DEMO MANUAL DC2093A
LT4275/LT4321
LTPoE++/IEEE 802.3at/
IEEE 802.3af Compliant
Powered Device Interface
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 applications without corrupting the PD’s signature resistance
during detection and prevent reverse current during a short
at the Ethernet cable.
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 auxiliary 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 RDS(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 sufficient 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.
Table 1. Summary of Features Supported by the DC2093A Assemblies
ASSEMBLY
DC2093A-A
DC2093A-B
DC2093A-C
PoE STANDARD
LTPoE++
PoE+
PoE
PoE+
PoE
PoE
MAXIMUM POWER
LEVEL
POWER GOOD
INDICATOR (PWRGD)
PSE TYPE INDICATOR
(T2P)
AUXILIARY SUPPLY
SUPPORT
90W
Yes
Yes
No
25.5W
Yes
Yes
Yes
13W
Yes
No
Yes
dc2093af
1
DEMO MANUAL DC2093A
Performance summary
Table 2. DC2093A Performance Summary
PARAMETER
PD Input Voltage After Start-Up (VPORT)
Efficiency
PoE Type Switching Frequency
CONDITION
VALUE
At the PD Ethernet Port
LTPoE++ 38.7W
LTPoE++ 52.7W
49.8V to 57V
47.8V to 57V
LTPoE++ 70W
LTPoE++ 90W
45.1V to 57V
IEEE 802.3at (Type 2, 25.5W)
42.5V to 57V
IEEE 802.3af (Type 1, 13W)
37V to 57V
41.0V to 57V
DC2093A-A, VPORT = 48V, ILOAD = 1.1A
99.2% (Typical)
DC2093A-B, VPORT = 48V, ILOAD = 600mA
98.9% (Typical)
DC2093A-C, VPORT = 48V, ILOAD = 350mA
An LTPoE++ PSE is Powering a DC2093A-A
98.5% (Typical)
840Hz
Theory of Operation
When an LTPoE++ PSE is connected to the DC2093A demo
board RJ45 connector, J1, via a CAT5e or CAT6 Ethernet
cable, the PSE initiates the detection process. During this
process, the PoE ideal diode bridge controller is inactive and the body diodes of the PoE ideal diode bridge
MOSFETs form a silicon diode bridge. The PD solution
presents a 25k resistive load to the PSE. After the PD
has passed the detection process, the PSE uses an IEEE
802.3at/IEEE 802.3af or LTPoE++ classification method
to determine the power level the PSE can deliver to the
PD. The PSE turns on the port and provides power to the
PD if the classification is successful. Once the LT4275
detects the PSE has turned on the port, it drives an external
N-channel MOSFET to ramp up the output voltage. After a
successful PD controller output turn on, the LT4275 drives
a power good indicator (PWRGD) and a PSE type indicator
(T2P) (DC2093A-A and DC2093A-B only). The PWRGD
indicator signals the load to start drawing current and the
LT4321 to turn on the appropriate PoE ideal diode bridge
MOSFETs with low RDS(ON) in the high current path. This
reduces heat dissipation and increases delivered power
compared to the conventional diode bridge. The T2P indicator signals the load the type of PSE powering the PD.
IEEE 802.3at, and LTPoE++ power levels from 3.84W to
90W. Refer to Table 3 for the power levels. If an LTPoE++
power level is selected, an IEEE 802.3af or IEEE 802.3at
compliant PSE will classify this PD as a Class 4 PD. The
DC2093A‑B includes a preselected RCLS resistor to support
IEEE 802.3at 2-event classification and this board does not
contain jumper blocks. The DC2093A-C includes multiple
jumpers to support all IEEE 802.3af power levels. Table 3
shows each shunt position and its associated class number
and power level for the DC2093A-A and -C boards. Use
Table 3 as a selection guide to choose a suitable power
level for the load.
