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Analog Devices LT4295 | Demoboard DC2584A / DC2584A-A
High Efficiency IEEE 802.3bt (PoE++, Type 4, 71W) PD with Forward DC/DC Converter
Overview
| Topology | Buck Converter |
| Input voltage | 37-57 V |
| Output 1 | 12 V / 5.5 A |
| IC revision | 1 |
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
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | fres(MHz) | Qty. | RDC typ.(mΩ) | RDC max.(mΩ) | IR(A) | L1(mH) | RDC max.(Ω) | VR(V (AC)) | VT(V (RMS)) | Material | L(mm) | W(mm) | H(mm) | Mount | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPECWE-HCI SMT Flat Wire High Current Inductor, 4.9 µH, 8.3 A | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance4.9 µH | Performance Rated Current8.3 A | Saturation Current @ 10%2.2 A | Saturation Current @ 30%6.5 A | DC Resistance14.5 mΩ | Self Resonant Frequency56 MHz | Packaging Unit1000 | – | DC Resistance15.95 mΩ | – | – | – | – | – | MaterialSuperflux | Length7 mm | Width6.9 mm | Height4.8 mm | MountSMT | –Check availability | |||
 | SPECWE-XHMI SMT Power Inductor, 8.2 µH, 13.4 A | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-XHMI SMT Power Inductor | Inductance8.2 µH | Performance Rated Current13.4 A | Saturation Current @ 10%9.4 A | Saturation Current @ 30%20.45 A | DC Resistance10 mΩ | Self Resonant Frequency16 MHz | Packaging Unit300 | DC Resistance10 mΩ | DC Resistance11 mΩ | – | – | – | – | – | – | Length11.6 mm | Width10.5 mm | Height8.8 mm | MountSMT | –Check availability | |||
749022016 | SPEC10/100/1000 Base-T SMT Transformer, 350 µH, – | Availability – | Downloads– | Status Activei| Production is active. Expected lifetime: >10 years. | Product series 10/100/1000 Base-T SMT Transformer | Inductance350 µH | – | – | – | – | – | – | – | – | – | – | – | – | Insulation Test Voltage1500 V (RMS) | – | Length18.16 mm | Width16 mm | Height10.16 mm | MountSMT | –Check availability | ||
 | SPECWE-LF SMT Common Mode Power Line Choke, 2200 µH, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LF SMT Common Mode Power Line Choke | Inductance2200 µH | – | – | – | – | – | Packaging Unit200 | – | DC Resistance100 mΩ | Rated Current2.75 A | Inductance [1]2.2 mH | DC Resistance [1]0.1 Ω | Rated Voltage250 V (AC) | Insulation Test Voltage1500 V (RMS) | MaterialMnZn | Length23.3 mm | Width18.5 mm | Height11.5 mm | – | –Check availability |
| Expected Availability | Opening inventory | Quantity |
|---|---|---|
| Current Availability | – | – |