DC1366B - Demo Manual

DEMO MANUAL DC1366B
LTC4266
IEEE 802.3at PoE
Quad PSE Controller
Description
Demonstration circuit DC1366B features the LTC®4266, a
quad network power controller with I2C® interface, designed
for use in IEEE 802.3at compliant Power Sourcing Equipment (PSE). Integrated into a tiny 5mm × 7mm 38-pin
QFN package are four independent channels controlling
external N-channel power MOSFETs. Each port features:
Reliable 4-Point PD Detection
n
Selectable 1 or 2-Event Classification
n
Inrush Current Limiting
n
Extremely Fast Short-Circuit Protection with Programmable Foldback Current Threshold
n
Programmable Cutoff Current Threshold for Class
Power Enforcement
n
Voltage and Current Readback
n
DC Disconnect Sensing
n
The DC1366B 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 OUT TO PD
side of the board.
Often one of the most challenging aspects of designing a
PSE system is the power management software; Linear
Technology makes the job easier with the fully-featured
LTC4266 register set and a QuikEval™ GUI software application. The GUI allows the user full and easy access to
the LTC4266 register set with detailed contextual help info.
LTC4266 example software is available only under a nondisclosure agreement (NDA).
The DC1366B has increased surge protection and more
compact Hot Swap MOSFETs over the DC1366A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1366B
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
DC1366B
dc1366bfa
1
DEMO MANUAL DC1366B
Quick Start Procedure
Figure 1 shows the basic setup. The LTC4266 requires
two power supply rails: VDD (nominally 3.3V) and VEE
(nominally –54V). The VDD supply can be provided by a
DC590 board or an external bench supply.
When running QuikEval on a Windows computer, the
DC590 is used to interface a USB port on the PC to the
I2C bus on the DC1366B. The DC590 also provides optoisolation of the I2C bus, and an isolated 3.3V supply to run
the LTC4266; the user need only provide the VEE supply.
Alternatively, the user can omit the DC590 and connect an
I2C master device to the DC1366B. If the DC590 is omitted
then a bench power supply must provide VDD.
I2C
control is not required, the
For applications where
LTC4266 features an AUTO mode allowing it to operate
completely autonomously.
Choose one of the setup procedures shown on the next
page, depending on whether or not the QuikEval GUI application software is required.
Setup Procedure to Run the QuikEval GUI Software
1. Install the GUI software on the PC according to the
instructions in the README.txt file included with the
GUI software.
2. On the DC590:
a. Set both sides (ISO and SW) of JP5 to ON.
b.Set JP6 to 3.3V.
3. Connect the DC590 to the PC with a standard USB A-B
cable.
a. Verify the computer recognized the USB device.
(The first time the DC590 is connected the Hardware
Wizard may ask for help to locate the driver. Direct
it to the location specified in the README.txt that
came with the GUI software.)
b.Verify the ISO PWR LED on the DC590 is lit.
4. On the DC1366B board:
a. Set JP5 to the USB VDD position.
b.Set JP3 to the TIE position.
c. Set JP4 (AUTO) to the HI position.
d.If midspan operation is desired set JP2 to HI, for
endpoint set to LO.
5. Connect the DC590 to the DC1366B with the 14-conductor ribbon cable supplied with the DC1366B. Verify
the VDD LED on the DC1366B is lit.
6. Before connecting the main power supply to the
DC1366B verify the voltage is between 51V and 57V,
and that the main supply is turned off.
7. Connect the main power supply to the DC1366B with
two banana patch cords as shown in Figure 1. Verify
the polarity is correct before turning on the power;
positive goes to RTN and negative to VEE.
8. Turn on the main power supply and verify the VEE LED
on the DC1366B is lit.
9. Connect PDs to any of the ports on the OUT to PD
side of the DC1366B and verify they turn on by the
respective OUTn LED.
10.Launch QuikEval.
2
dc1366bfa
DEMO MANUAL DC1366B
Quick Start Procedure
Setup Procedure without the DC590
1. On the DC1366B:
a. Set JP5 to EXT VDD.
b.Set JP4 (AUTO) to the HI position.
c. If midspan operation is desired set JP2 to HI, for
endpoint set to LO.
2. Connect a 3.3V power supply across +3.3V and DGND
test points as shown in Figure 1. Turn on the 3.3V
supply and verify the VDD LED on the DC1366B is lit.
