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

Filter by
Sorted by
Tagged with
0
votes
1answer
27 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 ...
4
votes
1answer
46 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 ...
0
votes
0answers
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 (...
0
votes
2answers
32 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 ...
0
votes
0answers
27 views

I2C RGB LED driver interfacing with RGB LEDs

I am working on Pulsonix tool and want to design a PCB with an MCU communicating with this I2C RGB LED driver (https://www.ti.com/lit/ds/symlink/lp5036.pdf?&ts=1589899889719) to drive a group of ...
0
votes
0answers
22 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 ...
0
votes
0answers
27 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 ...
0
votes
0answers
10 views

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 ...
1
vote
3answers
69 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 ...
0
votes
2answers
49 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 ...
0
votes
3answers
66 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 ...
0
votes
1answer
45 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 ...
0
votes
1answer
31 views

LED Driver Output - Current Adjustment Range

I bought this Led Driver(HLG-480H-48A) for my Strips that use around 43V 9A. I've never used a LED driver before and have got a few questions about them: The output current adjustment range (...
-3
votes
1answer
55 views

How a blue LED works and how this affects how the LED driver is set up? [closed]

How a blue LED works and how this affects how the LED driver is set up? Is Someone here have a good explaination?
0
votes
2answers
24 views

Constant-current driving with LED Driver and Boost DC/DC converter

Novice here, sorry if I'm missing something obvious. I'm trying to drive 4 strips of 6 low-power RGB LEDs each (APF3236LSEEZGKQBKC) on a 3.3V battery. I have a 12-channel LED Driver (TLC6C5912) which ...
0
votes
1answer
55 views

How to build a complet circuit with the following led in left and the following circuit in the right? [closed]

How to build a complet circuit with the following led in left and the following circuit in the right? ¨
0
votes
1answer
35 views

Understanding the application of a switching regulator as a constant current LED driver

There is an application note from ON-semiconductors which provides a few diagrams to use a well known MC34063 switching regulator as LED driver. it's around the idea of setting the 1.25v feedback ...
0
votes
2answers
73 views

Efficiently driving 6 LEDs in parallel

I have a display that has six white LEDs in parallel (common anode) as backlight. The LEDs' forward voltage is 3.2V, the current per LED is 20mA, so 120mA in total. The available voltages in the ...
0
votes
1answer
44 views

Connect LED-driver (BJT) in circuit

I need some help in this circuit! How can I connect LED-driver (BJT) in this circuit? Then what is the valus of RB and RC that meet the requirements, so that the LED driver works properly. ...
0
votes
2answers
50 views

Make my battery level indicator dimmable

I wired up this battery level indicator using a 9V battery (power supply is for ease of changing voltage.) It works well with only D1 lit at 6 volts up to all five LEDs at 9 volts. My problem is ...
0
votes
0answers
29 views

Help needed for driving 160 nos - 1.5W RGB SMD LEDs (5074 footprint)

I'm a planted aquarium hobbyist and have been making DIY led lights with 3W LED chips (white and other colour leds in 4 separate channels) driven with meanwell LDD dimmed with arduino. However ...
0
votes
1answer
36 views

Driving and dimming TFT LCD backlight

I have to add driving/dimming circuit to the design based on NHD-1.8-128160EF-SSXN-F display. The schematics suggested by the manufacturer is practically taken from MIC2289 datasheet (Figure 4-4). ...
1
vote
0answers
35 views

Source voltage driving a series LED strip seems below combined forward voltage

I am currently working on a project to build a digital clock. The digits of the clock are to be made from custom-built seven-segment displays. Each segment of a digit will be made up of a couple of ...
1
vote
1answer
51 views

BJT Constant Current LED Driver - Inverted behavior?

I'm trying to use build a constant current Led driver, using two BJTs (BC338 and BC547). The idea is to be controlled by Arduino's PWM, for dimming. I'm using the circuit bellow. The led is a white ...
0
votes
2answers
67 views

High voltage (220V) constant current LED driver using transistors

This electronic circuit is a constant current LED driver using two transistors. It is designed to work with low DC voltage like 5V or 12V. But I'm wondering if it is possible to connect it to 220V ...
1
vote
1answer
34 views

TLC59116 will not drive LEDs

Having the hardest time with this TLC59116 LED Driver IC from Texas Instruments. I have done a crazy amount of debugging and still cannot get it to drive a single LED. I have followed all the ...
1
vote
2answers
74 views

Help with powering LED strips from a LED TV

I have two LED stips salvaged from a LED TV. I only have these to LED strips and the ribbon cable that was connected to them from the TVs screen and not other PCB boards or components to help power ...
0
votes
0answers
64 views

MeanWell PWM dimmer

I'm trying to pilot in PWM 0-10v with a RPI the dimmer input of a MeanWell's HLG-80H-48B LED PSU. It doesn't work at all !! any hint of what could be wrong ? You can find on the following link, the ...
0
votes
0answers
23 views

How do I control the latch signal for the TLC5958 LED driver?

I would like to drive 512 RGB LEDs with individually controllable brightness. My plan is to 8-way multiplex them so I would like to use an LED driver that is designed for multiplexing LED displays. I ...
0
votes
0answers
73 views

Help refining a current control loop circuit

As a follow up to this question. (Sorry if this linking other posts is wrong. I'm new to forums) Will this design for an XHP70.2 LED Driver with arduino control work to the params specified? TL;DR: ...
0
votes
1answer
37 views

Will this design for an XHP70.2 LED Driver with arduino control work to the params specified?