Classification Signaling
The resistors at RCLS and RCLS++ determine the classification signature and sequence. The DC2093A-A includes user-selectable jumpers to support IEEE 802.3af,
2
Table 3. DC2093A-A and DC2093A-C Shunt Positions for PoE
Power Levels
ASSEMBLY
PoE POWER LEVEL AT
CLASS
THE PD INPUT
RCLASS JUMPERS
DC2093A-A & -C
0
13W
JP1
JP2
DC2093A-A & -C
1
3.84W
JP3
JP4
DC2093A-A & -C
2
6.49W
JP5
JP6
DC2093A-A & -C
3
13W
JP7
JP8
DC2093A-A
4
25.5W
JP9
JP10
DC2093A-A
4*
38.7W
JP11
JP12
DC2093A-A
4*
52.7W
JP13
JP14
DC2093A-A
4*
70W
JP15
JP16
DC2093A-A
4*
90W
JP17
JP18
*An LTPoE++ PD will be classified as Class 4 by an IEEE 802.3at/af
compliant PSE.
dc2093af
DEMO MANUAL DC2093A
Theory of Operation
Power Good Indicator and Power Supply Start-Up
Auxiliary Supply Support
The LT4275 limits the inrush current to the output bulk
capacitor by controlling the output voltage slew rate
during turn-on. The slew rate is preprogrammed via a
resistor and a capacitor at the LT4275 HSGATE pin on the
DC2093A to limit the inrush current to the bulk capacitor
on board. If more capacitance is desired at the output,
refer to Inrush and Powered On section in the LT4275
data sheet to recalculate the inrush current and ensure it
is below the IEEE requirement of approximately 100mA.
The inrush current limit will cause startup problems if an
attached load draws more than 100mA of current during
inrush. Therefore, it is strongly recommended to use the
PWRGD indicator on the DC2093A to interface to a load
such as a DC/DC converter as shown in Figures 1, 2 and 4.
The DC2093A-B and DC2093A-C versions support an
auxiliary supply input. The auxiliary supply input has priority over the PoE input. When the PD controller detects
a valid voltage from the auxiliary supply input, it turns off
the N-channel MOSFET (Q2) to cut the power from the
PSE and lets the auxiliary supply take over powering the
load. The PSE may detect the disconnected PD and turn
off the port. The PWRGD indicator outputs a logic high
signal when an auxiliary supply is present. The T2P indicator outputs a logic low signal on the DC2093A-B board
when an auxiliary supply is present. The auxiliary supply
input is an assembly option on the DC2093A-A board.
PSE Type Indicator
Refer to Table 4 for the summary of T2P indicator signals
supported by the DC2093A assembly. The T2P signal is
valid after PWRGD is active. This indicator is not connected
on the DC2093A-C.
Table 4. Summary of T2P Signals Supported by the DC2093A
Assemblies
ASSEMBLY
DC2093A-A
DC2093A-B
DC2093A-C
PSE TYPE
LTPoE++
T2P SIGNAL
840Hz, 50% Duty Cycle
IEEE 802.3at (Type 2, PoE+)
Logic Low
IEEE 802.3af (Type 1, PoE)
Logic High
LTPoE++
Logic Low
IEEE 802.3at (Type 2, PoE+)
Logic Low
IEEE 802.3af (Type 1, PoE)
Logic High
Any PSE
Not Supported
DC2093A Companion PSE Demo Boards
Linear Technology offers a variety of PSE solutions to
evaluate with DC2093A. Refer to Table 5 to select a PSE
demo board based on the DC2093A assembly and the
application power requirement.
Table 5. Selection of Companion PSE Demo Board depending
on the DC2093 Assembly and the PoE Power Level
DC2093
ASSEMBLY
PoE POWER
LEVEL
COMPANION PSE DEMO
BOARD
DC2093A-A
90W
DC1814A-D
70W
DC1814A-C
52.7W
DC1814A-B
38.7W
DC1814A-A
DC2093A-B
25.5W
DC1567A
DC2093A-C
13W
DC981A/B
**Contact Linear for multi-port PSE demo board options.
dc2093af
3
DEMO MANUAL DC2093A
DC2093A-A quick Start Procedure
NOTE: Handle the DC2093A-A by the edge of the board.
Power over Ethernet Input
1. Refer to Figure 1 to evaluate the DC2093A-A with a DC/
DC converter. If a resistive or an active load is used
to evaluate the DC2093A-A, use the setup diagram as
shown in Figure 2.
not select a jumper position corresponding to a higher
power level than the LTPoE++ PSE can provide. Otherwise, the LTPoE++ PSE will not turn on the PD after
classification.