4. Connect the main power supply to the DC1366B with
two banana patch cords as shown in Figure 1. Verify
the polarity is correct before turning on the power;
positive goes to RTN and negative to VEE.
5. Turn on the main power supply and verify the VEE LED
on the DC1366B is lit.
6. Connect PDs to any of the ports on the OUT TO PD
side of the DC1366B and verify they turn on by the
respective OUTn LED.
3. Before connecting the main power supply to the
DC1366B verify the voltage is between 51V and 57V,
and that the main supply is turned off.
dc1366bfa
3
DEMO MANUAL DC1366B
Quick Start Procedure
Optional Equipment for Computer Control
DC590
USB to I2C
Interface
USB CABLE
Windows
Computer
14-Pin Ribbon Cable
CAT5
Cables
Isolated
VEE Supply
(51V to 57V)
–+
+–
RJ45
RJ45
PD1
RJ45
RJ45
PD2
RJ45
RJ45
PD3
RJ45
RJ45
PD4
Optional
VDD Supply
(3.3V Nominal)
Figure 1. DC1366B Setup
4
dc1366bfa
DEMO MANUAL DC1366B
Operation
Introduction
Modes of Operation
The DC1366B demonstrates the features and capabilities
of the LTC4266, a quad controller for IEEE802.3at Power
Sourcing Equipment (PSE). The DC1366B provides a quick
and simple, fully compliant PSE solution requiring only
a VEE supply when used in conjunction with the DC590
USB-to-I2C interface board.
The LTC4266 has four modes of operation:
Supply Voltages
The IEEE802.3at standard requires the port output voltage of a type 2 PSE to be in the range of 50V to 57V. The
positive side is RTN and the negative side is VEE. The VEE
supply voltage should be in this range for the sake of
compliance; however, the LTC4266 is capable of operating with VEE down to 30V, the max undervoltage lockout
(UVLO) threshold.
Make sure to choose a VEE supply with enough power to
sustain all four ports at maximum load; if the total load is
too great for the power supply its voltage may drop below
the UVLO threshold, resetting the LTC4266 and shutting
off all the ports. The worst case is when all four PDs are
class 4: each class 4 PD may draw up to 600mA, totaling
2.4A. Therefore a VEE supply rated for at least 2.6A is
recommended.
The VDD supply should nominally be 3.3V but the LTC4266
is capable of operating over the range of 3.0V to 4.3V.
(The UVLO threshold for the VDD supply is typically 2.2V.)
The LTC4266 chip typically draws only 1.1mA from the
VDD supply; however, LEDs and other components on
the DC1366B board also draw current from VDD, so the
total load is typically 9mA to 26mA at 3.3V depending on
which LEDs are lit.
VDD to DGND Configurations
The DC1366B, LTC4266 VDD supply can be configured in
one of two ways. The default DC1366B configuration ties
the LTC4266 VDD pin to the AGND pin through a 0 Ohm
resistor R10. The DGND pin is at –3.3V below the AGND
pin. The DC1366B can also be configured for a +3.3V at
VDD relative to AGND by removing R10 and installing a
0Ω resistor at R9. This ties the LTC4266 DGND pin and
AGND pin.
Shutdown: Ports are shutdown, detection and classification cycles are disabled.
n
Manual: The port does not advance automatically from
detection to classification, to power on. It waits for
instructions from a host controller via the I2C interface.
n
Semiauto: The port automatically advances to classification after detecting a PD, but does not turn on
power to the PD until told to do so by from a host
controller via the I2C interface.
n
AUTO Pin High: The LTC4266 operates autonomously.
n
AUTO Pin
The AUTO pin determines several aspects of the LTC4266
initial behavior. AUTO is sensed by the LTC4266 at power
up and after a reset.
