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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

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction 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
–Check availability
74439369082
SPECWE-XHMI SMT Power Inductor, 13.4 A, 9.4 A
Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction 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, –, –
Simu­lation
Availability
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Downloads11 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction 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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Downloads7 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction 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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