Questions tagged [led-driver]
An LED driver is a circuit or module that controls the supply of power to [tag:LED]s. Typically, [tag:constant-current] supplies are used, automatically compensating for variation in forward voltage, while limiting power dissipation or controlling intensity. Typical applications for this tag include: wiring microcontroller or logic pins to drive LEDs; transistors, current sources and switching regulators to drive illumination; and self-contained modules.
1,009 questions
2 votes
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How to design a single-wire synchronization topology for multiple LED flashers?
Hello, I want to design a blinking LED module that can run stand-alone, but also synchronize with other identical modules over a single shared SYNC wire. The behavior I’m trying to achieve is: Each ...
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0 votes
3 answers
124 views
Current limiting for high power LED array
I'm working with a group designing some high power LEDs for DIY stage lighting. We purchased an 800W multi-color array chip on board made by Tyanshine (Data sheet: http://www.txled.com/uploadfiles/...
0 votes
2 answers
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Connecting 2 COB in parallel [duplicate]
I have 2 COB chips rated upto 400ma at 36v connected in parallel with a 600ma constant current driver (54v max) On testing both led worked fine but had minor difference in lumens at some levels as I ...
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15 votes
3 answers
1k views
How to fix a bad LED driver design
We designed a small board that has an on-board SMT LED used to indicate a particular condition. This board is a small module that our customers use in their larger designs. After the first release of ...
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0 votes
0 answers
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OZ9998MGN: backlight driver not working
I have Dell U2515Hc whose backlight stopped working. The backlight itself works, tested with LED tester. And I can see pictures, LVDS working. I checked: the boost converter and it provides only 18....
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2 votes
1 answer
130 views
LED Backlight driven by single Li-Ion cell
Disclaimer: this is only for educational purpose and not meant for commercialisation or any other means of production. I got a simple bicycle backlight which worked surprisingly well until one of them ...
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3 votes
2 answers
1k views
What is the purpose of the transistor in the rechargeable LED bulb's circuit?
I drew the attached circuit diagram based on the PCB of the rechargeable LED bulb. It's a commercially available product (made in China). It has a small 4-volt lead-acid battery. Even after charging ...
3 votes
3 answers
598 views
Buck LED driver inductor placement
Why do many LED buck drivers (eg.TPS92511) place the inductor between the load and ground? Other buck converters, used for power supplies, place the inductor between Vin and the load. Are there any ...
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1 vote
2 answers
112 views
Current-limited power supply vs variable voltage LED bulbs [closed]
I try to power a strand of 50 variable voltage 8W LED bulbs (meant for boats and caravans) accepting 12-24 V DC by a 24V LED power supply providing up to 25A - so we have some margin on the 15A ...
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1 vote
1 answer
115 views
Dimmable LED drivers: choosing correct power
I am at a crossroads when choosing correct dimmable power supply for my DLS Rena 9.3W LED lights. In my case, I will be using Shelly Wave PRO Dimmer 2PM as a mains phase-cut dimmer, so now I need ...
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1 vote
1 answer
106 views
LED driver board layout with 555 timer
I am working on an LED driver board with 3 SMD LEDs. It consists of two parts: one is the LED driver itself, while the other one is a NE555 timer to generate a PWM signal for dimming. The schematic ...
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-1 votes
1 answer
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Can LM2596 be used as a LED dimmer driver?
I am trying to use the following LED: https://www.flyrobo.in/3w-3000-15000k-high-power-white-smd-led-light-beads-purewhite?tracking=ads&tracking=4a9a9a&gad_source=1&gad_campaignid=...
3 votes
2 answers
264 views
How can I determine many LEDs I can power with a given LED driver IC?
I'm designing a grow light for hobby horticultural purposes and have chosen this LED for my light source. I have determined that I will need 36 of these LEDs total to fall within the grow light's ...
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6 votes
5 answers
1k views
LED power consumption while OFF
I'm developing a low power device moved by a 150 mAh battery. I need to achieve maximum battery life. This board needs to turn on an RGB LED, I'm using this Cree: CREE LED BCV27 q2,q3,q4 It now ...
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0 votes
0 answers
54 views
LM3414 LED Driver Issues: B and WW Channels Not Working Properly in RGBWW LED Controller
I'm designing a controller for a 100W RGBWW LED using LM3414 constant-current LED driver chips. I've encountered an issue where the Blue and Warm White channels aren't functioning properly. My Setup ...
