1
Description
LTC4279
Single Port PoE/PoE+/LTPoE++
PSE Controller
Demonstration circuit 2541A features the
,
an autonomous single port Power Sourcing Equipment
(PSE) controller for use in IEEE 802.3at Type 1, Type
2 and LTPoE++
®
compliant Power over Ethernet (PoE)
systems. The LTC4279 simplifies IEEE and LTPoE++ PSE
implementation, requiring only a 45-57V supply and a
small number of passive support components.
The DC2541A provides jumper selections for setting the
LTC4279 power mode, LEGACY pin, DUALPD pin, and
L
, LT, LTC, LTM, Linear Technology, LTPoE++ and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
MID pin, as well as the PSE output 2-pair or 4-pair mode.
A pushbutton switch resets the LTC4279. LEDs indicate
main supply power and output power are up. The Data-In
RJ45 connects to a PHY data source and the Data-and-
Power-Out RJ45 connects to a PD.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2541A
Figure 1. DC2541A Connection Diagram
DC2541 F01
DATA AND POWER
OUT TO PD
MAIN
PS
DATA IN
FROM PHY
+–
RJ45
RJ45
