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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55 views

Dc to DC converter: “split” one power supply (24V, 5A) into four power sources 5V, max 3A

I have one DC input 24V, 5A. I have designed a 4 channel led driver using the PAM2804 for Cree RGBW leds. I am using 3 of them. So, 3 Rgbw leds, and 3 led drivers. I need to be able to control ...
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LED driver operation vs boost converter operation

I am having this A80604 - LED Driver IC for driving a string of 9 LEDs. Each LED has a forward voltage drop of 3.1V and a forward current of 300mA through each LED. So, I need to generate a maximum of ...
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50 views

Driving strings of high power LEDs - different ways with fault protection

I'm trying to find the best method for driving around 30 x white LEDs plus 10 x RGB. The power supply can be 24V. The LEDs will be dimmable, 3W or 1W, 0.350A or 0.7A (I'd need to limit the current a ...
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27 views

MBI5026 led driver datasheet question

I've bought many MBI5026GF driver ICs. based on the datasheet, the IC set up with MCU and other components is very similar to 74HC595 (Serial to parallel procedure) but with 16 bits of data per IC. ...
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Calculating constant current buck converter ripple current

For building a constant current LED driver, I'm looking at the TI LM3407 datasheet: https://www.ti.com/lit/ds/symlink/lm3407.pdf For calculating the necessary inductor, there's several things I don't ...
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72 views

Constant current LED driver - lowering brightness with dip switches

Having a 28W LED lamp with constant current LED driver which has some dip switches where I can change the current, is it safe to lower the current to reduce the brightness of the LED?
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Microcontroller PWM LED strips driver with N-channel MOSFET

I'm trying to control 12 V or 24 V LED strip (consumption around 5A) with an STM microcontroller. The outputs of the microcontroller are 3.3V PWM. I'm looking to use the following N-channel MOSFET: ...
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Driving Smart LEDs (integrated IC) at 24V

I need the help of someone more competent at deciphering datasheets of obscure components. I am currently building an LED indoor light installation and would like to have hundreds (400-800) of ...
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1answer
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How does series parallel combination of LEDs affect the temperature rise?

I was designing the LED light of 200 W with LED combination of 9 series / 8 parallel, each LED is 6V thus total output voltage is 56V. I am using Meanwell xlg 200 W driver. But this resulted in high ...
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Power dissipation on mosfet with PWM and current regulation

I don't understand the formula for the thermal dissipation of the STCS1A. The datasheet in chapter 8.2 states: Pd = (Vd - Vfb) * Id + (Vcc * Icc) Where ...
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Thermal resistance and JECED standards

Looking at the STCS1A datasheet I read: ...
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1answer
84 views

5V source directly or 12V stepped down to 5V

I'm setting up a circuit to handle a 5V LED strip, which consumes between 500mA and 1A in bursts. The power source is a serial ATA cable which has 5V and 12V lines from the PSU. Without a capacitor ...
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Working of Comparator and LED Driver pin function?

I have this LED Driver - A80604 I need to generate 30V for my LED Driver String for generating 300mA. My question 1 - Both pins ADIM and PWM seem to perform the same function? Both typically take in ...
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Why would you protect a 120-277 LED driver with a fuse that is 600V rated

Sorry about the silly question but is there a reason why you would want to protect a 120-277V LED driver with a fuse that is 600V rated? Does that really protect the device/driver?
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Night LED Lamp with PIR Sensor - Guide to calculation parameters

I would like to make some LED lamps for night use, therefore at low intensity, just enough to see where you are walking, but almost without waking up. ;-) It should only turn on when it detects ...
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28 views

Linear voltage regulator current source high side/low side regulation

My application requires a constant current source for driving LEDs across a large voltage range (60-300VDC), and also the possibility to do this on both the high side and low side of the LEDs. ...
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LED Driver for street light 50W

I would like to design a led driver circuit for street light, 50W led driver. LED/Optoelectronics specification Voltage: 3.3v Current: 60mA power: 0.2w color: white Package:1113(2835 metric) But I ...
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LED Driver Pin function

I have this LED Driver - A80604 I need to generate 30V for my LED Driver String for generating 300mA. In a previous question, I received an answer that I need to fix the current using the LED Driver ...
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Constant Current LED Driver using LM358

I have been working on a project for ACDC Constant LED driver with 1.2A, 36V specifications. While going through the internet, I found one of the circuit and couldn't understand the working the of the ...
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1answer
75 views

Is there an LED constant current driver that works like the UNL2003? [closed]

I need a constant current driver that works like the UNL2003. Most of the LED constant currents drivers use serial communication with an MCU. Are there any ICs that might works like a ULN2003? (input ...
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71 views

Constant current or constant voltage supply? - Setting up LED strips with both series and parallel LEDs on the strips themselves

Up to now, we had 2 COB LEDs ran in series (avoid thermal runaway of UF) driven by a CC power supply (elg-150-c1750b.) We want to upgrade our setup because we found more efficient solutions in the ...
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39 views

Retrieving energy data from dali2 D4i memory bank (202) of a luminare

I'm trying to read the memory bank202 from a DALI-2 supported led luminary for energy consumption. it returns a value of zero. when i gone through the Dali part 252 energy reporting Doc. It asked me ...
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Design LED light system, Lumen low

I want to design a 4-way lighting system using LEDs. This is what I have so far. LED driver: https://www.ledsupply.com/led-drivers/buckblock-dc-led-driver LED: https://www.ledsupply.com/leds/cree-...
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4answers
203 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 ...
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Determine LED with built in driver?

I am looking for a LED that I can use on my first underwater ROV so that I have enough light to record video under water. I am using a 12V battery so I am looking for a bright LED chip around 9-12V / ...
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Best way to control AL8871Q dimming without microcontroller?

Am new to electronics and am planning to use the Diodes AL8871Q to drive a Cree XHP50/70 at 6V 4.8A. Planing to have the driver as small as possible. Looking at the data sheet, I can control the ...
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1answer
58 views

LED Driver IC Current Setting and Switching Frequency

I have this Boost LED Driver IC and this IC is new to me. So, I require some help on how to set the current for my LED String of 300mA. 9LEDs with each forward voltage of 3V and forward current of ...
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39 views

Adding activity indicator LED to 3.3V serial line using enhancement mosfet

I want to make a PCB with a STM32 MCU on it. I will only have a 3.3V supply rail for this PCB. I will be using UART for some communication (AFAIK it is ACTIVE LOW) and I am planning to have activity ...
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66 views

Independent LED control in a matrix

My task is to control 64 LEDs with a 16-output drive. The control of each LED must be individual, that is, the activation of one LED must not interfere in the functionality of another. I'm using an <...
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1answer
35 views

Is this normal that pin 1 & 2 are shorted with HT1628 led display driver?

I just received from China, components to build my own induction cooker (yeah, I know it's strange but I want to add my own features on it ;-) ) and I'm a little disappointed with the build quality of ...
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Must an LCD panel meet specific requirements to support a higher refresh rate?

Newer LCDs can refresh the screen at 120Hz or higher. The driver circuitry for the panel is responsible for pushing frames to the panel at a given rate, but are there any particulars of the LCD panel ...
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HV9910C select Rt resistor

I'm working on a board that has to control some LED chains. Each chain requires about 17-18V (power rail is 24V) with a nominal current of about 450 mA. An MCU will provide the PWM to control the LED ...
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2answers
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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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1answer
52 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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52 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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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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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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1answer
64 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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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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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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4answers
76 views

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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2answers
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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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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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1answer
55 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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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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25 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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1answer
53 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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81 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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