2. Default class select shunt positions are at JP1 and JP2
on the DC2093A-A board. In this configuration, any
PSE with enough power will turn on this PD. Choose a
power level from Table 3 and select the corresponding
shunt positions.
4. Connect the output of the PSE to the RJ45 connector
(J1) on the DC2093A-A board with a CAT5e or CAT6
Ethernet cable.
3. Check the power delivery capability of the LTPoE++
PSE to ensure it can power the PD and the load. Do
5. After connection has been established, verify that the
LED (D3) is lit. This indicates the PSE has successfully
detected and powered the PD
Figure 1. Setup Diagram for the DC2093A-A with a DC-DC Converter, a Microprocessor, and an LTPoE++ PSE
dc2093af
4
DEMO MANUAL DC2093A
DC2093A-A quick Start Procedure
Figure 2. Setup Diagram for DC2093A-A with a Resistive or an Active Load
dc2093af
5
DEMO MANUAL DC2093A
DC2093A-B quick Start Procedure
NOTE: Handle the DC2093A-B by the edge of the board.
Power over Ethernet Input
Auxiliary Supply Input
1. Refer to Figure 3 to evaluate the DC2093A-B with a DC/
DC converter. If a resistive or an active load is used
to evaluate the DC2093A-B, use the setup diagram as
shown in Figure 4.
1. Refer to Figure 5 to evaluate the DC2093A-B with a
DC/DC converter and an auxiliary DC power supply.
2. Connect the output of the PSE to the RJ45 connector
(J1) on the DC2093A-B board with a CAT5e or CAT6
Ethernet cable.
3. After connection has been established, verify that the
LED (D3) is lit. This indicates the PSE has successfully
detected and powered the PD.
2. Connect the auxiliary supply to the AUX+ to AUX– inputs. Check to make sure the voltage polarity is correct
before turning on the auxiliary power supply.
3. Turn on the auxiliary power supply and verify that the
LED (D3) is lit.
Figure 3. Setup Diagram for the DC2093A-B with a DC/DC Converter, a Microprocessor, and a Type 2 PSE
dc2093af
6
DEMO MANUAL DC2093A
DC2093A-B quick Start Procedure
Figure 4. Setup Diagram for DC2093A-B with a Resistive or an Active Load
dc2093af
7
DEMO MANUAL DC2093A
DC2093A-B quick Start Procedure
Figure 5. Setup Diagram for the DC2093A-B with a DC/DC Converter
dc2093af
8
DEMO MANUAL DC2093A
DC2093A-C quick Start Procedure
NOTE: Handle the DC2093A-C by the edge of the board.
Power over Ethernet Input
Auxiliary Supply Input
1. Refer to Figure 6 to evaluate the DC2093A-C with a
DC/DC converter. If a resistive or an active load is used
to evaluate the DC2093A-C, use the setup diagram as
shown in Figure 7.
1. Refer to Figure 8 to evaluate the DC2093A-C with a
DC/DC converter and an auxiliary DC power supply.
2. Connect the output of the PSE to the RJ45 connector
(J1) on the DC2093A-C board with a CAT5e or CAT6
Ethernet cable.
3. After connection has been established, verify that the
LED (D3) is lit. This indicates the PSE has successfully
detected and powered the PD.
2. Connect the auxiliary supply to the AUX+ to AUX– inputs. Check to make sure the voltage polarity is correct
before turning on the auxiliary power supply.
3. Turn on the auxiliary power supply and verify that the
LED (D3) is lit.
