New reference design for PoE adapter

Würth Elektronik now offers its RD022 reference design, 'GB-PoE+ Ethernet USB adapter', freely available from the 'Learn More' link. Devices networked via Ethernet usually rely on a separate power supply, however, if these terminal devices get by with low power consumption, then PoE is an alternative where data transmission and power supply are accomplished via a network cable.

Devices with low power consumption, such as IP cameras, VoIP phones, Wi-Fi routers, network switches, LED lighting or access systems, are appropriate for power supply through the Ethernet line. The company's new reference design, which can provide up to 25W of power, demonstrates how this can work while still maintaining EMC compliance. The adapter is based on the reference design of a 1Gbps Ethernet USB adapter without PoE functionality.

The adapter offers three interfaces: a USB Type-C interface (USB 3.1), an RJ45 1Gbps Ethernet interface with integrated PoE functionality, and a connection for a DC-DC converter with an adjustable output voltage of 6V to 18V and a maximum output power of 25W. The board makes it simpler for customers to get started with PoE technology. The reference design familiarises users with the technology, signals, interface structure, power-up and PoE detection of a Gigabit PoE interface. It supplies the hardware design for PSE and the PD and explains the conception and construction of the adapter board: current flow, USB controller and interface, Ethernet interface, and power supply (PoE). Special importance placed on the EMC-compliant design highlights its significance.