If the AUTO pin is high then:
All ports come up in AUTO pin high mode. Any valid
PD will be turned on without software intervention.
n
The current-sense resistors are assumed to be 0.25Ω
(which they are on the DC1366B).
n
High power is enabled. After the LTC4266 classifies a
PD it applies power and automatically sets ICUT and ILIM
appropriately for the class. With high-power enabled a
class 4 PD will be able to draw up to 600mA without
being cut off.
n
If the AUTO pin is low then:
All ports come up in shutdown mode. A host controller
must take action in order to power up any PDs.
n
The current-sense resistors are assumed to be 0.50Ω;
a host controller must change this to 0.25Ω for correct
operation of the DC1366B.
n
High power is disabled and is enabled by a host controller.
n
dc1366bfa
5
DEMO MANUAL DC1366B
Operation
Endpoint vs. Midspan
The LTC4266 can be configured either for endpoint or
midspan operation without software intervention by setting
the MID pin high or low respectively. (You must reset the
LTC4266 or cycle the power for the MID pin to be sensed.)
The only difference in the behavior of the LTC4266 is that
the detection back-off timer is enabled when midspan
operation is selected.
Each port can be configured individually as either endspan
or midspan via I2C commands.
The DC1366B is wired for Alternative-A, MDI-X (power is
injected on the data pairs of the CAT5/6e cable; positive
on pins 3 and 6 of the RJ45 connector, and negative on
pins 1 and 2). The original 802.3af standard required all
midspans to use Alternative-B, but 802.3at allows midspans
to use Alternative-A.
Disconnect Sensing
The LTC4266 employs DC disconnect sensing only. For
the sake of software backward compatibility with the older
LTC4259, the LTC4266 includes register bits for enabling
AC disconnect sensing, but these bits simply enable the
DC disconnect sensing.
Pushbutton Switches
The DC1366B includes several pushbutton switches to
facilitate experimentation with the LTC4266.
The RESET button (SW6) resets all ports just as if the
power supplies were cycled.
n
The Masked Shutdown (MSD) button (SW7) will turn
off any ports that have their corresponding mask bit
set in the MSD register.
n
Each port has an individual shut down switch (SW2
through SW5 for ports 1 through 4 respectively).
n
Masked Shutdown
The MSD register can be used to pre-assign low-priority
to selected ports so they can be shut down quickly when
needed.
6
A PSE system design can utilize the MSD feature in various
ways. For example, a PSE system may include a circuit
that monitors the VEE supply; if it becomes overloaded
and the voltage begins to sag, the system can dump lowpriority ports by asserting the MSD pin. Shedding excess
load quickly may allow the VEE voltage to recover before it
reaches the UVLO threshold, thus avoiding shutting down
higher-priority ports.
I2C Addressing
The 7-bit I2C address of the LTC4266 is 010A3A2A1A0b,
where A3 through A0 are determined by pins AD3 through
AD0 respectively. On the DC1366B these pins are controlled
by the quad DIP switch, SW1. The LTC4266 has internal
pull-up resistors on these pins, so with all four switches
of SW1 open the address will be 0101111b.
All LTC4266 chips also respond to the global address
0110000b regardless of the state of their AD3-AD0 pins.
I2C Bus Lines
The LTC4266 has separate pins for SDAIN and SDAOUT to
facilitate the use of opto-couplers. The DC1366B provides
test points for both SDAIN and SDAOUT to make it easy to
connect to any type of breadboard or development tools.
The DC1366B ties SDAIN and SDAOUT with shunt R11.
The DC590 includes pull-up resistors on the SDA and SCL
lines, while the DC1366B board has none. If the DC590
board is replaced by a different I2C master, the user must
make sure there are appropriate pull-up resistors on SDA
and SCL.
Interrupts
The LTC4266 includes an open-drain interrupt line for
signaling the host controller when it needs service. This
signal can be accessed on the DC1366B at the INT test
point. An LED is also included to indicate an interrupt.
Connecting Multiple DC1366B Boards
To use multiple DC1366B on a common I2C bus, simply
connect their J6 connectors together with ribbon cable
(14-conductor, 1mm pitch).
dc1366bfa
DEMO MANUAL DC1366B
Operation
Up to sixteen DC1366B can be controlled by a single I2C
master. Remember to set each board to a different I2C
address using the DIP switch.
The DC590 cannot supply enough current on VDD for more
than five or six DC1366B boards; an external VDD power
supply is recommended if more than five DC1366B boards
are connected together.
If a large number of DC1366B boards are connected to a
single VEE supply, be aware that banana patch cords are
only rated for approximately 14A. To avoid exceeding the
ampacity of the patch cords, the boards should be connected in a star configuration rather than connecting the
boards in a chain.
