Tagged Questions

0
votes
1answer
26 views

TLC 5952 Blank pin control

Can BLANK pin of TLC5952 device be permanently connected to ground or does it need to be toggled (once at the startup or each cycle...)?
0
votes
2answers
65 views

How to drive 32-by-32 (or more) LED matrix?

I have a matrix of 32-by-32 LEDs that I need to control using a driver. The largest driver that I found was a 16-by-16 driver by Linear Technology, and there is no driver that goes higher than ...
2
votes
1answer
47 views

Is NRTL approval required for the sub components I purchase and assemble into a final product in order to sell the product in USA?

I manufacture a lighting product made up of components I purchase and then assemble into a housing and heat sinks that my company manufactures. The components I assemble include an electrical driver/ ...
1
vote
1answer
92 views

how to control constant current led driver output with pwm?

i want to control brightness of led series with constant current power supply. but when i connect the power supply output to pwm controller and led series, i cant control the brightness because power ...
3
votes
1answer
134 views

Higher current LED driver for persistence of vision display

Project needs We need an inexpensive LED driver IC that: Can source or sink at least 15mA/LED Has an SPI-like interface (not I2C) Has a separate latch pin Has at least 256 grayscale intensities ...
1
vote
2answers
115 views

Controlling a Servo with a TLC5940 (calculating PWM setting)

I'm trying to control a few servos and a bunch of RGB-LED from an arduino board. To do that I'm going to chain together a few TLC5940 chips. The issue I'm trying to resolve at the moment is what PWM ...
0
votes
1answer
32 views

TLC59116 (Y59116) maximum output current

I bought this IC (http://www.ti.com/lit/ds/symlink/tlc59116.pdf) to power a few RGB leds. I was under the impression that it could drive up to 100ma per channel, constant current. However in practice ...
4
votes
1answer
170 views

LED driver circuit interfering with 555 timer?

Below is a circuit I put together that uses a 555 timer and an LED Driver: But the strange thing I see is that the timer does not follow the 1.1*R*C equation. The led remains lit for much longer. ...
1
vote
0answers
89 views

Can I add dimming to a high voltage LED driver

I have an LED panel with 288 LEDs. Two banks of 144 in series. The voltage at the input of each string is 450v and the rated output of the panel is 36W. Currently, there is no dimming capability and I ...
1
vote
1answer
42 views

TLC5926 With No Load

I've read here that running the TLC5940 with no load can cause some issues with it drawing excessive power. The TLC5926 is a constant current driver rather than a PWM driver. It seems to me that since ...
2
votes
1answer
115 views

PWM & NUD4001 LED driver

Today I tried to build a small circuit which basically consists of three NUD4001 LED driver, three n-Channel FETs and a RGB Power LED from SEOUL. I don't have the exact specs ready but the main specs ...
20
votes
5answers
836 views

Why would one drive LEDs with a common emitter?

I've seen tutorials aimed at beginners suggest the way to drive an LED from something without enough current drive is this: (option A) but why not this: (option B) Option B seems to have some ...
27
votes
1answer
951 views

How can I efficiently drive an LED?

I understand that I can not connect an LED directly to a battery because it will draw too much current. Thus, there must be something else in the circuit to limit the current. What options are there? ...
3
votes
1answer
385 views

Why is my constant current source (LED driver) pulsing?

I bought a current source to try to power some high brightness LEDs. The LEDs take 350mA so I found a current source on digikey that matches that and ordered it: ...
6
votes
3answers
566 views

Best way to control 130 - 140 LEDS with Arduino Uno 32/64 bit led drivers?

I am new to electronic prototyping and had a few questions. I need to control 132 LEDs individually. I want to make 3 rows ( 2 rows of 60 and 1 row of 12) I think i can matrix them but i would still ...
1
vote
2answers
170 views

LED Driver Sink Current

The specs of TI TLC5944 LED driver says "constant current sinking" capability is 60-mA.(LED Power supply voltage up to 15 Volts, and Vcc=3.0V to 5.5 V ) My understanding is if Sink current is low, ...
8
votes
2answers
273 views

High Current Pulse on LED

According to Cree Inc Pulsed Over-Current Driving of Cree® XLamp® LEDs app note, driving LEDs with high current pulses can be performed as long as the following guidelines are respected: Based on ...
1
vote
0answers
202 views

Using a diode or resistor, to supply minimal voltage to LED Driver (Help!)

I'm using a dual 60W LED multi-chip pendant lighting (a.k.a. "high bay" pendant light with two 60W LED chips). This light is using an RGB driver (one per multi-chip) that has a remote control to ...
2
votes
2answers
184 views

CREE LED and Driver

I have this LED. And I have this driver. I'm trying to use it to drive the LED however when I hooked up the one LED to the driver it started smoking. I measured a voltage of 48V while it was working ...
2
votes
1answer
228 views

Serial LED driver with individual PWM, compatible with common cathode bargraphs?

