All Questions
39
questions
1
vote
3
answers
77
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....
- 407
3
votes
2
answers
77
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 ...
- 83
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 ...
- 111
0
votes
0
answers
50
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 ...
0
votes
0
answers
65
views
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 ...
- 15
0
votes
1
answer
58
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 ...
- 15
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 ...
- 41
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
491
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
...
- 23
1
vote
2
answers
234
views
What power supply do I need for this LED driver?
I'm putting together a project where I'll be driving 4 x 10W RGB LEDs (these ones) with one PicoBuck LED driver. I'll be using all three channels on the LEDs at the same time and controlling dimming ...
- 19
0
votes
1
answer
310
views
Using a buck converter with potentiometer for my battery-operated fairylights -- Blinking and no read-out on voltmeter
I'm an extreme newbie when it comes to electronics, and decided to just dive right in.
I wired up my buck converter exactly like how it's done here: https://www.youtube.com/watch?v=fmdxSRaVPVg
Without ...
- 3
-2
votes
1
answer
94
views
Reverse voltage in LED buck converter circuit [closed]
The circuit
simulate this circuit – Schematic created using CircuitLab
Everything is fine except when the switch is open, I measure ~-3.5V on the points marked.
Why is that and is it ...
- 930