All Questions
39
questions
1
vote
1
answer
244
views
Buck Boost Driver to switch 2 LED chains
simulate this circuit – Schematic created using CircuitLab
I'm working on a project to turn 2 LED strings (each containing 6 HB LEDs).
Here is my question.
The Buck Boost driver I'm using is ...
CommunityBot
- 1
1
vote
3
answers
78
views
For a high powered LED loads, is a buck or boost converter more efficient / simpler?
I have a 3 high powered LEDs hooked up into a strip to for the load. For simplicity, I am going with a constant voltage driver. The load can be hooked up in 2 configurations:
Config 1:
3 Green LEDs (3....
- 4,963
3
votes
2
answers
80
views
Current peak on a low EMI buck LED driver
I'm designing a buck LED driver using the LT8376 and I'm following the typical application for a low EMI solution (page 26).
On the output, the schematic proposes a 100 nF capacitor in parallel with ...
- 2,892
3
votes
3
answers
425
views
Setting current on Diodes Inc PAM2863 LED driver IC, with external resistor AND driving different voltage to VSET
I'm looking to use the Diodes Inc PAM2863 DC-DC LED driver in a project.
The datasheet gives a V=IR method for setting the average output current with an external resistor, where Iout = 0.1 / Rs.
...
CommunityBot
- 1
1
vote
2
answers
59
views
Drawer light circuit burns out
I made my own drawer light, but suspect I've done something wrong. After working for a few weeks (lights are only on for a few seconds per day), it stopped working.
Here's the gist of what I did:
U1 ...
- 16.5k
0
votes
0
answers
52
views
How to measure Buck LED driver efficiency
I've build a custom LED driver based on a DC/DC Buck converter with a current feedback loop. It works pretty well, the calculated efficiency shall be somewhere around 95%, but I'm struggling with ...
5
votes
2
answers
591
views
Running 20 WS2812 LED strips (80 pixels each) from a single Arduino and 24V Power Supply with Buck Converters
I am building a matrix with 20 WS2812 LED Strips. Each strip is 80 pixels for a total of 1600 pixels. I want to drive them all from a single Arduino Mega board. To handle the power needs, I have a 24V ...
CommunityBot
- 1
0
votes
0
answers
66
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Constructive Feedback on Grounding in my Buck Converter/LED Driver PCB
Datasheet: https://www.mouser.com/datasheet/2/389/st1cc40-1850179.pdf
Ok, I will come out and say it. After much Googling on grounding Buck converters, I am still a bit confused. I have read about &...
- 15
1
vote
1
answer
62
views
Is it OK to use two vias for a 3A LED return as shown in this ST datasheet?
My circuit is designed for two to three 2.79Vf LEDs @ 3A (Cree XP-L on giant heatsink). It is powered from a 12VDC motorcycle battery.
Link to datasheet
The two vias in question are placed between the ...
- 72.5k
0
votes
1
answer
59
views
Error in ST1S41PHR LED Driver circuit diagram? "Unfinished Nets"
I am just starting trying to design simple circuits (using EasyEDA), and I have an issue with an "Unfinished Net", in this 12Vdc_in, 9Vdc_out, 2.5A Buck Driver circuit.
From the both the ST ...
- 159k
4
votes
1
answer
87
views
Custom conversion of 100 year old navigation lamps to LED
My dad has a 100 year old sailing yacht that he's spent the last 37 years restoring and is almost finished. One of the last few things is the navigation lamps; these would normally use kerosene, but ...
- 59.9k
0
votes
0
answers
72
views
What SOT-23-5 chip is a 90E07 or 4887?
This part is on a buck converter used as an LED driver for outdoor lights. It looks like a 5-pin voltage regulator or comparator with 2 pins on one side and 3 on the other. The markings are:
90E07
...
- 61
1
vote
1
answer
494
views
Sanity checking an LM2596-ADJ constant current supply design for driving LEDs
I've designed, in simulation, an adjustable constant-current supply based on an LM2596-ADJ buck converter IC.
I chose STW8B12C LEDs for simulation because three of them in series roughly matches up ...
- 10.8k
2
votes
2
answers
2k
views
Modify LED headlight with buck converter, to make it dimmable
I only know enough in electronics to be dangerous.
Is there a way to modify this LED board to make it have a dimmable setting?
I was hoping to just remove a resistor and replace it with a variable or ...
- 29
1
vote
1
answer
177
views
Voltage collapses in buck converter when I connect a LED light
I have a 36V ebike battery that I want to use to power my dynamo bike lights (6V 3W LED lights.) I put a switch and a buck converter in between.
The schematic is as follows:
36V 10A Li-ion battery
...
- 17.9k