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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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Square pulse of high frequency for Led flickering

We're trying to make a led driver in our project and for that, we are using a high frequency transformer i.e. flyback converter. How do I generate a 2MHz frequency square pulse to give to the ...
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73 views

How does a dot matrix led driver know the voltage of an led?

I wanted to make a 7x10 led dot matrix using two 5x7 led dot matrix from lite-on (LTP757KR). I first thought of using shift registers, then I found a 12 x 8 dot matrix led driver with a bunch of ...
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60 views

Power consumption NeoPixels vs. direct control?

At Maker Faire Berlin 2018, an electrical engineer looked at my project which was shown with NeoPixel LEDs (WS2811). He mentioned that the NeoPixels waste a lot of energy. It would be better to build ...
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29 views

Need help finding proper Led driver IC

i am an electrical engineering student and have been tasked in creating a quite interesting project. Basically , the whole PCB with the microcontroller and all other parts is already designed, however ...
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1answer
45 views

Driving 8 x 117W COB LEDs

I am currently attempting to design a LED grow light using the following LEDs but I am having a very hard time finding a sufficient power supply. 8 x Lumileds - SunPlus CoBs DataSheet 51.7 V, ...
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2answers
91 views

How does this LED string work?

I have a LED string with four different lights. The lights are in order red, green, yellow and blue and this pattern is repeated. It has a controller with a button to cycle through fading/blinking ...
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1answer
34 views

Controlling the brightness of LED panel via GPIO pins

I'm trying to control an LED panel like the one in this link. I notice it comes with an LED driver. But what I'm wanting to do is to be able to control the brightness of this light through the GPIO ...
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2answers
61 views

What kind of IC drives this safety LED night light?

This night light LEDs circuit has three 4 positions: off fast blinking slow blinking LEDs always on The big central component is a switch. I was wondering what IC drives the LEDs ? From what I can ...
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192 views

Constant current source gets heated

I am trying to control some power LEDs using a microcontroller. For this I plan to use a transistor based constant current source to protect the LEDs from getting damaged and PWM on the base of the ...
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29 views

Electrical safety measures in LED bulbs for the European market

Which electric safety measures are required to introduce LED bulbs on the European market? Which electric measures prevent that the plastic LED bulbs will melt down or ignite at the end of life? I ...
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3answers
67 views

MOSFET Heating in LED Driver Circuit

I have designed LED Driver circuit using IRF540 and use PC817 Optocoupler for isolation. However, the MOSFETs are heating too much after giving the PWM Signal. One of my LED panels is 110W. What ...
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32 views

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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2answers
89 views

Why constant current led driver is not used in parallel led strip? [closed]

I know that the constant current led driver is not used in the parallel led strip. and constant voltage led driver is not used in the series led strip. can anyone explain me with the example that why ...
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65 views

What am I doing wrong? COB LED with LED Driver

I am relatively new to electronics and I am trying to turn on a Bridgelux BXRC-50C2001-D-74COB LED (Digikey listing, Datasheet ) using a 500mA Mean Well DC-DC LED Driver (LDD-500LW). The LED Driver is ...
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2answers
67 views

Open-loop Buck LED dimming

About this buck LED driver... TL/DR the questions: 1) I intend to drive the FET from a microcontroller PWM via a suitable FET driver. This open loop control scheme seems too simple. Is it a trap? I ...
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1answer
40 views

What is sitting inside LED array so that I can create my own drivers?

I have a LED array and an app to drive it: https://itunes.apple.com/US/app/id1431362600?mt=8 https://play.google.com/store/apps/details?id=com.yskj.led&hl=en_US I connect to WiFi and I'm able to ...
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1answer
67 views

Can someone explain this schematic and how to modify it to add PWM LED dimming?

I bought a LED bulb (AC175-265V, 7W, 59mA) to made some experiments with it and inside there's this circuit: Can someone explain me how this circuit works? The small transformer package with a single ...
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92 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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88 views

Do i need a LED driver to drive 32 mosfets? [closed]

Im trying to use two 16 channel LED drivers to drive 32 mosfets, im not understanding the datasheet about current sinking, maximum voltages etc. Are they meant to drive the LEDs by themselves? ...
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3answers
76 views

7-Segment Drivers: How do they work/how to handle them?

So I know to drive a 7-segment display you need a TON of pins. However there are 7-segment display drivers (such as the MAX7219) that seem pretty popular. However I'm looking at the datasheet, and am ...
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1answer
58 views

AL8860 LED driver does not output required constant current

The LED driver circuit i've made here does not output a constant 1A current. With an input voltage of 12V and 9V total Vf on the three LEDs (CREE LED star), the current is only 0.65A. Am I ...
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50 views

Calculating value of a current limiting resistor in a constant current circuit?

I am using 12 leds in series with 3.0-3.4 v forward voltage and 400-500mA forward current (these values are from the datasheet). I am using a constant current led driver(24-40v and 580mA). My problem ...
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2answers
2k views

DIY LED lamp is less powerful than expected

I am making an LED lamp using an LED strip. The LED strip I am using is a 240 LED/m SMD2835 strip, which operates at DC12V, and is supposed to use 18W of power per meter. My lamp is constructed as ...
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24 views

Autofeel light bar mod [duplicate]

I purchased an Autofeel 30 inch light bar that has 4 rows of LEDs. I have seen this bar advertised under a number of different names, but as far as I know it's the only one with 4 rows of LEDs (they ...
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1answer
56 views

Best way to connect 7 x 18650 Panasonic batteries to 2 LEDs

Looking for some help with correct wiring: I have created a custom 7-cell battery (4 cell block in parallel, 3 cell block in parallel and both blocks connected via series) to produce a 7.4V 23.8A ...
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1answer
40 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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2answers
69 views

LEDs with same current rating but different forward voltages

I have scoured the net for a direct answer but people always end up talking resistor because they don't have constant current. I have a constant current power supply. LEDs are 700 mA and vary ...
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1answer
41 views

Is Adafruit's recommendation for led strip driver MOSFET incorrect?

