Analog Devices DC2911A Demonstration Circuit is an IEEE 802.3bt compliant, and LTPoE++ interoperable Power over Ethernet (PoE) Powered Device (PD). The device highlights the LT4293 PD interface controller and the LT4321 PoE an ideal diode bridge controller. The LT4293 offers LTPoE++, IEEE 802.3af (PoE, Type 1), IEEE 802.3at (PoE+, Type 2), and IEEE 802.3bt (PoE++, Type 3 and 4) compliant interfacing. The device uses an external, low RDS(ON) (30mOhm typical) N-channel MOSFET for the Hot Swap function to increase efficiency.
The circuit receives up to 90W of delivered power from a PSE through the RJ45 connector (J1) or a local 48VDC power supply utilising the auxiliary supply input. When both supplies are connected, the auxiliary supply input has priority over the PoE input.