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DC1567A

Description
eval board for ltc4274
CategoryDevelopment board/suite/development tools   
File Size265KB,12 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance  
Download Datasheet View All

DC1567A Overview

eval board for ltc4274

DEMO MANUAL DC1567A
LTC4274: Single Port
IEEE802.3at PSE
DESCRIPTION
Demonstration circuit 1567A features the LTC4274, a single
power sourcing equipment (PSE) controller designed for
use in IEEE 802.3 Type 1 and Type 2 (high power) compli-
ant Power over Ethernet (PoE) systems. The LTC4274 is
configured in the DC1567A as a midspan power injector
where data comes in from an existing network system
and out, along with power, to a powered device (PD). The
LTC4274 autonomously detects a PD, turns power on to
the port, and disconnects port power without the need for a
microcontroller. A 2-event classification and a two second
backoff timer support the midspan configuration.
Only a single 55V supply is required to power the DC1567A.
A simple 3-component regulator circuit on the board pow-
ers the digital supply of the LTC4274.
The LTC4274 delivers lowest-in-industry heat dissipation
by utilizing a low R
ON
external MOSFET and a 0.25Ω sense
resistor, eliminating the need for expensive heat sinks.
An external MOSFET also provide a more robust solution
compared to an integrated MOSFET.
Power controlled by the LTC4274 is connected to the center
taps on the cable side of the Ethernet transformers for data
pairs 4/5 and 7/8. An integrated RJ45 connector includes
the Ethernet transformer, common mode termination, and
LEDs. One LED is also controlled by the LTC4274 to indicate
the port is powered. Test turrets provide test points for
port power measurements.
Design files for this circuit board are available at www.
linear.com/demo.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
DC1567 FO1
Figure 1. DC1567A
dc1567af
1
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