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

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.