DC1561B

DC1561B demonstration circuit is an Ethernet Alliance™ certified PoE powered device (PD), featuring the LTC®4278. The DC1561B also features a wide auxiliary input voltage range of 9V to 57V. The demonstration board can connect to a Type 2 Power Sourcing Equipment (PSE) device, such as the DC1567. This board is a Type 2 (IEEE 802.3at) compliant, high power PoE, Powered Device (PD). The DC1561B also features a wide auxiliary input voltage range of 9V to 57V. 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 5V at 4.5A.

• Demonstrates use of an auxiliary wall adapter for nominal 12V DC, 24V AC/24V DC, or 48V DC systems
• 250kHz (typ) switching frequency
• 89% (typ) efficiency (VAUX = 24V, IOUT = 4.5A (includes diode D12))