EV3908+8001-00A is designed as the Power over Ethernet (PoE) Powered Device (PD) module. An RJ-45 connector is provided to connect directly to an Ethernet cable having a Power Sourcing Equipment (PSE) driving it on the other end. It also accepts power applied using a stand-alone power supply.
According to the IEEE 802.3af specification, the PD module must provide the circuitry needed to be detected by the PSE as it polls the Ethernet links. The IEEE 802.3af specification also allows the option for the PD to provide classification as to the amount of power needed by the PD Module. EV3908+8001-00A with the MP8001DS provides all the necessary hardware to provide detection and classification together with programmable inrush current limit, power good indicator, thermal protection and current limit. An external 13W Flyback converter is connected as the PWM part of the PD, which is controller by the synchronous PWM controller MP3908DS with soft-start, slope compensation and peak current limiting.