DC1366A Linear Technology, DC1366A Datasheet

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DC1366A

Manufacturer Part Number
DC1366A
Description
Demo Board for LTC4266CGW
Manufacturer
Linear Technology
Datasheet
DESCRIPTION
Demonstration
LTC
I
compliant Power Sourcing Equipment (PSE).
grated into a tiny 5mm×7mm 38-pin QFN package are
four independent ports controlling external N-channel
power MOSFETs. Each port features:
The DC1366A board is configured like a midspan
PSE with two RJ45 connectors for each port such
that gigabit Ethernet data can pass through the
board at full line rates while dc power is injected by
the LTC4266 on the PD side of the board.
QUICK START PROCEDURE
Figure 1 shows the basic setup. The LTC4266 requires
two power supply rails: V
(nominally -54V). The V
the DC590B board or an external bench supply.
When running the GUI application on a Windows
computer, the DC590B board from Linear Tech is
used to interface a USB port on the PC to the I
on the DC1366A board. The DC590B also provides
optoisolation of the I
supply to run the LTC4266 chip; the user need only
provide the V
2
C™ interface, designed for use in IEEE 802.3at™-
®
■ Reliable 4-point PD detection
■ Selectable 1 or 2-event classification
■ Inrush current limiting
■ Extremely fast short-circuit protection with
■ Programmable cutoff current threshold for
■ Voltage and current readback
■ DC disconnect sensing
4266CUHF, a quad network power controller with
programmable foldback current threshold
class power enforcement
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1366A
IEEE802.3AF/AT POWER-OVER-ETHERNET POWER SOURCING EQUIPMENT CONTROLLER
EE
supply.
circuit
2
C bus, and an isolated 3.3V
DD
DD
DC1366A
supply can be provided by
(nominally 3.3V) and V
features
2
C bus
Inte-
the
EE
Often one of the most challenging aspects of de-
signing a PSE system is the power management
software; Linear Technology makes the job easier
with the fully-featured LTC4266 register set and an
advanced GUI software application. The GUI allows
the user full and easy access to the LTC4266 regis-
ter set with detailed contextual help info. The GUI
also includes a host computer emulator to demon-
strate basic power management techniques: the
user selects various system parameters such as PSE
type (endspan or midspan), 1 or 2-event classifica-
tion, total system power budget, and fault handling
rules; then with the click of a button the host com-
puter emulator takes control of the system, manag-
ing the power budget as PDs are connected and dis-
connected, and logging all events.
The DC1366A demo boards, CAD files, and GUI soft-
ware are available only under a non-disclosure
agreement (NDA). Contact your local Linear Tech-
nology sales person or field applications engineer.
L, LT, LTC, and QuickEval are trademarks of Linear Technology
Corporation; I 2 C is a trademark of Phillips Electronics N.V.; all other
trademarks are the property of their respective owners.
Alternatively, the user can omit the DC590B and
connect some other I
DC1366A board. If the DC590B is omitted then a
bench power supply must provide V
For applications where power management is not
required, the LTC4266 features an AUTO mode al-
lowing it to operate completely autonomously.
Choose one of the setup procedures shown on the next
page, depending on whether or not the GUI application
software is required.
2
C master device to the
DD
.
LTC4266
1

Related parts for DC1366A

DC1366A Summary of contents

Page 1

... Alternatively, the user can omit the DC590B and connect some other I EE DC1366A board. If the DC590B is omitted then a bench power supply must provide V For applications where power management is not required, the LTC4266 features an AUTO mode al- ...

Page 2

... VEE. 8. Turn on the main power supply and verify the VEE LED on the DC1366A board is lit. 9. Connect PDs to any of the ports on the DC1366A board and verify they turn on. 10. Launch the GUI application. Refer to the GUI us- ers’ manual for instructions. ...

Page 3

... QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1366A IEEE802.3AF/AT POWER-OVER-ETHERNET POWER SOURCING EQUIPMENT CONTROLLER Figure 1. DC1366A Board Setup. LTC4266 3 ...

Page 4

... LTC4266 is capable of operating over the range of 3.0V to 4.3V. (The UVLO threshold for the V ply is typically 2.2V.) The LTC4266 chip typically draws only 1.1mA from the V LEDs and other components on the DC1366A board also draw current from the total load is typi- DD cally 9mA to 26mA @ 3.3V depending on which LEDs are lit ...

Page 5

... The 7-bit I C address of the LTC4266 is 010A where A through pins AD3 through AD0 respectively. DC1366A board these pins are controlled by the quad DIP switch, S1. The LTC4266 has internal LTC4266 supply be- EE are determined 0 On the 5 ...

Page 6

... TP9. An LED is also included for conven- ience. Connecting Multiple DC1366A Boards To use multiple DC1366A boards on a common I bus, simply connect their J6 connectors together with ribbon cable (14-conductor, 1mm pitch sixteen DC1366A boards can be controlled single I C master. Remember to set each board different I C address using the DIP switch. The DC590B can’ ...

Page 7

... SD1 A1 DRAWN mi 11/12/07 A1 TITLE A0 SCH, LTC4266CUHF, IEEE802.3AT PoE QUAD PSE A0 CHECKED APPROVED CONTROLLER ENGINEER DR SIZE CAGE CODE DWG NO DESIGNER DC1366A Custom Friday , January 30, 2009 SCALE: FILENAME: 1366a-5.dsn DATE APPROVED 12/08/08 VDD VDD Q12 Si2343DS R24 300 D15 OUT4 GRN TP10 GND ...

Page 8

... CONTRACT NO. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 APPROVALS DATE TECHNOLOGY Fax: (408)434-0507 DRAWN mi 11/12/07 TITLE SCH, LTC4266CUHF, IEEE802.3AT PoE QUAD PSE CHECKED APPROVED CONTROLLER ENGINEER SIZE CAGE CODE DWG NO REV DESIGNER DC1366A 5 Friday, January 30, 2009 SCALE: FILENAME: 1366a-5.dsn SHEET ...

Page 9

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1366A IEEE802.3AF/AT POWER-OVER-ETHERNET POWER SOURCING EQUIPMENT CONTROLLER ITEM QTY REF DES C65 C16 4 8 C17, C19, C28, C34, C40, C42, C49, C53 5 8 C20, ...

Page 10

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1366A IEEE802.3AF/AT POWER-OVER-ETHERNET POWER SOURCING EQUIPMENT CONTROLLER ITEM QTY REF DES 35 18 TP1-TP10, TP14-TP19 TP32 37 4 T1, T2, T3 ...

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