Analog Devices LT4295 | Demoboard DC2584A / DC2584A-A

Description

Demonstration circuit 2584A is an IEEE 802.3bt (Draft2.1) compliant Power over Ethernet (PoE) PoweredDevice (PD). It features the LT®4295 PD interface andswitching regulator controller and the LT4321 PoE idealdiode bridge controller.The LT4295 provides IEEE  802.3af (PoE, Type 1),IEEE 802.3at (PoE+, Type 2), and IEEE 802.3bt (PoE++,Type 3 and 4) compliant interfacing and power supplycontrol. It utilizes an external, low RDS(on) (30mΩ typical)N-channel FET for the hot swap function to improveefficiency. The LT4295 controls a DC/DC converter thatutilizes a highly efficient active-clamp forward convertertopology with synchronous rectification.The LT4321 controls eight low RDS(on) (30mΩ typical)N-channel FETs to further improve end-to-end powerdelivery efficiency and ease thermal design. This solutionreplaces the eight diodes typically found in a passivePoE rectifier bridge.The DC2584A-A accepts up to 71W of delivered powerfrom a Power Sourcing Equipment (PSE) via the RJ45connector (J1) or a local 48V DC power supply using theauxiliary supply input. When both supplies are connected,the auxiliary supply input has priority over the PoE input.The DC2584A-A supplies a 12V output at up to 5.5A

More information

• Datasheet
• IC product information