DC1561B: POE, 5V @ 4.5A, 9 ~ 57V in

Summary

Demonstration circuit 1561B is a high power supply, featuring the LTCR4278. This board is a Type 2 (IEEE 802.3at) compliant, high power Power over Ethernet (PoE), Powered Device (PD). The DC1561B also features a wide auxiliary input voltage range of 9 V to 57 V. The demonstration board can connect to a Type 2 Power Sourcing Equipment (PSE) device, such as the DC1567.

The LTC4278 provides IEEE 802.3at standard (PoE+) PD interfacing and power supply control. When the PD fully powers, the PD interface passes power from the PSE to the switcher through an internal, low resistance, high power MOSFET. The highly integrated LTC4278 controls a high power, small power supply that utilizes a highly-efficient isolated flyback topology with synchronous rectification.

The DC1561B outputs 5 V at 4.5 A.

DC1561B also demonstrates the use of an auxiliary wall adapter for nominal 12 VDC, 24 VAC/24 VDC, or 48 VDC systems. When present, the auxiliary supply is the dominant supply over PoE to provide power.

Specifications

Manufacturer	Analog Devices Inc.
Category	Power Management
Sub-Category	POE - Power Over Ethernet
Eval Board Part Number	DC1561B-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
Topology	Flyback
Outputs and Type	1 Isolated
Voltage Out	5 V
Current Out	4.5 A
Voltage In	9 ~ 57 V
Efficiency @ Conditions	>86%, 24 Vaux, 5 V @1.5 - 4.5 A >85%, 57 Vaux, 5 V @ 2.7 - 4.5 A >84%, 9 Vaux, 5 V @1.5 - 3.4 A >84%, 42 Vaux, 5 V @1.8 - 4.5 A
Features	Current Limit (Adj. or Fixed) Ethernet Connection Over Voltage Protection Power Good Output Short Circuit Protection Shutdown, Enable, Standby Soft Start Thermal Protection Under Voltage Protection, Brown-Out
Switching Frequency	100 kHz
Component Count + Extras	59 + 46
Design Author	Linear Technology
Internal Switch	Yes
Main I.C. Base Part	LTC4278
Application / Target Market	Remote Controls Security IP Camera VOIP Phones Wireless Sensor WLAN Access Points
Date Created By Author	2012-02
Date Added To Library	2013-03