All Questions
39
questions
6
votes
3
answers
937
views
Reduce output current ripple on hysteretic buck converters
I am learning to use a new type of regulator: a buck with hysteretic control, therefore with no fixed frequency and no output capacitor.
As example, I was trying out the ILD4001 for an LED driver. ...
- 1,305
5
votes
2
answers
492
views
Open-loop Buck LED dimming
About this buck LED driver...
TL/DR the questions:
1) I intend to drive the FET from a microcontroller PWM via a suitable FET driver. This open loop control scheme seems too simple. Is it a trap? I ...
- 79.5k
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 ...
- 51
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
4
votes
2
answers
3k
views
Rewiring USB LED lights to directly use a 5V DC-DC Converter
I'm currently helping a friend who is renovating a VW camper to fit some LED lighting as she has no electrical experience. She has a 10 metre set of LED fairy lights that are powered via USB (bigclive ...
- 41
4
votes
2
answers
413
views
buck converter for high current LED
My first question here:
I want to make a simple adjustable current supply for some LEDs I have (approx 3 V and up to 3 amps). I've decided against just using a single FET to control current as it ...
- 247
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 ...
- 83
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.
...
- 31
2
votes
3
answers
1k
views
Designing brake light with specific luminous intensity
I am currently designing a brake light for a Formula Student car and I am looking into existing solutions on the market for inspiration.
The two specific solutions are this, and this.
The LED I found ...
- 854
2
votes
1
answer
2k
views
A basic buck converter circuit to power 3W LEDs from PC power supply?
I'm just finishing up my first electronics course (edx.org), and I want to build some LED grow lights for starting seedlings in the winter. I have high power LEDs, like this one here, and I have a PC ...
- 1,035
2
votes
1
answer
599
views
Extending battery life: Calculating advantage of adding more batteries
I have a small 3 volt device with an MCU and 8 LEDs that I'm currently powering by two AAA batteries connected in series. With fresh batteries, I start out with about 3.2-3.3 volts and get very good ...
- 1,835
2
votes
3
answers
278
views
Can I get constant current at the output of a buck convertor (to drive a LED)?
I want to drive a LED with a buck converter circuit as shown in the schematic below. In order to keep the circuit simple, the system will run open-loop (i.e.; there won't be any voltage or current ...
- 14.2k
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
2
votes
1
answer
495
views
Driving LEDs with Specific drivers or buck/boost regulation
I have a circuit that is driving 3 x LED rings and an Arduino/ATmega @ 5v through a standard 5v regulator.
Each LED ring draws 11v @ 300mA and is PwM switched using a 2n7000 Mosfet from the ATmega's ...
- 55
1
vote
2
answers
405
views
How do I Power a LED sign?
I have 97 LEDs soldered on to a stripboard in rows. Each row has varying lengths and I have no idea how to power the whole sign at once.
I tried powering 28 LEDs across two rows using a 9 volts (I ...
- 69