DC1335A-A: 3.3V @ 6.6A POE, 37 ~ 57V in

Demonstration circuit 1335A-A is a high-power supply featuring the LTC®4269IDKD-1. 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 DC1366.

The LTC4269IDKD-1 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-1 controls a high-power, small-sized power supply that utilizes a highly-efficient isolated flyback topology with synchronous rectification. The DC1335A-A supplies a 3.3V output at up to 7A.

DC1335A-A also demonstrates the use of an auxiliary 48V wall adapter. When present, the auxiliary supply becomes the dominant supply over PoE to provide power.