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Table of Contents
Description
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
+
MAIN
–
PS
DEMO MANUAL DC2541A
Single Port PoE/PoE+/LTPoE ++
LTC
4279,
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
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.
Figure 1. DC2541A Connection Diagram
LTC4279
PSE Controller
DATA AND POWER
RJ45
OUT TO PD
DATA IN
RJ45
FROM PHY
DC2541 F01
dc2541af
1
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Table of Contents
Related Manuals for Linear Technology DC2541A
Summary of Contents for Linear Technology DC2541A
- Page 1 The DC2541A provides jumper selections for setting the L, LT, LTC, LTM, Linear Technology, LTPoE ++ and the Linear logo are registered trademarks of LTC4279 power mode, LEGACY pin, DUALPD pin, and Linear Technology Corporation. All other trademarks are the property of their respective owners.
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Page 2: Quick Start Procedure
DEMO MANUAL DC2541A Quick start proceDure Demonstration circuit 2541A is easy to set up for evaluat- 4) Connect test measurement probes across VPORT+ ing the performance of the LTC4279. Refer to Figure 1 for and VPORT– for 2-pair measurements, and optionally... -
Page 3: Operation
Power Supply Range The primary function of the LTC4279 is to control the de- The power supply voltage to the DC2541A must be set to livery of power to the PSE port. It does this by controlling meet the requirements of the PSE Type as listed in Table 1. - Page 4 Logic Pin Protection released. When the RESET pin is logic low, the LTC4279 The DC2541A has a 100Ω resistor (R6, R7 and R8) in is held inactive with the port off. When the RESET pin is series from each of the LTC4279 logic pins (MID, DUALPD...
- Page 5 Proper connection of the port current sense lines is impor- tant for current threshold accuracy and IEEE compliance. On the DC2541A, the LTC4279 VSSK pin is connected to a Kelvin sense trace that leads to the sense resistor pad as shown in Figure 2 and is not connected directly to VEE copper areas.
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Page 6: Pcb Layout
DEMO MANUAL DC2541A pcB Layout Top Assembly Top Layer dc2541af... - Page 7 DEMO MANUAL DC2541A Inner Layer 2 Inner Layer 3 dc2541af...
- Page 8 DEMO MANUAL DC2541A Bottom Layer Bottom Assembly dc2541af...
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Page 9: Schematic Diagram
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. - Page 10 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.
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