All Questions
Tagged with current-limiting led
60
questions
2
votes
2
answers
113
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TPS2553 Current limiting for RGB LEDs
I'm building a keyboard which will use SK6803 mini-e LEDs (ws2812 driver). I'm using a Pi Pico and as such the USB limit for current draw is ~500mA. I'm looking to limit the current draw from the LEDs ...
- 31
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0
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53
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TPS2553 Current limiting [closed]
Editing this so it can be deleted for double post reasons.
I'm building a keyboard which will use SK6803 mini-e LEDs (ws2812 driver). I'm using a Pi Pico and as such the USB limit for current draw is ~...
- 31
0
votes
0
answers
67
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LEDs without resistors in parallel circuit
I have connected 75 WS2812B LEDs in parallel circuit as shown in manufacturer's datasheet:
Source: https://www.tme.eu/Document/64e8d425b90f84990264129a9679149c/WS2812B-V5.pdf
Since all LEDs should ...
- 131
0
votes
1
answer
70
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50 watt high-power LED current problem [duplicate]
I am using this 50 watt high power LED:
.
And want to power it using this voltage booster:
From 12 V to 34 V as the requirements of the LED datasheet.
Will it work?
I read that I need to limit the ...
0
votes
2
answers
836
views
Calculating current limiting resistor for high current circuits
I am designing a simple three-phase inverter to begin working in power electronics. I have no experience in power electronics and minor experience designing circuits. While working on it, I ...
- 117
1
vote
1
answer
535
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Efficient and cost-effective way to limit current across an LED strip
I am currently attempting to build a DIY driver board to power the backlight of an LM270WQ1 panel.
Per the datasheet, there are six LED strips, each of which take 36V @ 350mA.
The adapter board that ...
0
votes
2
answers
165
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Why is my BJT current control circuit not controlling current?
I have built this circuit (except the Re I bought came out to Re = 0.21 ohms after measuring it, so I used Rin = 680 ohms and R1 = 18k) to control current through eight of these LEDs using this BJT.
...
- 43
0
votes
1
answer
86
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How to limit power to LED, efficiently
I am looking to use a 12V, 5 ampere car battery on a small 5V, 2A LED. Typical applications online use a resistor or voltage regulator, but since I am using a battery I would like to conserve power, ...
- 239
-1
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2
answers
131
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Led strip and relay current splitting?
I have a 12 V LED strip that works at 10 W. I want it to run at multiple current configurations with two relays and without the help of a microcontroller. I am attaching a diagram of my intended setup....
- 690
1
vote
1
answer
68
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LED strip light power
I am looking at using small lengths of single colour 12v LED strip (2835) in a project, maybe just 1 or two sections i.e. 3 or 6 LED's. I have tried single 2 pin LED's and they aren't bright enough.
...
- 11
0
votes
3
answers
833
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How can I figure out what the forward current and forward voltage will be for an LED given a resistor size
We're trying to order some boards from our PCBA manufacturer but they're having trouble sourcing our original LEDs (QBLP601-IW). They proposed an alternative LED (LSM0603443V) and I'm trying to be ...
- 626
0
votes
3
answers
372
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Current limiting or voltage dropping [duplicate]
I was trying to understand the usage for the word "current limiting resistor." Taking an example of a simple LED with a resistor in series, the way I understand this is we are trying to ...
- 1
0
votes
2
answers
360
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Safe to use series resistors for powering common anode RGB LED from single constant current source?
I have a 3-9W common anode RGB LED (https://cdn-shop.adafruit.com/product-files/2524/FD-9RGB-Y2.pdf) and want to vary each leg's voltage with PWM through FETs, namely IRLZ44Ns, and an Arduino, in a ...
- 17
-2
votes
5
answers
2k
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Why can't we light up 4x 3V leds with a 12V power supply?
To calculate the resistor to limit the current, if we use R=P/I² formula, it gives us wrong parameters rather than using V=RxI, so the 12V-12V is 0 and the P formula gives us nothing.
Why is it so?
3
votes
2
answers
102
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Boosting load current of voltage regulator
I'm trying to connect little 3v LEDs to a motorcycle's alternator and i want to regulate the voltage of it to 3 volts so the LEDs don't burn up
the alternator gives off 2.5 volts and over with 3 amps ...
