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Analog Devices LT4276 | Demoboard DC2262A-B
LT4276, LT4321 PoE with Synchronous Forward and Ideal Diode Bridge
Overview
| Topology | Forward Converter |
| Input voltage | 37-57 V |
| Output 1 | 12 V / 7 A |
Description
Demonstration circuit 2262 is a PoE Powered Device (PD)with a synchronous forward isolated power supply featuringthe LT®4276 and an ideal diode bridge 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 connected toa PSE, the LT4276 turns on an external, low-resistance,high-power N-channel Hot Swap™ FET. The LT4276 controlsa high-power, small-sized power supply that utilizesa highly efficient, synchronously rectified, active clamp forward topology. The LT4321 provides further efficiencyimprovement by minimizing bridge losses.The DC2262A-B supplies a 12V output at up to 7A. Italso demonstrates the use of an optional auxiliary powersupply input of 48V. When present, the auxiliary supplytakes priority over the PoE power path.
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Product series | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | IR (A) | L1 (mH) | RDC max. (Ω) | VR (V (AC)) | VT (V (RMS)) | Material | L (mm) | W (mm) | H (mm) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 744314490 | SPEC | 8 files | WE-HCI SMT Flat Wire High Current Inductor | 4.9 | 8.3 | 2.2 | 6.5 | 14.5 | 56 | – | – | – | – | – | Superflux | 7 | 6.9 | 4.8 | SMT | ||
 | 749022016 | SPEC | – | 10/100/1000 Base-T SMT Transformer | 350 | – | – | – | – | – | – | – | – | – | 1500 | – | 18.16 | 16 | 10.16 | SMT | ||
 | 7446632002 | SPEC | 8 files | WE-LF SMT Common Mode Power Line Choke | 2200 | – | – | – | – | – | 2.75 | 2.2 | 0.1 | 250 | 1500 | MnZn | 23.3 | 18.5 | 11.5 | – |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 744314490 | SPEC | |
| 749022016 | SPEC | |
| 7446632002 | SPEC |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Product series | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC (mΩ) | fres (MHz) | IR (A) | L1 (mH) | RDC max. (Ω) | VR (V (AC)) | VT (V (RMS)) | Material | L (mm) | W (mm) | H (mm) | Mount | Samples |
|---|