Figure 6. Setup Diagram for the DC2093A-C with a DC/DC Converter and a Type 1 PSE
dc2093af
9
DEMO MANUAL DC2093A
DC2093A-C quick Start Procedure
Figure 7. Setup Diagram for DC2093A-C with a Resistive or an Active Load
Figure 8. Setup Diagram for the DC2093A-C with a DC/DC Converter and an Auxiliary DC Power Supply
dc2093af
10
DEMO MANUAL DC2093A
quick Start Procedure
99.4
PERCENT EFFICIENCY (%)
99.3
99.2
99.1
99.0
98.9
98.8
98.7
98.6
0
0.5
1
1.5
LOAD CURRENT (A)
2
2.5
dc 2093a F09
Figure 9. DC2093A-A Efficiency at Various PoE Load Currents (without LED D3)
Figure 10. Thermal Image. DC2093A-A with 90W Load. Top View
dc2093af
11
DEMO MANUAL DC2093A
quick Start Procedure
Figure 11. Thermal Image. DC2093A-A with 90W Load. Bottom View
dc2093af
12
DEMO MANUAL DC2093A
parts list
ITEM
QTY REFERENCE
Required Circuit Components
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
2
0
1
1
4
1
8
1
1
1
0
1
4
0
1
2
2
C1, C5
C2
C3
CG1
CT1, CT2, CT3, CT4
D2
Q3 TO Q10
R11, R18
R12
R13
R17
R14
RT1 TO RT4
RV1 TO RV4
U2
XJP1, XJP2
1
1
DC2093A
2
1
Q1
3
1
R10
4
1
R15
5
2
RC1, RC6
6
2
RC2, RC8
7
2
RC3, RC10
8
2
RC4, RC5
9
1
RC7
10
1
RC9
11
1
RC11
12
1
T1
13
1
U1
Optional Circuit Components
1
0
D1
2
0
E5, E6
3
0
Q2
4
0
R9, R16
Hardware for Demo Board Only
1
1
C4
2
1
CG2
3
1
D3
4
1
D4
5
4
E1, E2, E4, E7
6
1
E3
PART DESCRIPTION
MANUFACTURER/PART NUMBER
DC2093A General BOM
CAP, X7S, 0.047µF, 100V, 10%, 0603
CAP, OPT, 0402
CAP, X7R, 47nF, 100V, 10% 0805
CAP, X7R, 1nF, 2kV, 10% 1808
CAP, X7R 0.01µF 10% 200V 0805
DIODE, SMBJ58A, SMA-DIODE
TRANS, PSMN075-100MSE LFPAK33
RES, CHIP, 0Ω, 5%, 0603
RES, CHIP, 8.2Ω, 5%, 0603
RES, CHIP, 3.3k, 5%, 0603
RES, OPT
RES, CHIP, 100k, 5%, 0603
RES, CHIP, 75Ω, 5%, 0603
VARISTOR, OPT
IC, LT4321IUF, QFN16UF
SHUNT, 0.079'' CENTER
STENCILS (TOP & BOTTOM)
DC2093A-A BOM
DC2093A GENERAL BOM
TRANS, PSMN040-100MSE, LFPAK33
RES, CHIP, 0, 5%, 0603
RES, CHIP, 100k, 5%, 0603
RES, CHIP, 140, 1%, 0805
RES, CHIP, 76.8, 1%, 0805
RES, CHIP, 49.9, 1%, 0805
RES, CHIP, 34.8, 1%, 0805
RES, CHIP, 46.4, 1%, 0805
RES, CHIP, 64.9, 1%, 0805
RES, CHIP, 118, 1%, 0805
XFMR, WÜRTH 749022016
IC, LT4275AIDD DFN10DD/MSOP10MS
NXP, PSMN040-100MSE
VISHAY, CRCW06030000Z0EA
VISHAY, CRCW0603100KJNEA
PANASONIC, ERJ-6ENF1400V
PANASONIC, ERJ-6ENF76R8V
