DC1335B-C: 12V @ 2A POE, 37 ~ 57V in

Summary

Demonstration circuit 1335B-C 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 DC1335B-C supplies a 12V output at up to 2A.

DC1335B-C also demonstrates the use of an auxiliary 48V wall adapter. When present, the auxiliary supply becomes 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	DC1335B-C-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
Compliance	IEEE 802.3at Type 2
Outputs and Type	1 Isolated
Voltage Out	12 V
Current Out	2 A
Voltage In	37 ~ 57 V
Efficiency @ Conditions	>89%, 57V in, 12 V ~ 1.0 ~ 2.0 A >89%, 50V in, 12V @ 0.8 ~ 2.0 A >89%, 42V in, 12V @ 0.7 ~ 2.0 A
Internal Switch	Yes
Features	Over Voltage Protection Power Good Output Short Circuit Protection Shutdown, Enable, Standby Soft Start Thermal Protection Under Voltage Protection, Brown-Out
Switching Frequency	250 kHz
Component Count + Extras	62 + 22
Application / Target Market	Factory Automation PoE, Power Over Ethernet RF / Wireless RF: WLAN Access Points Security IP Camera VOIP Phones
Design Author	Linear Technology
Main I.C. Base Part	LTC4269
Date Created By Author	2010-03
Date Added To Library	2013-12