QuikEval GUI Software
The QuikEval GUI application software is a powerful tool
for learning the LTC4266 registers. Also available is the
LTC4266NDASI software interface data sheet that provides
further details on these registers.
Surge Protection
Ethernet ports can be subject to significant cable surge
events. To keep PoE voltages below a safe level and protect
the application against damage, protection components
are required at the main supply, at the LTC4266 supply
pins and at each port.
Bulk transient voltage suppression devices and bulk
capacitance are required across the main PoE supply
and should be sized to accommodate system level surge
requirements. The DC1366B diode D18 and capacitor C2
are example components for this protection at the main
PoE supply.
Each LTC4266 requires a 10Ω, 0805 resistor (R35) in series from supply AGND to the LTC4266 AGND pin. Across
the LTC4266 AGND pin and VEE pin are an SMAJ58A, 58V
TVS (D1) and a 1μF, 100V bypass capacitor (C64). These
components must be placed close to the LTC4266 pins.
Each port requires a pair of S1B clamp diodes: one from
OUTn to supply AGND and one from OUTn to supply VEE.
The diodes at the ports steer harmful surges into the supply
rails where they are absorbed by the surge suppressors
and the VEE bypass capacitance. The layout of these paths
must be low impedance.
Finally, the VDD logic supply and logic pins may also
require additional surge protection. Components D23,
C16, R36, D2, and C65 demonstrate surge protection
for VDD to DGND. For a positive VDD configuration where
VDD is +3.3V above AGND and DGND is tied to AGND, the
DC1366B has place holders at D28 and C66 for a 64V TVS
and high voltage capacitance from VDD to VEE.
dc1366bfa
7
DEMO MANUAL DC1366B
PCB Layout
Top Assembly
8
dc1366bfa
DEMO MANUAL DC1366B
PCB Layout
Layer 1
dc1366bfa
9
DEMO MANUAL DC1366B
PCB Layout
Layer 2
10
dc1366bfa
DEMO MANUAL DC1366B
PCB Layout
Layer 3
dc1366bfa
11
DEMO MANUAL DC1366B
PCB Layout
Layer 4
12
dc1366bfa
DEMO MANUAL DC1366B
PCB Layout
Bottom Assembly
dc1366bfa
13
A
B
C
TP16
VEE
VEE
-54V
RTN
RTN
TP18
J1
TP5
J2
TP20
DGND
TP17
DGND
+3.3V
JP5
VEE
D23
SMAJ5.0A
+3.3V
1
2
5
16V
C16
+ 10uF
3
1
RPW1
300
D7
VDD
ORANGE
D28
SMBJ64A
OPT
RPW2
3.9K
1/4W
D19
39V
D5
VEE
ORANGE
2
1
VEE
2
EXT VDD
SDAOUT
SDAIN
SCL
A0
A1
C66
4.7uF
100V
1206
OPT
0805
VDD
C2
10uF
100V
0805
R35
10
4
1
2
3
4
VDD
R10
0
HI
AGND_PIN
ADDRESS
SW1
TP9
LO 8
7
6
5
D18
SMCJ58A
TP8
RECOMMENDED MINIMUM
CABLE SURGE PROTECTION
+
R11
0
TP7
SDAIN SDAOUT INT
TP6
SCL
R9
0
OPT
A0
A1
A2
A3
INT
SDAOUT
SDAIN
SCL
7
6 AD0
5 AD1
4 AD2
AD3
10
DGND
1
3
38
INT
RED
D6
RL1
300
VDD
1
2
R36
10
SMAJ58A
1
RS1A
RS1B
RS1C
RS1D
1uF 100V 1206
2
Q1
G1
SW5 SD4
SW4 SD3
5
6
7
8
RS2A
RS2B
RS2C
RS2D
3
VDD
Q2
G2
C65
0.1uF
2
D2
SMAJ5.0A
1
5
6
7
8
RS3A
RS3B
RS3C
RS3D
Q3
G3
U1
LTC4266
RESET
TP31
5
6
7
8
RS4A
RS4B
RS4C
RS4D
MSD
TP19
VDD
VDD
Q4
G4
5
6
7
8
HI
LO
JP2
SW6
MSD
SW7
D8
S1B
LO
HI
MIDSPAN
JP4
AUTO
RESET
3
2
1
3
2
1
C22
0.22uF
X7R
D24
S1B
VEE
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
VEE
D25
S1B
D9
S1B
SD4
SD3
SD2
SD1
AUTO
SCALE = NONE
DILIAN R.
