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Overview
| Topology | Flyback Converter |
| Input voltage | 37-57 V |
| Output 1 | 3.3 V / 6.8 A |
Description
Demonstration circuit 2046A-A is a PoE powered device(PD) with an isolated power supply using synchronousflyback topology, featuring the LT®4276 and ideal diodebridge controller (LT4321).The LT4276 provides IEEE802.3af (PoE, Type 1),IEEE802.3at (PoE+, Type 2), and LTPoE++™ PD interfacingand power supply control. When the PD is fully powered,the PD interface switches power over from the powersourcing equipment (PSE) to the switcher through anexternal, low resistance, high power N-channel FET. Thehighly integrated LT4276 controls a high power, smallsizedpower supply that utilizes a highly efficient flybacktopology with synchronous rectification. The LT4321provides further efficiency improvement by minimizingthe bridge losses.The DC2046A-A supplies a 3.3V output at up to 6.8A. Italso demonstrates the use of an optional auxiliary powersupply input of 48V. When present, the auxiliary supplybecomes the dominant supply over PoE to provide power.
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Product series | 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 | Vaux (V) | RDC 1 (mΩ) | RDC 2 (mΩ) | RDC 3 (mΩ) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 744272332 | SPEC | 8 files | WE-SL5 SMT Common Mode Line Filter | bifilar | 2 | 3300 | 8900 | 650 | 0.36 | 80 | SMT | – | – | – | 3300 | – | 1000 | – | – | – | – | – | SMT | ||
 | 750310743 | SPEC | – | 9 files | WE-PoE+ Power over Ethernet Plus Transformer | – | – | 38 | – | – | – | – | CCM Flyback | 37 - 57 V (DC) | 3.3 | 7.5 | 38 | 6.67:1:4 | 1500 | EP13 | 12.7 | 100 | 3 | 182 | SMT | |
 | 749022016 | SPEC | – | 10/100/1000 Base-T SMT Transformer | – | – | – | – | – | – | – | – | – | – | – | 350 | – | 1500 | – | – | – | – | – | SMT |
| Samples |
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| Order Code | Datasheet | Simulation | Downloads | Product series | 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 | Vaux (V) | RDC 1 (mΩ) | RDC 2 (mΩ) | RDC 3 (mΩ) | Mount | Samples |
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