DC1351B

DC1351B demonstration circuit is a high-power supply featuring the LTC®4269IDKD-2. This board acts as an IEEE 802.3at compliant, high power, power-over-Ethernet (PoE), Powered Device (PD) and connects at the RJ45 to a compatible high power, power Sourcing Equipment (PSE) device, such as the DC1366A. The LTC4269IDKD-2 provides IEEE802.3at standard (PoE+) PD interfacing and power supply control. When the PD is fully powered, the PD interface switches power over from the PSE to the switcher through an internal, low resistance, high power MOSFET. The highly integrated LTC4269IDKD-2 controls a high power, small-sized power supply that utilizes a highly-efficient isolated forward topology with synchronous rectification. The DC1351B supplies a 5V output at up to 5A. DC1351B also demonstrates the use of an auxiliary 48V wall adapter. When present, the auxiliary supply becomes the dominant supply over PoE to provide power.

• Port voltage (VPORT) range from 37V to 57V, auxiliary voltage (VAUX) range from 44V to 57V
• Output Voltage (VOUT) initial set-point of 5.05V (VPORT = 37V to 57V, IOUT = 0A to 5A )
• Maximum output current of 4.6A (min)(VPORT = 42V )
• Typical output voltage ripple of 40mVP–P (typ) (VIN = 50V, IOUT = 4.6A)
• Efficiency of 92.5% (typ) (VPORT = 42V, IOUT = 5A, not incl. diode bridge)