VISHAY, CRCW080549R9FKEA
VISHAY, CRCW080534R8FKEA
PANASONIC, ERJ-6ENF46R4V
VISHAY, CRCW080564R9FKEA
VISHAY, CRCW0805118RFKEA
WÜRTH 749022016
LINEAR TECHNOLOGY, LT4275AIDD
DIODE, OPT, SMA
TP, OPT
TRANS, Si2328DS-T1-GE3, SOT23
RES, OPT
OPT
OPT
VISHAY, Si2328DS-T1-GE3
OPT
CAP, 22µF, 100V, OSCON
CAP, X7R, 1nF, 2kV, 10% 1808
LED, GREEN
DIODE, MMSZ5242BS-7-F, SOD323
TP, TURRET, 0.094"
TP, TURRET, 0.094"
SUN ELECT, 100CE22BS
TDK, C4520X7R3D102K
ROHM, SML-010FTT86L
DIODES INC, MMSZ5242BS-7-F
MILL-MAX 2501-2-00-80-00-00-07-0
MILL-MAX 2501-2-00-80-00-00-07-0
TDK, C1608X7S2A473K080AB
OPT
AVX, 08051C473KAT2A
TDK, C4520X7R3D102K
AVX, 08052C103KAZ2A
DIODE, INC, SMBJ58A-13-F
NXP, PSMN075-100MSE
VISHAY, CRCW06030000Z0EA
VISHAY, CRCW06038R20JNEA
VISHAY, CRCW06033K3JNEA
OPT
VISHAY, CRCW0603100KJNEA
VISHAY, CRCW060375R0JNEA
SANKOSHA, SD4-90, OPT
LINEAR TECHNOLOGY, LT4321IUF
SAMTEC, 2SN-BK-G
STENCIL DC2093A
dc2093af
13
DEMO MANUAL DC2093A
parts list
ITEM
7
8
9
10
11
12
13
QTY
2
18
1
1
1
4
1
REFERENCE
J1, J2
JP1 TO JP18
Q11
R19
RMPS1
RT5 TO RT8
1
1
DC2093A
2
1
D1
3
1
E3
4
2
E5, E6
5
1
Q2
6
1
R9
7
1
R10
8
1
R15
9
1
R16
10
1
RMPS1
11
1
T1
12
1
U1
13
1
Optional Circuit Components
1
0
JP1 TO JP18
2
0
Q1
3
0
RC1 TO RC11
Hardware for Demo Board Only
1
1
C4
2
1
CG2
3
1
D3
4
1
D4
E1, E2, E4, E7
5
4
6
1
E3
7
2
J1, J2
8
1
Q11
9
1
R19
10
1
RMPS1
11
4
RT5 TO RT8
12
1
1
2
3
4
5
6
1
1
2
4
1
1
DC2093A
D1
E5, E6
JP1, JP3, JP5, JP7
Q2
R9
PART DESCRIPTION
CONN, SS-7188S-A-NF
HDR, 1X2 2MM, HD1X2-079
TRANS, PSMN040-100MSE, LFPAK33
RES, CHIP, 30k, 5%, 0603
RES, CHIP, 5.1k, 5%, 2512
RES, CHIP, 75Ω, 5%, 0603
FAB, PRINTED CIRCUIT BOARDS
DC2093A-B BOM
DC2093A GENERAL BOM
DIODE, B1100A, 100V, SMA
TP, TURRET, 0.094"
TP, TURRET, 0.094"
TRANS, Si2328DS-T1-GE3, SOT23
RES, CHIP, 82.5k, 1%, 0603
RES, CHIP, 20k, 1%, 0603
RES, CHIP, 100k, 5%, 0603
RES, CHIP, 34.8Ω, 1%, 0805
RES, CHIP, 4.7k, 5%, 2512
XFMR, WÜRTH 749022017
IC, LT4275BIDD DFN10DD/MSOP10MS
FAB, PRINTED CIRCUIT BOARDS
MANUFACTURER/PART NUMBER
STEWART CONNECTOR, SS-7188S-A-NF
SULLINS, NRPN021PAEN-RC
NXP, PSMN040-100MSE
VISHAY, CRCW060330K0JNEA
VISHAY, CRCW25125K10JNEA
VISHAY, CRCW060375R0JNEA
DEMO CIRCUIT 2093A
DIODE INC B1100A
MILL-MAX 2501-2-00-80-00-00-07-0
MILL-MAX 2501-2-00-80-00-00-07-0
