Power Electronics / Power Management


IEEE802.3af-compliant switch for power-over-LAN

7 May 2003 Power Electronics / Power Management Access Control & Identity Management News & Events Products & Solutions

Maxim's MAX5922, claimed to be the industry's first fully integrated IEEE802.3af-compliant 48 V power switch for power-over-Ethernet (LAN) systems, helps simplify design while reducing external component count and board space. The MAX5922 is used in IEEE802.3af compliant network switches and routers, or midspan power-insertion units that deliver power to network ports. This device allows IP phones, wireless LAN access nodes, and IP security cameras to be remotely powered over the network without causing glitches on the system power-supply rail. Before applying power to a device (load), the MAX5922 detects the presence of a valid 25 kΩ discovery signature and one of the valid IEEE802.3af classification characteristics. An internal 0,45 Ω power MOSFET limits the inrush current during start-up. After start-up, the device provides short-circuit protection. Other features include input undervoltage lockout (UVLO), thermal shutdown, and zero-current load disconnect. Error flags asserted low to monitor faults: UVLO, power-not-good, zero-current detection, and thermal shutdown.



Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Highest increase in global cyberattacks in two years
Information Security News & Events
Check Point Global Research released new data on Q2 2024 cyber-attack trends, noting a 30% global increase in Q2 2024, with Africa experiencing the highest average weekly per organisation.

Read more...
Gallagher Security releases OneLink
Gallagher Animal Management Products & Solutions Access Control & Identity Management
Gallagher Security has announced OneLink, a cloud-based solution that makes it faster, easier and more cost-effective to deploy security anywhere in the world, transforming how security can be delivered to remote sites and distributed infrastructure.

Read more...
Reliable power solution
Conical Technologies Power Electronics / Power Management
The Mibbo MLD-120W-xxVx is a robust DIN-rail mounted DC-DC converter with a 120 W output capacity specifically designed for industrial and automation applications.

Read more...
Easing the path for IPPs navigating local energy regulations
Power Electronics / Power Management
Independent Power Producers (IPPs) and developers venturing into South Africa’s renewable energy sector face an onerous and challenging regulatory landscape characterised by uncertainty in securing grid connections and considerable development costs.

Read more...
Wide input voltage buck-boost converter
Altron Arrow Power Electronics / Power Management
The MAX77859 from Analog Devices is a high-efficiency, high-performance buck-boost converter targeted for systems requiring a wide input voltage range of between 2,5 and 22 V.

Read more...
High-density power module for AI at the edge applications
Altron Arrow Power Electronics / Power Management
The MCPF1412 power module from Microchip has integrated I2C and PMBus interfaces for flexible configuration and monitoring.

Read more...
Development kit for TI’s SN6507
Power Electronics / Power Management
This comprehensive solution is designed to help engineers evaluate the performance of TI’s SN6507 transformer driver for isolated power supplies.

Read more...
Suprema unveils BioStar Air
Suprema neaMetrics News & Events Access Control & Identity Management Infrastructure
Suprema launches BioStar Air, the first cloud-based access control platform designed to natively support biometric authentication and feature true zero-on-premise architecture. BioStar Air simplifies deployment and scales effortlessly to secure SMBs, multi-branch companies, and mixed-use buildings.

Read more...
Advanced surveillance storage from ASBIS
Infrastructure Surveillance Products & Solutions
From a video storage solutions perspective, SkyHawk drives, designed for DVRs and NVRs, offer high capacity, optimised firmware, and a reliability workload rating of hundreds of terabytes per year.

Read more...
The rise of AI-powered cybercrime and defence
Information Security News & Events AI & Data Analytics
Check Point Software Technologies launched its inaugural AI Security Report, offering an in-depth exploration of how cybercriminals are weaponising artificial intelligence (AI), alongside strategic insights defenders need to stay ahead.

Read more...