I bought one of these circular bargraphs from Sparkfun. A 16 LED bargraph with two common cathodes. I'd like to drive it from a single chip to free up I/O on my micro, and not take a bunch of cycles ...
4
votes
1answer
197 views

Which LED driver?

My company wants to produce LED lamps. In order to do that I searched a lot for LED drivers. They are lots of LED driver circuits in the world and IEEE papers or patents. I want to chose between them ...
1
vote
2answers
2k views

Designing high-power LED driver with PWM

Update: Provided I set up the PIC and program it correctly (planning on using this guide to interface it as a USB HID device), would this be a suitable configuration? I'm not entirely certain how I ...
2
votes
1answer
209 views

High powered driver for 10W and 45W LEDs

I have 8 x LZ4-00B200 (14V, 700ma operating) and 8 x LZ4-00R200(9V, 700ma operating) which I would like to wire off of one power supply. My problem is two fold. First, how should I organize the 16 ...
3
votes
3answers
259 views

TRIAC Dimming for LED Buck controller circuits

How can you create a solution for a LED constant current driver that can handle TRIAC dimming? Can you convert the waveform into a PWM and is there a simple solution?
5
votes
3answers
2k views

How to drive high powered LEDs as efficiently as possible

I have come across some very high powered LEDs. Datasheet for LEDs http://www.cree.com/led-components-and-modules/products/xlamp/arrays-nondirectional/xlamp-cxa2011 My question is: for these high ...
5
votes
3answers
983 views

How can I effectively drive multiple LEDs with multiplexing?

I am interfacing my microcontroller (AVRmega32U4) to a 4x4 LED array. There are 2 control lines to operate columns (passed to a 2 to 4 demultiplexer) and 4 control lines to operate rows. I bring a ...
10
votes
3answers
475 views

Possible causes for 7-segment LED flicker

I'm working with a vendor overseas to revamp an existing product. We're trying to keep cost down. Currently the product consists of: 4 large buttons 4 double digit 7-segment LEDs. (each button has ...
2
votes
1answer
329 views

LED Driver IC STLED316S

I am struggling with reading the datasheet for the STLED316S 7-segment/Discrete LED driver IC. I'm writing code for an STM32 chip, but also using Arduinos as well. I'm having no problems writing the ...
0
votes
1answer
258 views

4094N VSS Supply Pinout Error?

I'm currently building an Arduino based LED driver using a set of three CD4094's, I'm slightly unsure of an error I'm getting with my Eagle schematic. The error message reads: 'No SUPPLY for implicit ...
2
votes
2answers
715 views

Arduino and LEDs Power Supply Question

First, thank you to anyone taking time out of their day to read this and answer. Resources like this are incredible for amateurs like myself. My question is based around power supplies, Arduinos ...
1
vote
1answer
651 views

How does AS1130 132-channel LED driver work?

I was just checking out the AS1130 and I was wondering how you are able to drive a 12x11 array of LEDs using only 12 wires? Could anyone explain this to me?
3
votes
3answers
521 views

Question on RGB LED Array

I have been looking around at 4x4x4 and 8x8x8 LED Cubes and I had a couple of question about them. A few I have seen have a full range of colors from the LEDs which I am assuming means they are using ...
5
votes
4answers
3k views

Adjustable linear led driver? Linear, not PWM

I'm working on a product that requires an led to output currents varrying from 0mA to 350mA and as many possible levels in between (~1000 would be sufficient I suppose). I CANT output a PWM signal to ...
0
votes
3answers
386 views

Replacement for the MC14495-P1

I need to find a device I can use in place of the MC14495-P1 binary to hexadecimal LED driver. This part is sadly very scarce and very expensive these days. The device is a 16 pin DIP with +5V on ...
8
votes
2answers
458 views

Can I replace this circuit with an IC?

I moved my Arduino-logic-level-5V-to-12V-LED strip circuit off project board and onto Veroboard and I'm very proud to say everything worked first time: (I'm not at all proud of the soldering job, ...
2
votes
1answer
63 views

What's a good substitute for the TD62783AFNG?

According to its datasheet, the TD62783AFNG is an 8-channel high-voltage high source-current driver. It is a Darlington arrangement that can source (not sink) up to half an amp through a pin. What ...
1
vote
1answer
546 views

Problems driving leds with the MM5450

First what is my final goal: to drive 24 RGB LEDS using a microcontroller connected serially to a Micrel MM5450 LED driver. It would be nice to be able to drive all of them individually (72 LEDs), but ...
8
votes
5answers
8k views

Best way to control 75 LEDs with Arduino

I need to control 25 groups of 3 LEDs or 25 RGB LEDs. Each group will be dismissed from the uC by up to 20 cm (about 8 inches). 20 cm is very safe assumption but I think it will be 10 cm or less. ...
2
votes
3answers
278 views

Current source for CREE XLamp XP-G

Looking to play around with the CREE Xlamp series LED and was wondering what would I need to drive them off 110V household power? Output current needs to be in the range of 800-900mA. EDIT: I am ...