I am making a driver PCB to drive an XHP70.2 LED at 15A (~7v) Continuous, Controlled from an Arduino. I am new to OpAmp's so I would like to know: Does this circuit look as though it would function ...
1
vote
4answers
50 views

AL8860 Led Driver: inductor placement

I have two questions concerning the placement of the inductor in an led driver circuit using the AL8860 by Diodes Inc.. I'm refering to the typical application circuit below: In their layout ...
0
votes
1answer
66 views

Replacing an LED power supply - but originally there were 2 supplies connected parallel

I have a LED lamp. It went wrong and I found out that it's power supply is the cause. Originally two of these supplies were connected parallel (their output connected parallel): Input: AC90-265V 50/...
0
votes
1answer
59 views

LED Lights Power Issue

I'm a first time user of both LED lights and this website so i hope i can get some help. i've bought some RGB LED lights and connected 5 reels ( 5x5M ) all to the one power supply, which inevitably ...
0
votes
1answer
42 views

Power dissipation of TLC6C5712-Q1 LED Driver IC

I am using this TI LED Driver IC to drive 9 LEDs I want to calculate the Power Dissipation of the Resistor (20k 1% 0402) which I have connected to the IREF pin. To calculate the power dissipation of ...
1
vote
1answer
163 views

Why this LED strip is emitting light if any driver output wire alone is connected to either one of its terminals but only near the floor?

I was experimenting with LEDs, when I encountered the following strange behavior: 5 LEDs on a strip simultaneously emit light when I connect eny output wire from a mean well +36V 700mA constant ...
0
votes
4answers
129 views

Can reversing AC polarity of one of two adjacent LED bulbs reduce overall flickering in a room?

Can reversing ac polarity of half of the bulbs in a chandelier bring the flickering out of sync (out of phase) so that half of the bulbs are ON while the others are OFF? I mean the AC polarity of the ...
0
votes
0answers
65 views

Having a non constant current in a constant-current LED driver

I am using the TPS92511 LED driver as follows : It is not on a PCB but a veroboard with wires so it is not a perfect circuit. I have chosen Riadj to 4.9 kΩ which should give me something ...
2
votes
3answers
47 views

Solutions to fix LED light RFI/EMI?

Almost every LED light I've tested (hold an AM or shortwave radio antenna nearby) emits RFI or EMI across a vast frequency range. The EM noise comes either from the base of the bulb, or from some box ...
0
votes
0answers
45 views

WS2815 Erratic Color display

I have a two strips of WS2815 neopixel LED lights (400 pixels per string) being driven by WeMos D1 minis with the WLED library to control them. Since the two strips are on opposite sides of my porch, ...
0
votes
0answers
64 views

Change white LED in HD camera to IR LED

I need to change white LED in cameras to IR LED because the white light interferes with other cameras IR LED based night shooting. have found out the LEDs I have are 3 x 3 x H 1½ mm works with a VF 2....
0
votes
1answer
51 views

Am I thinking about this correctly regarding 12V, 24V and 120V LED lighting?

Most of the LED light strips I see are either 12V or 24V, which require a driver to step down the power from 120v at the wall (thus the little black transformers that come with them). However... I ...
1
vote
0answers
44 views

Some of LEDs connected in series remain on

I know that even tiny leakage currents can make an LED glow weakly and there are many answers to similar questions, but my problem is different. I have 6 power LEDs connected in series and they are ...
0
votes
0answers
21 views

LED driver logic, analog & power grounds & signal integrity

I am using a TLC920 LED driver and it has three ground pins: Logic, Analog and LED. What are some best practices for a layout with these? All three with be joined somewhere and my understanding is ...
2
votes
1answer
57 views

How to light on/off LEDs controlled by a LED driver?

I want to use a step-down LED driver and configure it to deliver a constant current to some LEDs. This one looks nice: https://www.diodes.com/assets/Datasheets/AL8843Q.pdf I can control the ...
3
votes
1answer
65 views

How do I get a sharper off time curve on my Led driver output?

I designed a pcb with the following dual led circuit based around the TPS92518: I would like to turn on and off the Powerleds in the <1ms range. At the moment our camera stills sees the leds a bit ...
0
votes
1answer
65 views

How do I know the input current of a LED driver?

I want to driver 3 power LEDs and depending on the solution I choose I find something strange. If I have this situation : I want 330 mA flowing in my LEDs. I choose a 10 V DC-DC converter. The ...
2
votes
1answer
65 views

Controlling 2-lead, 2-colour LEDs

An open appeal for a simple way to control 2-colour, 2-lead LEDs. I am using these LEDs as the 'mimic' lights for my model train layout point control. Working on 12v DC, the point motor is wired to ...
0
votes
2answers
69 views

LED Strip / Resistor Heater + Driver Circuit

For my astrophotography equipment, I need to construct a dew heater and a flat field generator. A dew heater is simply a bunch of resistors connected in parallel such that each resistor outputs about ...
0
votes
4answers
100 views

Powering LEDs, dim LED in parallel

I want to build an light fixture for my aquarium and decided to use LEDs, almost everywhere it's suggested to wire the LEDs in series. but that will need a high voltage for many high power LEDs. also ...

1
2 3 4 5
10