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reference designLT4295 | Demoboard DC2584A / DC2584A-A

Analog Devices LT4295 | Demoboard DC2584A / DC2584A-A

High Efficiency IEEE 802.3bt (PoE++, Type 4, 71W) PD with Forward DC/DC Converter

Overview

TopologyBuck Converter
Input voltage37-57 V
Output 112 V / 5.5 A
IC revision1

Description

Demonstration circuit 2584A is an IEEE 802.3bt (Draft2.1) compliant Power over Ethernet (PoE) PoweredDevice (PD). It features the LT®4295 PD interface andswitching regulator controller and the LT4321 PoE idealdiode bridge controller.The LT4295 provides IEEE  802.3af (PoE, Type 1),IEEE 802.3at (PoE+, Type 2), and IEEE 802.3bt (PoE++,Type 3 and 4) compliant interfacing and power supplycontrol. It utilizes an external, low RDS(on) (30mΩ typical)N-channel FET for the hot swap function to improveefficiency. The LT4295 controls a DC/DC converter thatutilizes a highly efficient active-clamp forward convertertopology with synchronous rectification.The LT4321 controls eight low RDS(on) (30mΩ 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 passivePoE rectifier bridge.The DC2584A-A accepts up to 71W of delivered powerfrom a Power Sourcing Equipment (PSE) via the RJ45connector (J1) or a local 48V DC power supply using theauxiliary supply input. When both supplies are connected,the auxiliary supply input has priority over the PoE input.The DC2584A-A supplies a 12V output at up to 5.5A

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Qty.
RDC typ.(mΩ)
RDC max.(mΩ)
IR(A)
L1(mH)
RDC max.(Ω)
VR(V (AC))
VT(V (AC))
Material
L(mm)
W(mm)
H(mm)
Mount
Data rate
Ports
PoE
Improved CMRR
Operating Temperature
L(µH)
SamplesAvailability & Sample
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744314490
SPECWE-HCI SMT Flat Wire High Current Inductor, 8.3 A, 2.2 A
Simu­lation
Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Performance Rated Current8.3 A
Saturation Current @ 10%2.2 A
Saturation Current @ 30%6.5 A
DC Resistance14.5 mΩ
Self Resonant Frequency56 MHz
Packaging Unit1000 
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DC Resistance15.95 mΩ
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MaterialSuperflux 
Length7 mm
Width6.9 mm
Height4.8 mm
MountSMT 
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Operating Temperature -40 °C up to +150 °C
Inductance4.9 µH
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74439369082
SPECWE-XHMI SMT Power Inductor, 13.4 A, 9.4 A
Simu­lation
Availability
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Downloads9 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-XHMI SMT Power Inductor
Performance Rated Current13.4 A
Saturation Current @ 10%9.4 A
Saturation Current @ 30%20.45 A
DC Resistance10 mΩ
Self Resonant Frequency16 MHz
Packaging Unit300 
DC Resistance10 mΩ
DC Resistance11 mΩ
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Length11.6 mm
Width10.5 mm
Height8.8 mm
MountSMT 
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Operating Temperature -40 °C up to +125 °C
Inductance8.2 µH
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7446632002
SPECWE-LF SMD Common Mode Power Line Choke in SMT, –, –

PCN pending

Due 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.

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Downloads11 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-LF SMD Common Mode Power Line Choke in SMT
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Packaging Unit200 
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DC Resistance100 mΩ
Rated Current2.75 A
Inductance [1]2.2 mH
DC Resistance [1]0.1 Ω
Rated Voltage250 V (AC)
Insulation Test Voltage1500 V (AC)
MaterialMnZn 
Length23.3 mm
Width18.5 mm
Height11.5 mm
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Operating Temperature -40 °C up to +125 °C
Inductance2200 µH
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749022016
SPECWE-LAN LAN Transformer, –, –
Simu­lation
Availability
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Downloads4 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-LAN LAN Transformer
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Insulation Test Voltage1500 V (AC)
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Length18.16 mm
Width16 mm
Height10.16 mm
MountSMT 
Data rate1000BASE-T 
Ports1 
PoEPoE+ (up to 1150 mA) 
Improved Common Mode RejectionNo 
Operating Temperature 0 °C up to +70 °C
Inductance350 µH
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