VISHAY, Si2328DS-T1-GE3
VISHAY, CRCW060382K5FKEA
VISHAY, CRCW060320KFKEA
VISHAY, CRCW0603100KJNEA
VISHAY, CRCW080534R8FKEA
VISHAY, CRCW25124K70JNEG
WÜRTH 749022017
LINEAR TECHNOLOGY, LT4275BIDD
DEMO CIRCUIT 2093A
HDR, 1X2 2MM, OPT
TRANS, OPT
RES, OPT
OPT
OPT
OPT
CAP, 22µF, 100V, OSCON
CAP, X7R, 1nF, 2kV, 10% 1808
LED, GREEN
DIODE, MMSZ5242BS-7-F, SOD323
TP, TURRET, 0.094"
TP, TURRET, 0.094"
CONN, SS-7188S-A-NF
TRANS, PSMN040-100MSE, LFPAK33
RES, CHIP, 30k, 5%, 0603
RES, CHIP, 4.7k, 5%, 2512
RES, CHIP, 75Ω, 5%, 0603
FAB, PRINTED CIRCUIT BOARDS
DC2093A-C BOM
DC2093A GENERAL BOM
DIODE, B1100A, 100V, SMA
TP, TURRET, 0.094"
HDR, 1X2 2MM
TRANS, Si2328DS-T1-GE3, SOT23
RES, CHIP, 82.5k, 1%, 0603
SUN ELECT, 100CE22BS
TDK, C4520X7R3D102K
ROHM, SML-010FTT86L
DIODES INC, MMSZ5242BS-7-F
MILL-MAX 2501-2-00-80-00-00-07-0
MILL-MAX 2501-2-00-80-00-00-07-0
STEWART CONNECTOR, SS-7188S-A-NF
NXP, PSMN040-100MSE
VISHAY, CRCW060330K0JNEA
VISHAY, CRCW25124K70JNEG
VISHAY, CRCW060375R0JNEA
DEMO CIRCUIT 2093A
DIODE INC. B1100A
MILL-MAX 2501-2-00-80-00-00-07-0
SAMTEC, TMM-102-02-L-S
VISHAY, Si2328DS-T1-GE3
VISHAY, CRCW060382K5FKEA
dc2093af
14
DEMO MANUAL DC2093A
parts list
ITEM
QTY REFERENCE
7
1
R10
8
1
RC1
9
1
RC2
10
1
RC3
11
1
RMPS1
12
1
T1
13
1
U1
14
1
Optional Circuit Components
1
0
E3
2
0
JP2, JP4, JP6, JP8, JP9 TO JP18
3
0
Q1
4
0
R15
5
0
R16
6
0
RC4 TO RC11
Hardware for Demo Board Only
1
1
C4
2
1
CG2
3
1
D3
4
1
D4
5
4
E1, E2, E4, E7
6
2
J1, J2
7
4
JP1, JP3, JP5, JP7
8
1
Q11
9
1
R19
10
1
RMPS1
11
4
RT5 TO RT8
12
1
PART DESCRIPTION
RES, CHIP, 20k, 1%, 0603
RES, CHIP, 140, 1%, 0805
RES, CHIP, 76.8, 1%, 0805
RES, CHIP, 49.9, 1%, 0805
RES, CHIP, 4.3K, 5%, 2512
XFMR, WÜRTH 749023015
IC, LT4275CIDD DFN10DD/MSOP10MS
FAB, PRINTED CIRCUIT BOARDS
MANUFACTURER/PART NUMBER
VISHAY, CRCW060320KFKEA
PANASONIC, ERJ-6ENF1400V
PANASONIC, ERJ-6ENF76R8V
VISHAY, CRCW080549R9FKEA
PANASONIC, ERJ-1TYJ432U
WÜRTH 749023015
LINEAR TECHNOLOGY, LT4275CIDD
DEMO CIRCUIT 2093A
TP, TURRET, 0.094", OPT
HDR, 1X2 2MM, OPT
TRANS, OPT
RES, OPT
RES, OPT
RES, OPT
OPT
OPT
OPT
OPT
OPT
OPT
CAP, 22µF, 100V, OSCON
CAP, X7R, 1nF, 2kV, 10% 1808
LED, GREEN
DIODE, MMSZ5242BS-7-F, SOD323
TP, TURRET, 0.094"
CONN, SS-7188S-A-NF
HDR, 1X2 2MM
TRANS, PSMN040-100MSE, LFPAK33
