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Analog Devices LT4276 | Demoboard DC2047A-A
LT4276, LT4321, LT4320 High Efficiency PoE PD Interface with Integrated Switching Regulator and 9-57VDC/24VAC AUX Support
Overview
| Topology | Flyback Converter |
| Input voltage | 37-57 V |
| Output 1 | 12 V / 1.9 A |
| IC revision | A |
Description
Demonstration circuit 2047A-A is an IEEE802.3at compliantPower over Ethernet (PoE) Powered Device (PD) withsupport for 9-57VDC and 24VAC auxiliary supply input. Itfeatures the LT®4276 PD interface and switching regulatorcontroller, the LT4321 PoE ideal diode bridge controller,and the LT4320 ideal diode bridge controller.The LT4276 provides IEEE802.3af (PoE, Type 1) andIEEE802.3at (PoE+, Type 2) compliant interfacing andpower supply control. It utilizes an external, low RDS(ON)(57mΩ typical) N-channel FET for the hot swap functionto improve efficiency. The LT4276 also provides a DC-DCconverter configured as a highly efficient flyback topologywith synchronous rectification.The LT4321 controls eight low RDS(ON) (57mΩ 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 passive PoErectifier bridge. The LT4320 controls four N-channel FETs (9.6mΩ typical)to replace a diode bridge typically found at the auxiliarysupply input. AC rectification and DC polarity correctionare provided. This solution reduces voltage drop associatedwith the diode bridge and enables the power supplyoperation as low as 9VDC at the auxiliary supply input.This improves end-to-end efficiency and reduces heat.The DC2047A-A accepts up to 25.5W of delivered powerfrom a Power Sourcing Equipment (PSE) via the RJ45connector (J1) or a local AC/DC power supply using theauxiliary supply input. When both supplies are connected,the auxiliary supply input has priority over the PoE input.The DC2047A-A supplies a 12V output at up to 1.9A.
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | Material | LR(µH) | fres(MHz) | Winding Style | Number of windings | L1(µH) | Zmax(Ω) | IR(mA) | RDC max.(Ω) | VR(V) | Version | VIN | VOut1(V) | IOut1(A) | L(µH) | n | VT(V (AC)) | Size | Mount | Data rate | PoE | Ports | Tab | Improved CMRR | Operating Temperature | LED | PHY Chip Mode | Shield Tabs | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPECWE-HCC SMT High Current Cube Inductor, 8.9 A, 9.3 A | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCC SMT High Current Cube Inductor | Performance Rated Current8.9 A | Saturation Current @ 10%9.3 A | Saturation Current @ 30%12.5 A | DC Resistance15 mΩ | MaterialFerrite | Rated Inductance2.8 µH | Self Resonant Frequency36 MHz | – | Number of windings9.5 | – | – | – | – | – | VersionSMT | – | – | – | Inductance8.2 µH | – | – | Size1090 | MountSMT | – | – | – | – | – | Operating Temperature -40 °C up to +125 °C | – | – | – | –Check availability | |||
 | SPECWE-SL5 SMT Common Mode Line Filter, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-SL5 SMT Common Mode Line Filter | – | – | – | DC Resistance360 mΩ | – | – | – | Winding Stylebifilar | Number of windings2 | Inductance [1]3300 µH | Maximum Impedance10000 Ω | Rated Current650 mA | DC Resistance [1]0.36 Ω | Rated Voltage80 V | VersionSMT | – | – | – | Inductance3300 µH | – | Insulation Test Voltage300 V (AC) | – | MountSMT | – | – | – | – | – | Operating Temperature -40 °C up to +125 °C | – | – | – | –Check availability | |||
 | SPECWE-RJ45 LAN Transformer, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-RJ45 LAN Transformer | – | – | – | – | – | – | – | – | – | – | – | – | – | – | VersionTHT | – | – | – | Inductance350 µH | Turns Ratio1 : 1 | Insulation Test Voltage1500 V (AC) | – | MountTHT | Data rate1000BASE-T | PoEPoE+ | Ports1 | Tab PositionUp | Improved Common Mode RejectionYes | Operating Temperature 0 °C up to +70 °C | LED (Left-Right)green/orange-yellow | PHY Chip Modecurrent & voltage | Shield TabsYes | –Check availability | |||
 | SPECWE-PoE Power over Ethernet Transformer, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PoE Power over Ethernet Transformer | – | – | – | – | – | – | – | – | – | – | – | – | – | – | VersionFlyback | Input Voltage 9 - 57 V (DC) | Output Voltage 112 V | Output Current 12 A | Inductance9 µH | Turns Ratio1:1.12:1 | Insulation Test Voltage1500 V (AC) | SizeEFD20 | MountSMT | – | – | – | – | – | Operating Temperature -40 °C up to +125 °C | – | – | – | –Check availability |
| Expected Availability | Opening inventory | Quantity |
|---|---|---|
| Current Availability | – | – |