All Questions
Tagged with buck led-driver
33
questions
0
votes
0
answers
259
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: ...
- 69
0
votes
1
answer
214
views
Buck convertor calculation on Vout close to Vin
I'm currently stuck in calculating the right inductor for driving very bright LED's with The TPS92518 led driver. (http://www.ti.com/product/TPS92518-Q1)
This is a 2 channel LED driver and on every ...
- 143
4
votes
4
answers
514
views
Multiple switching LED drivers on single PCB
I am working on a high power LED board project. It requires to have 100 LEDs, of different types and colors. There will need to be 17 individual strands (need to be able to dim them separate.) Max ...
- 736
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
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
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
1
vote
3
answers
350
views
LED buck driver
I'm trying to build a 1A LED buck
It works well, current in leds depends of pwm duty until 1A and more, but when I watch signals with an oscilloscope, there are noise or oscillations on Rsense.
See ...
- 71
1
vote
3
answers
178
views
Is there anything wrong with my current setup for LED
I'm planning on building my own 5W high power LED Lamp, and this is my current setup:
Circuit
My power source is going to be 3 Li Ion Batteries in series, giving 14.8 volts for most of the time.
I ...
- 43
0
votes
2
answers
632
views
Why my boost converter is not boosting the voltage?
I am trying to build a boost converter using LT3517 with 5V input. LED and input voltage(5V) is constant for our application. I need to tune the circuit between this and the current across the LED ...
2
votes
2
answers
1k
views
Why is the efficiency of this LED driver circuit so low?
I created an LED driver board based on PAM2863ECR http://www.diodes.com/_files/datasheets/PAM2863.pdf
The board includes three identical driver circuits to drive three LEDs. I'm not able to wire the ...
- 2,177
1
vote
0
answers
3k
views
PT4115 LED driver
Excuse me if my question is too specific. I'm trying to get an LED driver using PT4115 work. I've spent hours but no success. I've created exactly the circuit depicted in the datasheet.
I have used 0....
- 405
0
votes
1
answer
8k
views
LED bulb can not start properly (BP2832 based)
I bought several LED bulbs about 2 years ago, and now before turn LEDs steady on, some of them flash for some time. Frequency of flashing may differ from bulb to bulb. After some time flashing, they ...
- 7,120
4
votes
2
answers
824
views
Can overshoot current from DC/DC converter damage LED lamp?
I'm building buck converter to drive led lamps. It consists of microcontroller, PWM generator, buck-circuit and current sensor. Microcontroller knows what target current should be and sets duty cycle ...
- 395
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 ...
- 161
0
votes
1
answer
117
views
LM3405 (buck driver) dropout
I've built an LM3405 LED Driver, which works (seem) well. The LED have a 3.2V of Vf and works at 700mA. The regulator uses an external boost voltage of 3V (from an LDO). Reading the datasheet of the ...
- 1,305