Using the new IEEE 802.3bt standard, Power over Ethernet (PoE) can be used to deliver high-speed connectivity up to 90W of power over local area network (LAN) connections. ON Semiconductor has announced that controllers and MOSFETs not only support the new standard power limit, but extends it further to 100W for systems including telecommunications and digital signage.
The IEEE 802.3bt standard for PoE enables more sophisticated endpoints operating across larger networks, explains ON Semiconductor. The IEEE 802.3bt standard optimises energy management through the new Autoclass feature, which enables powered devices (PDs) to communicate specific power needs to the power sourcing equipment (PSE). This in turn allows each PSE to allocate just the right amount of power to each PD, maximising both the available energy and bandwidth.
Three times the power is available with IEEE 802.3bt (90W, compared to the 30W provided by the IEEE 802.at standard, or PoE+). IEEE 802.3bt can provide both power and connectivity to new applications that would otherwise require a dedicated and typically off-line power source. PoE will simplify network topologies and provide a more robust plug-and-play user experience, explains ON Semiconductor.
ON Semiconductor offers the NCP1095 and NCP1096 interface controllers. Both incorporate all of the features needed to implement a PoE interface, including detection, auto-classification and current limiting. The controllers employ either an external (NCP1095) or internal (NCP1096) hot-swap FET. The integrated hot-swap FET in the NCP1096 features the lowest on-resistance available in a Type 3 or Type 4 PoE controller
The controllers are complemented by the NCP1566 DC/DC controller, the FDMC8622 single MOSFET and the FDMQ8203 and FDMQ8205A GreenBridge Quad MOSFETs. These have been developed to provide a more efficient alternative to a diode bridge in PoE applications. Together, these devices enable highly efficient PoE interfaces with up to the standard limit of 90W or to a proprietary 100W.
The company believes it offers a complete family of IEEE 802.3bt-compliant products, to make the technology more accessible and enable more connected devices with guaranteed interoperability.
“PoE is one of the fastest-growing markets for power semiconductors today, with a compound average unit growth rate of 14 per cent expected from 2017 through to 2022,” said Kevin Anderson, senior analyst, power semiconductors at business information provider IHS Markit. “The additional power-delivery capability defined in IEEE 802.3bt enables new applications, such as higher-powered connected lighting, networked high-resolution surveillance cameras and high-performance wireless access points.”