Adafruit's article ( https://learn.adafruit.com/rgb-led-strips/usage ) states that transistor IRLB8721 can be used with 3.3V or 5V gate voltage to drive LED strip. However, in IRLB8721 datasheet ( ...
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1answer
57 views

LED Controller + LED Panel with common cathode

I have a 3-CH DMX controller (5-24V, 5A/ch, common anode) from amazon (don't know if links are desired here) and a 12V 100W MCPCB LED panel, which unfortunately has a common cathode. The panel is ...
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2answers
126 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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2answers
24 views

LED dimmer/controller: preserve state after loss of power? [closed]

Summary: Are there LED Dimmers that are "always on" and whose settings survive loss of power? Details: I am considering a more or less standard led-strip set (consisting of power transformer/driver,...
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1answer
63 views

So, ?nobody? makes a high(er) current tri state driver chip? [closed]

I'm wanting to charlieplex some 100ma LEDs, and I can hardly believe no one makes a higher output tri state driver. I know how to do it with discretes, but Prove me wrong, please.
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1answer
51 views

How do I interface a microcontroller to the M5480 LED driver

I am attempting to interface an Atmega328PB to an M5480 LED/Relay driver. I'm aware this part is obsolete. The reason I am trying to do this is I have an antenna tuner that uses this chip. An antenna ...
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3answers
1k views

Do output LEDs here need resistors?

Consider: Here is the schematic I'm trying to work around. My major question is about the LED bar graph I want to use, on the right side; does it need resistors? I saw three different versions of ...
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1answer
36 views

Design example for LED driver output that support 0-10V sinking dimmer

I am trying to come up with a device that can connect to 0-10V wall dimmer(sinking) and convert it to corresponding PWM signal. I have trouble understanding how the 0-10V interface has to be designed ...
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1answer
52 views

High Power UV led array for SLA printer

I have a question about a LED array I am designing for a home-made 3D SLA printer. I find the subject of high power led drivers quite confusing but I believe I understand how it works now and I need ...
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1answer
43 views

Typical application for FAN5333B

I have an issue regarding the typical application for FAN5333B LED driver. According to the spec, SW output can achieve 30V to GND. Can this influence the input voltage which is typically about 5V ?...
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2answers
70 views

Understanding inductor and LED ripple current in LM3409

I am reading the datasheet of the LM3409, specifically section 9 "Application and implementation". My intent is to understand how to calculate the values of the components needed for my specific ...
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0answers
24 views

Can LM3914 be set up to work as an exclamation point and alarm flasher with a symmetrical input?

As the title implies I'm trying to make LM3914 to work as an exclamation point and alarm flasher. There is already a set up how to achieve both individually in the documentation from the LED bar ...
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2answers
132 views

Suitable transistors for adaptive motorcycle light project

simulate this circuit – Schematic created using CircuitLab I am working on something very similar to this, Adaptive LED Headlights – Model 8790 Adaptive 2 as a hobby project. I have controller ...
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0answers
56 views

Help to choose capacitor in CYT1000B LED driver circuit

I am planning to build LED driver circuit using CYT1000B (datasheet). The datasheet has this example circuit: (Do not look at bridge rectifier part, it is wrong!) Resistance Rs can be calculated as ...
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2answers
129 views

TLC5940 - with 200LEDs from car battery

I'm working on project that involves 100 white and 100 RGB leds, controlled with 25 TLC5940. I've managed to connect three TLCs to Arduino MEGAv3 and so far so good. I've found out that I have to ...
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1answer
78 views

How do I specify a low RFI LED driver?

I bought a bunch of very cheap 18W LED lamps. I love them; they look great and the light is excellent, however the drivers throw out a lot of RFI and is interfering with my radio (quite bad at 50MHz, ...
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2answers
166 views

What is the purpose of a diode and resistor at the gate of a FET in this LED driver circuit?

I am trying to design a LED driver based the LM3409HV IC. I am using the reference design from TI as a starting point. The schematic in the datasheet has a diode (D2) and a resistor (R5) at the gate ...
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1answer
42 views

Do thermal cutoffs exist that would work with a line that is 40-75V 0.5A and a max temp of ~85°C?

I have a bunch of COB LEDs that I am going to wire in series using an LED driver. The driver gives off between 40-75V and 0.5A max. The circuit should run around 70V and 0.5A. Due to space ...
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1answer
122 views

How to control LED brightness with mosfet as switch and potentiometer

I am designing a circuit to control a high current LED string. Most of the time the led string will be ON. Where should I place a potentiometer to control the brightness of the LED when it is on by ...
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1answer
253 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 ...
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1answer
36 views

Internal constant current driver for LED short circuits and blows when connected to AC main (120v) without DC load

I have AC 85-265V to 0.3A 8-12W DC 22-40V Internal constant current power supply for LED spot lights. This is the exact model https://www.lightinthebox.com/en/p/0-3a-8-12w-dc-22-40v-to-ac-85-265v-...
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3answers
158 views

LED Fault in PCB - Some strings of LEDs intermittently dim

I have a university project that involves working with surface mount LEDs. For some reason, some of the rows of LEDs, when lit up, are dimmer than they should be. This problem is only intermittent ...
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1answer
55 views

led driver negative output and GND

If I connect the positive output of a LED driver to anode and cathode of LED is connected to power ground (Negative output of driver is remain unconnected), whether the LED Will work or not?