We enlarged our stock offer of well-proven LEDs in a PLCC-2 package with new improved types.
KA-3528 series of SMT diodes is not a novelty and many of you may know it already for several years, however this series is being continuously enriched with new types. Kingbright as a reliable producer of LEDs always improves their specification, that´s why we also counterchange our offer with new types which overcome their predecessors. It ensures a long-term availability of LEDs in this package and at the same time it ensures still lower power supply demands thanks to a higher luminous intensity of new types.
KA-3528 are universal colour SMT LEDs in a PLCC-2 package, with higher luminous intensity and 20mA nominal current, suitable for backlighting of push-buttons, panels etc. KA-3528 also offers a possibility to choose from several colors (wave lengths) even within one color group.
The PLCC-2 package has good optical properties (reflector) and good thermal properties at the same time, what gives a supposal of a long lifetime. In the recent period we enriched our offer with for example these types – KA-3528LSGS, KA-3528QBCT-G a KA-3528VGS-A.
Detailed information will provide you the datasheets at particular types as well as overview of Kingbright SMT diodes. In case of interest in any Kingbright component, please contact us at email@example.com.
Universal SMT LEDs series KA-3528 will attract attention – [Link]
Researchers at the University of Illinois at Urbana-Champaign and Washington University in St. Louis developed ultrathin, flexible optoelectronic devices – including LEDs the size of individual neurons – that are lighting the way for neuroscientists in the field of optogenetics and beyond.
Optogenetics is the process by which genetically-programmed neurons or other cells can be activated by subjecting them to light. Among other things, the technology helps scientists understand how the brain works, which could in turn lead to new treatments for brain disorders. Presently, fiber optic cables must be wired into the brains of test animals in order to deliver light to the desired regions. That may be about to change, however, as scientists have created tiny LEDs that can be injected into the brain. [via]
Tiny Injectable LEDs Help Neuroscientists Study the Brain - [Link]
Plessey has released samples of their new gallium nitride (GaN) on silicon LEDs. These entry level products, fabricated on 6-inch wafers, are the first LEDs manufactured using GaN on silicon technology to be commercially available anywhere in the world.
Manufactured using Plessy’s proprietary large diameter GaN on silicon process technology, the LEDs are fabricated on a 6-inch line at Plessy’s facility in Plymouth, England. According to Plessey, the combination of standard semiconductor manufacturing processing and the 6-inch fab line provides yields of greater than 95% and fast turnaround , creating significant cost advantage over sapphire and silicon carbide based solutions for LEDs of similar quality. [via]
First GaN on Silicon LEDs Now Available - [Link]
Richard Comerford writes:
The solid-state lighting (SSL) surge has created a concomitant boom market for electronics to drive LEDs in various different applications, ranging from incandescent-replacement light bulbs to architectural lighting to streetlights and more. These new driver ICs and modules do more than simply provide power in the form needed by LEDs. Some devices can perform additional functions that engineers want in designing full-featured lighting system, such as dimming control and thermal regulation. In this article, we will examine some of the latest driver ICs and modules for LEDs, and the choices they offer the designer.
The Latest LED driving ICs and Modules - [Link]
Here is a great application note from Maxim describing the process of designing a high voltage LED driver. The guide goes step by step so it’s easy to follow it.
This application note details a step-by-step design process for the MAX16833 high-voltage high-brightness LED driver. This process can speed up prototyping and increase the chance for first-pass success. A typical design scenario is presented, along with example calculations based on the design constraints. Component selection trade-offs are discussed. A spreadsheet calculator is included to help calculate external component values. This application note focuses on the boost converter topology. However, the same process can be applied to other topologies as long as the underlying equations are understood.
Step-by-Step Design Process for the MAX16833 High-Voltage High-Brightness LED Driver - [Link]
10, 20, 30W LED modules are no rarity anymore and the question how to cool them and to maintain an aesthetic aspect is still more actual.
Sunon, as an innovative producer of reliable fans with many advanced technologies (VAPO, MAGLEV, …) launched on the market cooling modules with a fan and an aluminium heatsink, directly intended for high-power LED applications. As we know, even the latest LEDs transform only a part of the energy to the light and a considerable portion is converting to an unuseful (and for LEDs harmful) heat. Appropriate temperature conditions significantly influence the efficiency and mainly lifetime of LEDs, that´s why a choice of a suitable heatsink plays a vital role at the LED application design.
Modules marked as LA001, LA003 a LA004 (also being marked as TA001, TA003 and TA004) bring an optimal combination of a super silent fan and a robust aluminium profile directly intended for installation of high-power LEDs. In our offer, you can find the type LA003, intended for LEDs up to approx. 31W power. The low-speed fan with the VAPO bearing features dust resistance (DR) and a long lifetime (up to 70 000 hrs). Low rotation speed is also reflected in a low consumption (only 0.28W at LA003 type) and a very low noise (only 16.3 dB). Temperature coefficient is approximately 0,26°C/W and is dependent on real condition on a place of application. The fan of the LA003 module operates already from 6V, what enables to further decrease rotation speed and further extend the fan lifetime in case of usage of a less powerful LED.
Detailed information will provide you the LA003 and LA004 datasheets.
In case of interest, please contact us at firstname.lastname@example.org.
Sunon LA003 cooling module – the right choice for high-power LEDs - [Link]
This (SPI7SEGDISP4.40-1R) is a revised version of the previous SPI seven segment LED display (4 digit) board that displayed numerals and decimal points. The new version has a better quality seven segment LED display (LTC-4727JS) with three extra LED segments, as shown below. The additional colon segments are useful in projects where you need to display time (HH:MM or MM:SS).
New version of MAX7219 based 4-digit serial seven segment LED display - [Link]
Giorgos @ PCBheaven build a MCP1640 boost converter for the next LED light project. This converter can be used with almost dead batteries and will squeeze any remaining energy from them. [via]
What i want now, is something to spice up this hack. So here is what – I used the MCP1640 boost converter to drain the last electron from the batteries. This chip can work with a ridiculous low voltage and provide enough power to drive a couple LEDs. Which means the 2 AA batteries will operate even longer and the LEDs will be much brighter.
High efficiency battery boost regulator using the MCP1640 - [Link]
Macroblock MBI5030, 16-ch constant current LED driver with PWM, SPI-like interface, requires external e clock.
The problem: you need the chip to figure out if your code actually works. And you also need the LEDs to see what’s going on – if at all. You could use a logic analyzer, but that is overkill. Just looking at the LEDs is a much more suitable way. Your code might have insidious bugs, or the datasheet might simply be crap / outdated / obsolete – of course without your knowledge. BUT you surely don’t want to fight wires, at least not during the coding / debugging phase. All you need is the chip + onboard LEDs as indicators.
MBI5030 – 16ch LED constant current LED driver starter board - [Link]
Marian Stofka writes:
Battery-operated equipment often will benefit from a power-on indicator. The indicator, however, can waste significant power. In situations where a low-duty-cycle blinking indicator provides an adequate indication of the power being turned on, the simple circuit described here should prove useful.
Low-duty-cycle LED flasher keeps power draw at 4 mW - [Link]