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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 | Version | VIN | VOut1 (V) | IOut1 (A) | L (µH) | n | VT (V) | Size | Vaux (V) | RDC 1 (Ω) | RDC 2 (Ω) | RDC 3 (Ω) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 744316470 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-HCI SMT Flat Wire High Current Inductor | 6 | 2.5 | 4.7 | 24.5 | 57 | Superflux | SMT | – | – | – | 4.7 | – | – | 5040 | – | – | – | – | SMT | ||
| 744316022 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-HCI SMT Flat Wire High Current Inductor | 29.9 | 14 | 25 | 1.25 | 507 | Superflux | SMT | – | – | – | 0.22 | – | – | 5040 | – | – | – | – | SMT | ||
 | 750316116 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WE-PoE+ Power over Ethernet Plus Transformer | – | – | – | – | – | – | Flyback | 41 - 57 V (DC) | 12 | 4 | 18 | 2:1:1 | 1500 | EFD20 | 12 | 0.02 | 0.011 | 0.066 | SMT |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 744316470 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | |
| 744316022 | SPEC PCN pendingDue to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff. | |
| 750316116 | SPEC |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | Material | Version | VIN | VOut1 (V) | IOut1 (A) | L (µH) | n | VT (V) | Size | Vaux (V) | RDC 1 (Ω) | RDC 2 (Ω) | RDC 3 (Ω) | Mount | Samples |
|---|