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reference designLT4276 | Demoboard DC2262A-B

Analog Devices LT4276 | Demoboard DC2262A-B

LT4276, LT4321 PoE with Synchronous Forward and Ideal Diode Bridge

Overview

TopologyForward Converter
Input voltage37-57 V
Output 112 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.

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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.
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.

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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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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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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.

Simu­lation
Availability
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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 
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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