060 enable pin driver

because I want to have PWM dimming LED, I have connected PWM signal to EN pin of TPS63060. I wonder is this correct? According to datasheet chip have soft-start so it shouldn't destroy LED. PWM signal ...
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46 views

How a rgb led panel ( 16x32) works?

I'm currently working on a rgb led panel ( 16x32 1/4 scan rate ) ( driving with stm32f0) But i couldnt really understand what do i need to do to light up a specific led. When i apply one clock to R1 ...
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60 views

Are my calculations for this LED boost driver circuit correct? (TPS61169)

I have a display with the backlight LEDs arranged 6S4P (so 4 parallel strings of 6 LEDs joined internally, so must be driven as single string) and have been trying to find a suitable driver for it - I ...
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44 views

How to strobe high power led while maintaining constant current

I am trying to make a high power tv-be-gone. For those who don't know, it uses arduino or attiny to run through every IR power code for most tv brands. I have made regular ones that use several 5mm IR ...
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91 views

Driving 100W COB From mains using discrete components I have on hand

I was wondering if I could realistically drive a 100w COB directly from mains using a bunch of discrete components that I already have on hand. I have a bunch of BJTs MOSFETs and E cores and I want to ...
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40 views

Achieving long term stability of a MOSFET current sink

I've got 176 infrared LEDs embedded in CNY70 optical reflectance sensors, which I would like to power, and I'd like to ensure that the current supplied to any given LED is +/-1% stable (or better) ...
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74 views

How to convert R,G,B,W signal to 1 wire in LED strips

I found this RGBW controller which I really like aesthetically , the only problem is that this only works for LED strips that are 12V with separate R, G, B, W, data lines and the strips I have are the ...
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4answers
77 views

LED Light panels - Selecting the right driver for less flicker [closed]

I'm in the process of helping a friend who is a photographer. She has been using LED lights (OLD) with no issues. She recently bought new lights (NEW), but noticed much more flicker, making it ...
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3answers
626 views

Matching number of LEDs to power supply

I have an LED power supply - constant current with output 1.4A/96W/23-69VDC. I want to buy a number of LEDs and connect these in series. What do I need to calculate to know how many of the following ...
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2answers
65 views

Constant current LED driver using transistors

I have this circuit: I understood the operation: On power-up Q1 and Q2 are off. There is no collector current so L1 is off. If the digital control input on the left is brought high (5 V) Q1 will ...
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86 views

Op amp controlled LED current

I'm trying to implement a simple current control circuit for an LED from here: https://www.allaboutcircuits.com/technical-articles/the-basics-behind-constant-current-led-drive-circuitry/ The ...
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Removing one strip of LEDs from panel

My LED panel broke (it is a ceiling lamp). I disassembled it, and it looks like this: It has a series of LED strips (the last one is missing in the image), connected in series. There are connectors ...
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1answer
61 views

Power LED constant current driver unstability

I have a task to design a driver to drive 3W power LED. I have only 4 wires to dim 7 LEDs individually, so I decided to use WS2811 "magic" driver for PWM. The rest of the circuit is to ...
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38 views

Can I power multiple Constant Current LED fixtures with a Single Constant Voltage Driver?

I would like to repurpose eight, 8' LED strip lights that were previously individually powered by 1600ma constant current drivers. Is it possibble to power these LED fixtures with a more readily ...
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i2c over 1m shielded multi-core cable with 0.5A load at the same cable is possible?

