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reference designLT4276 | Demoboard DC2262A-A

Analog Devices LT4276 | Demoboard DC2262A-A

LT4276, LT4321 PoE with Synchronous Forward and Ideal Diode Bridge

Overview

TopologyForward Converter
Input voltage37-57 V
Output 15 V / 13 A
IC revisionF

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-A supplies a 5V output at up to 13A. Italso demonstrates the use of an optional auxiliary powersupply input of 48V. When present, the auxiliary supplytakes priority over the PoE power path.

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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.
Version
VIN
VOut1(V)
IOut1(A)
Vaux(V)
n
Size
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 
VersionSMT 
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Size7050 
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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
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 
VersionSMD 
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SizeSH 
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
–Check availability
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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Turns Ratio1:1 
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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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750313095
SPECWE-PoE++ Power over Ethernet Plus Plus Transformer, –, –
Simu­lation–
Availability
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Downloads10 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PoE++ Power over Ethernet Plus Plus Transformer
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VersionForward 
Input Voltage 40 - 57 V (DC)
Output Voltage 15 V
Output Current 117 A
Auxiliary Voltage10.75 V
Turns Ratio3.5:1:2.25 
SizeEFD20 
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Insulation Test Voltage2400 V (AC)
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Length23.11 mm
Width29.08 mm
Height11.43 mm
MountSMT 
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Operating Temperature -40 °C up to +125 °C
Inductance175 µH
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