KIM T.
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CUSTOMER NOTICE
PSMN075-100MSE
1.00
1.00 1
1.00 2
1.00 3
PSMN075-100MSE
1.00
1.00 1
1.00 2
1.00 3
PSMN075-100MSE
1.00
1.00 1
1.00 2
1.00 3
PSMN075-100MSE
1.00
1.00 1
1.00 2
1.00 3
C64
D1
SD1
SW3 SD2
SW2
SD4
D
1
2
3
1
37
AGND
18
SD1
VEE
26
INT
SD2
VEE
39
13
2
VEE
25
SD3
14
SD1
15
SD2
16
SD3
17
SD4
SENSE 1
SENSE1 30
MID
36
+3.3V SOURCE
1
OUT 1
32
VDD
SENSE 2
SENSE2 27
MSD
USB VDD
1
2
OUT 2
29
AUTO
33
AUTO
SENSE 3
SENSE3 22
RESET
35
SENSE4 19
MID
OUT 3
24
RESET
SENSE 4
34
MSD
OUT 4
21
GATE 1
31
4 GATE1
GATE 2
28
GATE2
4
GATE 3
23
GATE3
4
GATE 4
20
GATE4
4
1
2
USBVDD
1
2
1
2
2
1
2
VEE
DATE:
N/A
SIZE
1
C47
0.22uF
X7R
TP4
OUT4
TP3
OUT3
TP2
OUT2
TP1
DATE
OUT4
OUT3
OUT2
OUT1
11-02-15
IC NO.
1
Monday, November 02, 2015
DEMO CIRCUIT 1366B
LTC4266CUHF
SHEET
1
OF
2
3
REV.
IEEE802.3AT PoE QUAD PSE CONTROLLER
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
VEE
C58
0.22uF
X7R
OUT1
D27
S1B
D11
S1B
DILIAN R.
APPROVED
TP10
RTN
REBUILD WITH CHANGE
DESCRIPTION
REVISION HISTORY
TECHNOLOGY
D26
S1B
D10
S1B
2
REV
TITLE: SCHEMATIC
C36
0.22uF
X7R
ECO
1
2
3
1
2
1
2
4
1
14
2
5
A
B
C
D
DEMO MANUAL DC1366B
Schematic Diagram
dc1366bfa
A
B
C
D
5
IN
FROM
PHY
CHASSIS GND
D
C
B
A
8
8
TP15
1
2
3
6
4
5
7
J4D
1
2
3
6
4
5
7
J4C
1
2
3
6
4
5
7
8
J4B
1
2
3
6
4
5
7
8
J4A
RJ45 - 4 PORTS
RJ45 - 4 PORTS
RJ45 - 4 PORTS
RJ45 - 4 PORTS
J4
SHIELD
J5
SHIELD
4
4
2kV
R4N2
75
R4P2
75
R3N2
75
C49
1000pF
R3P2
75
2kV
R2N2
75
2kV
C40
1000pF
R2P2
75
R1N2
75
2kV
C34
1000pF
R1P2
75
C19
1000pF
1
2
5
6
1
2
5
6
1
2
5
6
1
2
5
6
4
4
3
4
4
75
R4N1
R4P1
L8 BEAD
L7 BEAD
ETH1-230LD
L6 BEAD
75
75
75
75
R2N1
R3N1
75
R2P1
14
13
10
9
14
13
10
9
14
13
3
C60 0.01uF 200V
C56 0.01uF 200V
T4
C52 0.01uF 200V
C45 0.01uF 200V
T3
C38 0.01uF 200V
C31 0.01uF 200V
T2
C27 0.01uF 200V
10
C20 0.01uF 200V
T1
R1N1 75
9
14
13
10
9
3
R1P1 75
R3P1
L5 BEAD
ETH1-230LD
L4 BEAD
L3 BEAD
ETH1-230LD
L2 BEAD
L1 BEAD
ETH1-230LD
12
12
12
12
3
3
3
11
11
11
11
C53 1000pF 2kV
C42 1000pF 2kV
C28 1000pF 2kV
C17 1000pF 2kV
OUT4
OUT3
OUT2
OUT1
8
1
2
3
6
4
5
7
8
J5D
1
2
3
6
4
5
7
J5C
1
2
3
6
4
5
7
8
J5B
1
2
3
6
4
5
7
8
J5A
RJ45 - 4 PORTS
RJ45 - 4 PORTS
RJ45 - 4 PORTS
RJ45 - 4 PORTS
5
CUSTOMER NOTICE
OUT
TO
PD
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
DILIAN R.