RES, CHIP, 30k, 5%, 0603
RES, CHIP, 4.3k, 5%, 2512
RES, CHIP, 75Ω, 5%, 0603
FAB, PRINTED CIRCUIT BOARDS
SUN ELECT, 100CE22BS
TDK, C4520X7R3D102K
ROHM, SML-010FTT86L
DIODES INC, MMSZ5242BS-7-F
MILL-MAX 2501-2-00-80-00-00-07-0
STEWART CONNECTOR, SS-7188S-A-NF
SULLINS, NRPN021PAEN-RC
NXP, PSMN040-100MSE
VISHAY, CRCW060330K0JNEA
PANASONIC, ERJ-1TYJ432U
VISHAY, CRCW060375R0JNEA
DEMO CIRCUIT 2093A
dc2093af
15
A
B
C
D
9
E5*
10
E6 *
RV1
SD4-90
OPT
RV2
SD4-90
OPT
SS-7188S-A-NF
1
2
3
4
5
6
7
8
D2
SMBJ58A
RV3
SD4-90
OPT
RT2
75
R10*
R9 *
1%
RT4
75
4
R16 *
RCLS
0805S
1%
3
2
1
R17
RCLS++
OPT
0805S
1%
5
2
GND
RCLASS++
RCLASS
AUX
RT7
75
Q2
8
7
6
5
6
2
Q1*
1
2
3
4
5
6
7
8
TP3
*
TP4 TP5
7 PWRGD
8
9
10
3
RT8
75
3
OUT TO PHY
R14
100K
D4
MMSZ5242BS, 12V
C3
47nF
X7R
100V
0805S
R13
3.3K
3
2
1
A
A
A
A
A
A,C
A,C
A,C
4 ***
4 ***
4 ***
4 ***
4
3
2
1
0
R15*
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
R19
30K
1
2
3
PWRGD
D3
LED
RMPS *
1W
2512
2
REV
JP2
JP4
JP6
JP8
JP10
JP12
JP14
JP16
JP18
JP1
JP3
JP5
JP7
JP9
JP11
JP13
JP15
JP17
CLASS CLASS ++
SCALE = NONE
5
6
7
8
2
DATE:
N/A
DESCRIPTION
E1
JP10**
JP8 **
JP6**
JP4 **
RC7 **
1% 0805
RC11**
1% 0805
RC9**
1% 0805
1% 0805
JP18**
JP16**
JP14**
JP12**
VOUT+
JP17**
JP15**
JP13**
JP11**
JP9**
JP7**
JP5 **
JP3 **
RC5**
KAUNG H.
E2
E3*
E4
VOUT-
T2P
PWRGD
PWRGD
TECHNOLOGY
LAB_TEST_VOUT-
1
LT4275XIDD, LT4321IUF
DEMO CIRCUIT 2093A
SHEET 1
OF 2
2
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
E7
Wednesday, August 14, 2013
IC NO.
TP2
USE VOUT+ AND VOUT- TERMINALS
TO CONNECT TO A PWRGD ENABLED
POWER SUPPLY ONLY.
0805 1%
RC10**
0805 1%
RC8 **
0805 1%
RC6**
0805 1%
RC4 **
0805 1%
RC3**
0805 1%
RC2 **
0805 1%
RC1**
DATE
06-26-13
APPROVED
RCLASS JUMPERS
JP1**
JP2 **
PRODUCTION
LTPOE + + POWERED DEVICE
TITLE: SCHEMATIC
SIZE
TP1
1
REVISION HISTORY
USE VOUT+ AND LAB_TEST_VOUTTERMINALS FOR LAB TESTING
WITH ELECTRONIC OR RESISTIVE
LOAD ONLY. NOT NEEDED FOR
FINAL CIRCUIT.
22uF
100V
+ C4
Q11
PSMN040-100MSE
KAUNG H.
KAUNG H.
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
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
3
90W
70W
52.7W
38.7W
25.5W
13W
6.49W
3.84W
13W
POE
ASSY
POWER
CLASS
A,C
__
ECO
JUMPER SELECTIONS
2
LTPOE + + PD WILL BE CLASSIFIED AS CLASS 4
BY AN IEEE 802.3 AT COMPLIANT PSE.
