Analog Devices LT4294 | Demoboard DC2583A

Beschreibung

Demonstration circuit 2583 is an Ethernet Alliance™ certified IEEE 802.3bt compliant Power over Ethernet (PoE) powered device (PD). It features the LT®4294 PD interface controller and the LT4321 PoE ideal diode bridge controller. The LT4294 provides IEEE 802.3af (PoE, Type 1), IEEE 802.3at (PoE+, Type 2) and IEEE 802.3bt (PoE++, Type 3 and 4) compliant interfacing. It utilizes an external, low RDS(ON) (57mΩ typical) N-channel FET for the hot swap function to improve efficiency.Additional features include power good (PWRGD) and T2P output indicators for interfacing with downstream electronics. The PWRGD output indicates the PD controller is ready to provide power to the downstream load. This signal can be used to enable an isolated power supply. The T2P output indicates the available power from the power sourcing BOARD PHOTO equipment (PSE) to the downstream load. This signal can be used to limit the load and prevent overloading the PSE. The LT4321 controls eight low RDS(ON) (57mΩ typical) N-channel FETs to further improve end-to-end power delivery efficiency and ease thermal design. This solution replaces the eight diodes typically found in a passive PoE rectifier bridge. The DC2583A accepts up to 71.3W of delivered power from a PSE via the RJ45 connector (J1) or a local 48V DC power supply using the auxiliary supply input. When both supplies are connected, the auxiliary supply input has priority over the PoE input.

Weiterführende Informationen

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