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reference designLT4295 | Demoboard DC2476A

Analog Devices LT4295 | Demoboard DC2476A

High Efficiency IEEE 802.3bt (PoE++, Type 4, 62W/71W) PD with Flyback DC/DC Converter and Auxiliary Supply Input

Overview

TopologyBuck Converter
Input voltage37-57 V
Output 124 V / 2.7 A
IC revision1

Description

Demonstration Circuit 2476A is an IEEE 802.3bt (Draft 2.2) compliant power over ethernet (PoE) powered device (PD). It features the LT®4295 PD interface and switching regulator controller and the LT4321 PoE ideal diode bridge controller.The LT4295 provides IEEE 802.3af (PoE, Type 1), IEEE802.3at (PoE+, Type 2), and IEEE 802.3bt (PoE++, Type 3and 4) compliant interfacing and power supply control. Itutilizes an external, low RDS(on) (30mΩ 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.

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Data­sheet
Simu­lation
Downloads
Status
Product series
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Material
Qty.
Data rate
Ports
PoE
Improved CMRR
Operating Temperature
VT(V (RMS))
Mount
L(µH)
SamplesAvailability & Sample
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744316470
SPECWE-HCI SMT Flat Wire High Current Inductor, 6 A, 2.5 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 Current6 A
Saturation Current @ 10%2.5 A
Saturation Current @ 30%4.7 A
DC Resistance24.5 mΩ
Self Resonant Frequency57 MHz
MaterialSuperflux 
Packaging Unit1500 
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Operating Temperature -40 °C up to +150 °C
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MountSMT 
Inductance4.7 µH
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744316100
SPECWE-HCI SMT Flat Wire High Current Inductor, 14.8 A, 5.5 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 Current14.8 A
Saturation Current @ 10%5.5 A
Saturation Current @ 30%11.5 A
DC Resistance4.75 mΩ
Self Resonant Frequency158 MHz
MaterialSuperflux 
Packaging Unit1500 
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Operating Temperature -40 °C up to +150 °C
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MountSMT 
Inductance1 µH
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749022016
SPECWE-LAN LAN Transformer, –, –
Simu­lation
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Downloads4 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-LAN LAN Transformer
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Data rate1000BASE-T 
Ports1 
PoEPoE+ (up to 1150 mA) 
Improved Common Mode RejectionNo 
Operating Temperature 0 °C up to +70 °C
Insulation Test Voltage1500 V (RMS)
MountSMT 
Inductance350 µH
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750316231
SPECFlyback Transformer, –, –
Simu­lation–
Availability
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Downloads–
Status Activei| Production is active. Expected lifetime: >10 years.
Product series Flyback Transformer
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