***AN
SS-7188S-A-NF
J2
CUSTOMER NOTICE
T2P
PWRGD
HSSRC
HSGATE
VPORT
R12
8.2
CG2
1000pF
1808
2KV
RT6
75
1
U1*
D1*
RT5
75
IEEUVLO
12
D- 10
TD 11
D+
9
D- 7
TD 8
D+
6
D- 4
TD 5
D+
3
D- 1
TD 2
D+
RCLASS++ 4
RCLASS
0.047uF
100V
R11
0603
0
C1
CG1
1000pF
1808
2KV
C2
OPT
0402S
1. ALL RESISTORS AND CAPACITORS ARE 0603
2. ALL RESISTORS TOLERANCE RATING ARE 5%
* SEE OPTION TABLES ON SHEET 2
5
RT3
75
13
15 X14 TX
X+
16
18 X17 TX
X+
19
21 X20 TX
X+
22
24 X23 TX
X+
*
CT1
CT2
CT3
CT4
RV4
0.01uF 0.01uF 0.01uF 0.01uF
SD4-90 200V 200V 200V 200V
OPT
0805S 0805S 0805S 0805S
RT1
75
NOTE 1: UNLESS OTHERWISE SPECIFIED
AUX-
VPORTN
VPORTP
AUX+
37V - 57V
SPARE2
SPARE1
DATA2
DATA1
IN FROM PSE
37V-57V
J1
1
2
1
9
10
4
T1
GND
11
1
4
1
RCLASS
2
VPORTN
2
16
RCLASS++
4
5
A
B
C
D
DEMO MANUAL DC2093A
Schematic Diagram
dc2093af
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.
A
B
C
D
E3
E5
PSMN075-100MSE
4BG12
Q6
PSMN075-100MSE
4BG36
Q4
SPARE1
PSMN075-100MSE
4TG36
Q3
5
PSMN075-100MSE
4BG45
Q10
SPARE2
PSMN075-100MSE
4TG45
Q9
3
SCALE = NONE
KAUNG H.
KAUNG H.
APPROVALS
VPORTN
PSMN075-100MSE
4BG78
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
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
4
VPORTP
1
1
4
LT4321IUF
TG45
SPARE1 3
TG45
IN45
IN36
TG36
140
DATE:
N/A
SIZE
TECHNOLOGY
2
VPORTN
PWRGD
VPORTP
R18
0
C5
0.047uF
100V
LT4275XIDD, LT4321IUF
DEMO CIRCUIT 2093A
1
SHEET 2
OF 2
2
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
EN
9
OUTN 17
OUTN
10
11
12
LTPOE + + POWERED DEVICE
Monday, August 19, 2013
IC NO.
EP
EN
OUTP
76.8 49.9 OPT OPT OPT OPT OPT OPT OPT OPT
OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT OPT
U2
DATA2 2
TG36
OPT
OPT
TITLE: SCHEMATIC
OPT
-C
VPORTP
OPT
OPT
STUFF
-B
PSMN075-100MSE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
ASSY JP1,3,5,7 JP2,4,6,8 JP9-JP18 RC1 RC2 RC3 RC4 RC5 RC6 RC7 RC8 RC9 RC10 RC11
-A
STUFF STUFF STUFF 140 76.8 49.9 34.8 34.8 140 46.4 76.8 64.9 49.9 118
4TG78
**
Si2328DS-T1-GE3 82.5K 20K
CUSTOMER NOTICE
1. ALL RESISTORS AND CAPACITORS ARE 0603
2. ALL RESISTORS TOLERANCE RATING ARE 5%
4.3K
OPT OPT
OPT
RMPS1
4.7K
0
5.1K
R10 R15 R16
Si2328DS-T1-GE3 82.5K 20K 100K 34.8
OPT
OPT
R9
OPT
Q2
3
100K OPT
Q1
PSMN040-100MSE
NOTE 2: UNLESS OTHERWISE SPECIFIED
Q8
DATA2
PSMN075-100MSE
4TG12
Q5
OPT STUFF STUFF 749023015 B1100A
LT4275CIDD
-C
Q7
STUFF STUFF STUFF 749022017 B1100A
D1
OPT
T1
749022016
E6
OPT
LT4275BIDD
STUFF OPT
-B
U1
ASSY
-A LT4275AIDD
DATA1
*
8
7
6
5
3
2
1
8
7
6
5
3
2
1
8
7
6
5
3
2
1
8
7
6
5
3
2
1
8
7
6
5
3
2
1
8
7
6
5
3
2
1
8
7
6
5
3
2
1
DATA1
4
TG78
8
7
6
5
3
2
1
TG12
5
TG12
16
BG12
TG78
SPARE2 6
IN12
15
BG36
IN78
14
BG12
7
BG78
BG78
13
BG36
BG45
8
BG45
5
A
B
C
D
DEMO MANUAL DC2093A
Schematic Diagram
dc2093af
17
DEMO MANUAL DC2093A
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
dc2093af
18 Linear Technology Corporation
LT 0913 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
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