All Questions
Tagged with buck led-driver
33
questions
1
vote
1
answer
67
views
PI filter for two buck drivers for a low-emi solution
I'd like to save space on a circuit that uses two buck LED drivers. The circuit is designed for a low EMI solution and there are two separate PI filters on each Vin pin (recommanded on the datasheet). ...
- 83
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
4
votes
2
answers
763
views
Please offer comments, critique on self-resonating invented buck joule thief converter for third world use [closed]
Even though I'm not an EE, I have simulated the Joule Thief to death in LTSpice, but I have not yet made a prototype of this circuit. I have a friend who is an EE who won a contract to light some ...
- 2,882
0
votes
0
answers
73
views
How to make a hight power strobe light (ACL) with arduino and high power LED
I'd like to make a high power strobe anti collision light (ACL) for aviation.
The available power source is 12 - 13 V DC.
The strobe pattern should be programmable / adjustable, therefore an arduino ...
0
votes
1
answer
87
views
STCS05DR LED driver
I am trying to use the STCS05DR constant current LED driver IC by STMicro in my buck converter design to indicate input power with a 1206 red LED.
The input power is a variable DC battery source (...
0
votes
1
answer
362
views
How to remove 200 mV ripple from my power supply? [closed]
I am using a step-down-converter to get a variable supply output in the range of 2-4 V from a 5 V input voltage from an adapter.
The problem I am facing is that I get a 200 mV ripple which looks like ...
- 65
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
1
vote
2
answers
76
views
Improve thermal effeciency of buck LED driver with fixed supply rail
I have this driver circuit that uses an ILD8150:
There are two identical sections of this module on my PCB.
One powers 6 LEDs the other powers only 2 LED. The Vf of the LEDs is 2.85V @ 350 mA.
So the ...
- 1,225
0
votes
0
answers
68
views
Question on resistor voltage dropper values for VCC supply of LED driver IC
I was designing the PCB for a 10 W LED driver with the AL1676 controller. From the datasheet, the application circuit shows that the driver takes its VCC supply through R1 and R2. The maximum value ...
- 1
0
votes
1
answer
94
views
Inductor position in low side buck converter
I am designing a PCB to control an RGBW-LED. To provide a regualted current for each color I am using the LM3407 buck converter from TI. The buck converter is powered with 12V and is configured to ...
- 285
1
vote
1
answer
71
views
TPS9264x Synchronous Buck Controllers for Precision Dimming LED Drivers
I have some questions about TI's TPS92641.
Please see below:
1.) Does anybody know the principle of Chopper OTA? there are no too much information in the datasheet.
2.) What's Quasi-hysteretic ...
- 413
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
1
vote
1
answer
1k
views
What is the difference between buck and step-down converter
I always thought "buck" and "step-down" are synonyms. But now I'm looking at two datasheets:
CAT4201
CAV4201
They seem very similar, but the first is described as "350 mA ...
- 1,225
1
vote
0
answers
148
views
Calculating constant current buck converter ripple current
For building a constant current LED driver, I'm looking at the TI LM3407 datasheet: https://www.ti.com/lit/ds/symlink/lm3407.pdf
For calculating the necessary inductor, there's several things I don't ...
- 111
5
votes
1
answer
686
views
36x LED 5730 in series: diodes burnt when LED driver (based on BP9833A or MT7854BD) powered up
Background:
I have 18W, 36 LED lamp fixture which I cannot change.
Originally it has 2x parallel 18off 5730 LEDs and 300mA driver. It works for some time, but diodes starts burning. I thought that ...
- 61