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Analog Devices LT4295 | Demoboard DC2539A-A
High Efficiency IEEE802.3bt (PoE++, Type 3, 51W) PD with Flyback DC/DC Converter and Auxiliary Power Input
Overview
| Topology | Flyback Converter |
| Input voltage | 37-57 V |
| Output 1 | 12 V / 3.9 A |
| IC revision | A |
Description
Demonstration circuit 2539A is an IEEE802.3bt (Draft 2.1)compliant Power over Ethernet (PoE) Powered Device(PD). It features the LT®4295 PD interface and switchingregulator controller and the LT4321 PoE ideal diodebridge controller.The LT4295 provides IEEE802.3af (PoE, Type 1),IEEE802.3at (PoE+, Type 2), and IEEE802.3bt (PoE++,Type 3) compliant interfacing and power supply control. Itutilizes an external, low RDS(ON) (57mΩ typical) N-channelFET for the hot swap function to improve efficiency. TheLT4295 controls a DC/DC converter that utilizes a highlyefficient Flyback topology with synchronous rectification.The LT4321 controls eight low RDS(ON) (30mΩ typical)N-channel FETs to further improve end-to-end power delivery efficiency and ease thermal design. This solutionreplaces the eight diodes typically found in a passive PoErectifier bridge.The DC2539A-A accepts up to 51W of delivered powerfrom a Power Sourcing Equipment (PSE) via the RJ45connector (J1) or a local 48VDC power supply using theauxiliary supply input. When both supplies are connected,the auxiliary supply input has priority over the PoE input.The DC2539A-A supplies a 12V output at up to 3.9A.
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | fres(MHz) | Material | Qty. | Version | VIN | VOut1(V) | IOut1(A) | L(µH) | n | VT(V) | Size | Vaux(V) | RDC 1(Ω) | RDC 2(Ω) | RDC 3(Ω) | Mount | SamplesAvailability & Sample | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SPECWE-HCI SMT Flat Wire High Current Inductor, 6 A, 2.5 A | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Performance Rated Current6 A | Saturation Current @ 10%2.5 A | Saturation Current @ 30%4.7 A | DC Resistance24.5 mΩ | Self Resonant Frequency57 MHz | MaterialSuperflux | Packaging Unit1500 | VersionSMT | – | – | – | Inductance4.7 µH | – | – | Size5040 | – | – | – | – | MountSMT | –Check availability | |||
| SPECWE-HCI SMT Flat Wire High Current Inductor, 29.9 A, 14 A | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Performance Rated Current29.9 A | Saturation Current @ 10%14 A | Saturation Current @ 30%25 A | DC Resistance1.25 mΩ | Self Resonant Frequency507 MHz | MaterialSuperflux | Packaging Unit1500 | VersionSMT | – | – | – | Inductance0.22 µH | – | – | Size5040 | – | – | – | – | MountSMT | –Check availability | |||
 | SPECWE-PoE+ Power over Ethernet Plus Transformer, –, – | Availability – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PoE+ Power over Ethernet Plus Transformer | – | – | – | – | – | – | – | VersionFlyback | Input Voltage 41 - 57 V (DC) | Output Voltage 112 V | Output Current 14 A | Inductance18 µH | Turns Ratio2:1:1 | Insulation Test Voltage1500 V | SizeEFD20 | Auxiliary Voltage12 V | DC Resistance 10.02 Ω | DC Resistance 20.011 Ω | DC Resistance 30.066 Ω | MountSMT | –Check availability |
| Expected Availability | Opening inventory | Quantity |
|---|---|---|
| Current Availability | – | – |