Heat, handling/vibration, electrostatic discharge (ESD), electrical fast transients (EFT), lightning-induced surges and ageing threaten the reliability of LED lighting designs. High-brightness LEDs are fragile electronic components and these events can damage wire bonds, causing LEDs to fail open-circuit.
If an LED fails open-circuit, then all of the LEDs in that string will go dark. In applications where reliability is critical for safety, or where replacement is costly or difficult, this degree of failure may prove unacceptable. Other costly consequences may include lost sales due to product returns, warranty repair/replacement expenses and negative product reviews.
A Littelfuse PLED series LED protector shunts current around a failed open LED to keep the string lit. The protector automatically resets if the LED heals itself or is replaced. In addition, PLED protectors are available that also provide ESD, surge and reverse power protection. The PLED series is suitable for any outdoor LED lighting application that requires high reliability and low maintenance, such as street lighting, tunnel lighting, traffic signal lights, outdoor signage and runway markers.
The PLED 6/9/13/18 series feature open LED protection and are compatible with 1 W, 2 W and 3 W LEDs that have nominal 3 V characteristic with currents up to 1 A. They are available in a 3x3 QFN package or DO-214AA SMB, while their low on-state voltage reduces power dissipation. Four voltage options (6 V, 9 V, 13 V, 18 V) allow cost savings, since one PLED can protect up to five LEDs.
The PLED 5 series features pen LED, ESD (±15 kV air discharge), EFT (±40 A 5/50ns) and reverse polarity protection. It is compatible with 1 W and 2 W LEDs that have nominal 3 V characteristic with currents of 350 mA and 700 mA, respectively. The protectors are housed in a 2x2 QFN package or SOT-89.
Accelerate development of physical AI deployments Altron Arrow
DSP, Micros & Memory
With Avocado OS now available on the HummingBoard RZ-V2N-
AIoT and SolidSense AIoT V2N from SolidRun, teams can move from prototype to deployed fleet in weeks.
Read more...Universal NFC device Altron Arrow
DSP, Micros & Memory
Delivering high-end performance in a compact 4 x 4 mm package, the multipurpose NFC reader from ST Microelectronics, enables the convenience of contactless interaction and features for various end applications.
Read more...Compact direct Time-of-Flight 3D LiDAR module Altron Arrow
AI & ML DSP, Micros & Memory
The VL53L9 from STMicroelectronics is the first direct Time-of-Flight (dToF) 3D LiDAR all-in-one module in ST’s portfolio, offering a resolution of 2,3K zones, wide field of view, on-chip processing, 100 frames per second, and sensing range from 5 centimeters to 9 meters.
Read more...SoC brings scalable edge AI to life Altron Arrow
AI & ML
The NXP i.MX 937 applications processor is optimised for performance without excessive power draw and bridges the gap between entry-level chips and high-end processors.
Read more...Compact direct Time-of-Flight 3D LiDAR module Altron Arrow
Opto-Electronics Electronics Technology AI & ML
The VL53L9 from STMicroelectronics is the first direct Time-of-Flight (dToF) 3D LiDAR all-in-one module in ST’s portfolio, offering a resolution of 2,3K zones, wide field of view, on-chip processing, 100 frames per second, and sensing range from 5 centimeters to 9 meters.
Read more...Generating negative voltages from a positive supply Altron Arrow
Editor's Choice Passive Components
It is common for IoT devices, industrial sensors, meters, and medical equipment to require both a positive and negative voltage, and this article explains the options available to produce a negative rail from a positive rail supply.
Read more...Addressing latency and signal integrity challenges Altron Arrow
DSP, Micros & Memory
Strengthening Microchip Technology’s data centre solutions portfolio, its XpressConnect retimers support high-bandwidth architectures, while helping reduce integration complexity.
Read more...Precision timing in compact package Altron Arrow
Telecoms, Datacoms, Wireless, IoT
Designed for use in harsh environments, the EX-423 incorporates a four-point mounted quartz crystal structure that improves shock resistance and reduces g-sensitivity.
Read more...EMC limits and levels Altron Arrow
Editor's Choice Circuit & System Protection
As soon as electronics and electrical systems started interfering with each other, the world had to come to some consensus. Considering physics is universal and does not care about what country electrical/electronic products are used in, it should be the same everywhere, right? It is nearly there, but not quite.
While every effort has been made to ensure the accuracy of the information contained herein, the publisher and its agents cannot be held responsible for any errors contained, or any loss incurred as a result. Articles published do not necessarily reflect the views of the publishers. The editor reserves the right to alter or cut copy. Articles submitted are deemed to have been cleared for publication. Advertisements and company contact details are published as provided by the advertiser. Technews Publishing (Pty) Ltd cannot be held responsible for the accuracy or veracity of supplied material.
printer friendly version