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DC2093A-B

Description
dev board for lt4275b/lt4321
CategoryDevelopment board/suite/development tools   
File Size620KB,18 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance  
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DC2093A-B Overview

dev board for lt4275b/lt4321

DEMO MANUAL DC2093A
LT4275/LT4321
LTPoE++/IEEE 802.3at/
IEEE 802.3af Compliant
Powered Device Interface
Many of the main features from the previous generation
PD controller are included in the LT4275 PD controller.
These include a power good indicator, a power sourcing
equipment (PSE) type indicator, and support for an auxil-
iary power input. The major difference from the previous
generation PD controller is that the LT4275 drives an
external N-channel Hot Swap™ FET at the PoE high side
voltage rail. This allows the user to choose a low R
DS(ON)
N-channel MOSFET to maximize power efficiency, reduce
heat dissipation, and ease thermal design. An LED status
indicator is included to indicate that the Hot Swap FET is
fully turned on and the PSE is powering the PD. A suf-
ficient load to sink more than 10mA is also included to
assure the PSE maintains power to the PD and to meet
the DC maintain power signature current required by the
IEEE 802.3at/IEEE 802.3af specification.
Simply connect the output of the DC2093A to the DC/DC
converter that is right for the application. Linear Technology
offers a variety of DC/DC converter solutions that can be
used with the DC2093A (eg DC894, DC1317, etc).
Design files for this circuit board are available at
http://www.linear.com/demo
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
LTPoE++ and Hot Swap are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
Description
Demonstration circuit 2093A features the
LT
®
4275,
a
fourth generation powered device (PD) controller and the
LT4321, an ideal diode bridge controller for Power over
Ethernet (PoE) applications.
The DC2093A is available in DC2093A-A, DC2093A-B, and
DC2093A-C versions to meet the power level required by
the PD application. The DC2093A-A features the LT4275A
PD controller. This controller supports the IEEE 802.3at
(Type 2, PoE+), IEEE 802.3af (Type 1, PoE) and LTPoE++™
specifications. LTPoE++ adds four power levels to the
existing IEEE standard with 38.7W, 52.7W, 70W, and 90W
of delivered PD power at the RJ45 jack. The DC2093A-B
features the LT4275B PD controller and is compliant with
the IEEE 802.3at and IEEE 802.3af specifications. The
DC2093A-C features the LT4275C PD controller and is
compliant with the IEEE 802.3af specification.
All three assemblies of the DC2093A include a PoE ideal
diode bridge controller, LT4321, and eight N-channel FETs
to reduce heat, maximize power efficiency, and increase
delivered power compared to a conventional diode bridge
rectifier. This controller is designed to be used in PoE ap-
plications without corrupting the PD’s signature resistance
during detection and prevent reverse current during a short
at the Ethernet cable.
Table 1. Summary of Features Supported by the DC2093A Assemblies
ASSEMBLY
DC2093A-A
PoE STANDARD
LTPoE++
PoE+
PoE
PoE+
PoE
PoE
MAXIMUM POWER
LEVEL
90W
POWER GOOD
INDICATOR (PWRGD)
Yes
PSE TYPE INDICATOR
(T2P)
Yes
AUXILIARY SUPPLY
SUPPORT
No
DC2093A-B
DC2093A-C
25.5W
13W
Yes
Yes
Yes
No
Yes
Yes
dc2093af
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