I'm using an I2c sensor (Time of flight, VL6180X breakout board with voltage regulator onboard) at the end of a 1M cable. An arduino controls it. As I2c was not meant to be far away from the PCB and ...
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48 views

Understanding LED chain systems

There are several LED light chain systems on the market, like the Konstsmide 31V system or various traders' "System Decor" or "System 24". All seem rather similar, but there are no ...
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How are pin mapping done in LCD driver / microcontroller

I'm getting a custom LCD made, and it is a non COG version (to save on tooling costs), which means I'll need to use an external LCD controller. My LCD has 128 segments, so 32+4COM pins would suffice. ...
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Choosing an appropriate constant current LED driver

I am trying to replace a (suspected) constant current LED driver in a plant lamp as it has a terrible plastics smell. I am searching for a more high quality driver. I do not know then forward voltage ...
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36 views

LED Controller Circuit Design with BJT

https://www.circuitlab.com/circuit/mthven79a2m6/led-controller/ I designed a LED controller to turn the led on/off. What do u think about my design?
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109 views

Turning led strip on with car battery power

I'm trying to find a good and cheap way to turn on some led strips with car battery without burning or stressing the leds. I've found out it can be done with a resistor but it's not the best way to do ...
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71 views

Problem controlling common cathode 12V RGB LED

I want to be able to control an RGB LED with common cathode and I've used the circuit below for each colour. For some reason there is 12V on the output all the time and I can't control the LED as it's ...
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Step-down as LED driver leads to flickering

I received a LED driver board that uses an A6902D step-down as regulator. Here the schematic of the driver section: PWM_3 is the signal from the MCU: 500 Hz (tried ...
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1answer
34 views

LED Driver IC off a single-cell Li-ion battery (Too large of a voltage difference?)

So I'm an idiot and I need help interpreting a basic datasheet. This is for a Boost-mode LED Backlight Driver IC. https://media.digikey.com/pdf/Data%20Sheets/Diodes%20PDFs/AP3031.pdf I need to drive ...
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LED spot circuit sanity check

I, an inexperienced but curious and willing person, would like to have 4 LED spots managed together by 1 driver and a smart dimmer, but I would like to check if my plan is sound before turning $100+€ ...
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2answers
56 views

Meanwell Led driver: internal 3-in-1 dimming circuit

In Meanwell led drivers like the ones from the XLM, HLG or LCM families, how does the internal circuitry for the 3-in-1 dimming feature (0-10V, 10V PWM, 0-100kOhm) look like? I use a LCM-25 in my ...
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83 views

Is it possible to pulse on a LED strip as the warp engines do on Star Trek TNG? [closed]

I'm trying to activate a LED strip in the same manner and sequence as that of how the activation of the warp engines on the Enterprise in Star Trek TNG. When activated the following happens- LED ...
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1answer
46 views

TLC5955 Combining 48 outputs to 3 | PCB

Can I combine the TLC5955 outputs in this way to connect one 350mA RGB LED? I calculated that 6 mil at 1 oz Cu would be enough for 32 mA. What thickness of PCB should I choose for heat removal from ...
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68 views

350 mA RGB LED driver IC

I need an inexpensive RGB LED driver IC with minimal BOM that: ...
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1answer
65 views

Understanding Thermal Characteristics for Microchip CL2N3-G Constant Current LED Driver

I'm having trouble interpreting the thermal characteristics of the Microchip CL2N3-G Constant Current LED Driver chip. Here's the datasheet: CL2N3-G Constant Current LED Driver 1 What I want to do is ...
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19 views

Is there any CC Led Driver IC that has common GND between led cathode and VIN-?

I have a project that has as 3W (using 500mA) Led and an I2C sensor at the end of a cable, and I need 6 wires for it. (4 to the I2C sensor) and 2 for the led. I’m using the PT4115 CC led driver CI, ...
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70 views

Power LED without driver

I purchased a number of 50W 5B10C high power leds. Link at end. These need at least 25V to turn on and I am using a setup with a 21V LIPO battery and a 150W boost converter stepping this up to 30V. I ...
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36 views

LED driver as Power source

I am beginner in electronics, I have LED driver (12V 5A) can I use it as power source for DC motors,Small DIY projects,or as SMPS?
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124 views

High power (up to 400W) LED DC/DC power supply design considerations

I am designing a power supply for a high power COB LED requiring 360W @ ~75V from a variable ~60-80V DC input. I have noticed that it is difficult to find switching controller ICs that advertise being ...

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