KIM T.
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
PORT 4
PORT 3
PORT 2
PORT 1
2
N/A
DATE:
SIZE
TECHNOLOGY
IC NO.
LTC4266CUHF
DEMO CIRCUIT 1366B
1
Monday, November 02, 2015
SHEET
2
OF
3
REV.
2
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
IEEE802.3AT PoE QUAD PSE CONTROLLER
TITLE: SCHEMATIC
1
A
B
C
D
DEMO MANUAL DC1366B
Schematic Diagram
15
dc1366bfa
16
A
B
C
D
5
5
A0
A1
SD1
SD2
SD3
SD4
AUTO
+3.3V
2
2
2
1
Q9
Si2343DS
1
Q10
Si2343DS
1
Q11
Si2343DS
1
Q12
Si2343DS
3
3
3
3
R7
18M
R8
300
R17
18M
R18
300
R20
18M
R21
300
R23
18M
R24
300
1
1
1
1
GREEN
D12
OUT1
GREEN
D13
OUT2
GREEN
D14
OUT3
GREEN
D15
OUT4
OPT
OPT
OPT
OPT
OPT
RX2
RX3
RX4
RX5
RX6
1
3
5
7
9
11
13
15
4
DEMO PURPOSES ONLY
OPT
RX1
VDD
OPTIONAL LED DRIVE
1%
R6
1.1M
1%
R16
1.1M
1%
R19
1.1M
1%
R22
1.1M
2
4
J7
2
2
2
2
2
4
6
8
10
12
14
16
OPT
OUT1
OUT2
OUT3
OUT4
3
3
REP1
5.1K
SDAOUT
REP3
5.1K
5
6
7
8
U3
14
A1
A2
VSS
SCL
SDA
TP29
A0
WP
24LC025
VCC
4
3
2
1
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
CUSTOMER NOTICE
SDAIN
SCL
USBVDD
SCALE = NONE
DILIAN R.
KIM T.
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
QUICKEVAL FOR DEMO ONLY
REP2
5.1K
12
C4
0.1uF
10
9
8
13
6
11
4
7
2
5
J6
3
1
2
DATE:
N/A
SIZE
IC NO.
1
Monday, November 02, 2015
DEMO CIRCUIT 1366B
LTC4266CUHF
SHEET
3
OF
2
3
REV.
IEEE802.3AT PoE QUAD PSE CONTROLLER
TITLE: SCHEMATIC
LTC Confidential-For Customer Use Only
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
TECHNOLOGY Fax: (408)434-0507
1
A
B
C
D
DEMO MANUAL DC1366B
Schematic Diagram
dc1366bfa
DEMO MANUAL DC1366B
Revision History
REV
DATE
DESCRIPTION
A
12/15
Replaced Q1-Q4 with NXP PSMN075-100MSE, LFPAK33 package.
PAGE NUMBER
Replaced SDAIN/SDAOUT jumper, JP3, tie option with resistor shunt R11.
Changed diode D18 to SMCJ58A, 58V TVS.
Removed 3.3V LDO, U2.
Added AGND pin surge protection 10Ω resistor R35, moved logic pull-ups to VDD pin.
Added VDD pin surge protection 10Ω resistor R36.
Added SMAJ5.0A, 5V TVS, D2, across LTC4266 VDD and DGND pins.
Changed diode D23 to SMAJ5.0A, 5V TVS.
Renamed board logic ground to DGND, moved logic ground connections to DGND.
Renamed VEE high side supply connection to RTN.
Added R10, VDD pin shunt to AGND pin, and R9, DGND pin shunt option to AGND pin.
Moved LED pull-up to +3.3V.
dc1366bfa
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
17
DEMO MANUAL DC1366B
DEMONSTRATION BOARD IMPORTANT NOTICE
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. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
18 Linear Technology Corporation
dc1366bfa
LT 1215 REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2015
Similar pages