Linear Technology DC981A User manual

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dc981abf
DEMO MANUAL
DC981A/DC981B
Description
LTC4263
Main Board, Single Port
Autonomous PSE/Daughter Card PSE
Demonstration circuits 981A and 981B feature the
LTC
®
4263 in single port Power over Ethernet (PoE) power
sourcing equipment (PSE) midspan and endpoint solu-
tions. TheLTC4263isanautonomoussingle-channelPSE
controller for use in IEEE802.3af compliant PoE systems.
It includes an onboard planar power MOSFET, internal
inrush, current limit, and short-circuit control, powered
device (PD) detection and classification circuitry, and
selectable AC or DC disconnect sensing. Onboard control
algorithmsprovidecompletePSEcontroloperationwithout
theneedof a microcontroller.TheLTC4263 simplifies PSE 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.
performance summary
Quick start proceDure
implementation, needing only a single 48V supply and a
small number of passive support components. Other op-
tions shown on the DC981A include legacy PD detection
enable,midspanbackofftimerenable,powerclassenforce
mode, and power management enable. An LED for each
port is driven by the respective LTC4263 to indicate the
state of the port.
Design files for this circuit board are available at
http://www.linear.com/demo/DC981A
Table 1. Typical DC981, Specifications are at TA= 25°C
PARAMETER CONDITION VALUE
Supply Voltage Voltage for IEEE802.3af Compliance at Port Output 46V to 57V
Midspan Mode Detection Backoff Midspan Enabled, Failed Detection 3.2s
Detection Range Valid IEEE802.3af PD Detection 17kΩ to 29.7kΩ
Set Maximum Allocated Power Power Management Enabled, RPM = 12.4kΩ 17W
Ethernet Powered Pairs Pinout Endpoint PSE, Alternative A (MDI)
Midspan PSE, Alternative B 1/2(+), 3/6(–) 4/5(+), 7/8 (–)
Demonstration circuits 981A and 981B are easy to set
up to evaluate the performance of the LTC4263. Refer to
Figure 1 for proper measurement equipment setup and
follow the procedure below.
1. Place jumpers in the following positions:
JP1 EN
JP2 EN
JP3 DIS
JP4 AC
JP5 AC
JP6 EN
2. Insert daughter card (DC981B) to main board
(DC981A) at polarized connector J3.
3. Apply 48V across VDD48 and VSS.
4. Connect a scope probe at VOUT_MD and VOUT_EP
both referenced to positive rail VDD48.
5. Connect a valid PD to either midspan PSE or
endpoint PSE.
6. Connect a second PD to the open port.

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dc981abf
DEMO MANUAL
DC981A/DC981B
operating principles
Figure 1. Basic DC981A/DC981B Equipment Setup

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dc981abf
DEMO MANUAL
DC981A/DC981B
The DC981 provides two implementations of a PSE con-
trolled by the LTC4263, a midspan PSE and an endpoint
PSE. A single 48V supply is all that is required to power
the board. This in turn provides power to the midspan PSE
and endpoint PSE outputs. On each solution, an LTC4263
providesdetection,classification,powermanagement,safe
power on, port current limit, and disconnect detection.
Midspan PSE
In the midspan solution, a legacy device (router, switch,
etc.) that does not have PoE is connected to MIDSPAN
IN. Data is passed through to MIDSPAN OUT along with
PoE which goes out to a PD. Power is applied directly
to Ethernet pairs 4/5 and 7/8. The LTC4263 circuitry is
located in a small layout area behind the RJ45 connec-
tor and switches power on the negative rail. To show the
different functions of the LTC4263, jumpers allow for the
user to select the options of AC or DC disconnect, legacy
detection, midspan backoff timing, and class enforce-
ment. An LED that shows the status of the port is driven
by a switcher in the LTC4263 to improve efficiency when
VDD5 is provided internally. Push button switch SW1 ties
the shutdown pin to ground to disable the LTC4263 in the
midspan solution.
A PSE implementing alternative B pin out must back off
from detection for at least two seconds after a failed at-
tempt. This is to avoid conflict of detection, for example,
should a potential endpoint PSE and midspan PSE be
connected to the same PD. To enable this feature, set JP2
to DIS. JP2 ties the MIDSPAN pin to VDD5 to enable the
LTC4263 backoff timer or to VSS to disable. A 3.2s delay
occurs after every failed detect cycle unless the result is
open circuit. If held at VSS, no delay occurs after failed
detect cycles.
Endpoint PSE
The endpoint solution is primarily shown on a small
daughter card (DC981B). This card is the same height
and width as the integrated RJ45 connector that it slides
behind on the main board (DC981A). The RJ45 includes
Ethernet magnetics and common mode termination. A
layout option shows the same components can be placed
underthesameRJ45connector.Theminimumconnections
to the daughter card are VSS, VDD48 and VOUT. Power is
switched over from the daughter card out to the Ethernet
data pairs (1/2 and 3/6). A PHY can be connected to the
TO PHY connector to pass data through to the data pairs
along with PoE. LED drive and power management pins
are also brought out for additional board functions. The
board is set up for AC disconnect, but can be reworked
for DC disconnect by removing components and replac-
ing with shorts in certain locations. Tw osolder jumpers
also provide selectable options for legacy detection and
class enforce.
Power Management
The midspan and endpoint PSEs, although separate solu-
tions on the DC981, are tied together at the PWRMGT pin
for demonstration of the LTC4263 power management
capability. Programmable onboard power management
circuitry allows multiple LTC4263s to allocate and share
powerinmultiportsystems, allowing maximumutilization
of the 48V power supply – all without the intervention of
a host processor.
The LTC4263 sources current (IPM) at the PWRMGT pin
proportional to the class of the PD that it is powering. The
voltage of this pin (VPM) is checked before powering the
port (Table 2). The port will not turn on if this pin is more
than 1V above VSS. The PWRMGT pins of the LTC4263s
are tied together and connect to a resistor (RPM) and
capacitor (CPM) in parallel to VSS to implement power
management. This resistor is selected with the following
equation:
RPM = 213kΩ • W/PFULL_LOAD
On the DC981A, the default RPM is 12.4kΩ for a full load
power of 17W.
Table 2. Power Management Voltage
PD CLASS POWER
REQUEST
IPM (TYP) VPM*
Class 1 4W 19μA 236mV
Class 2 7W 33μA 409mV
Class 0, 3, or 4 15.4W 73μA 905mV
*RPM = 12.4kΩ
operating principles

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dc981abf
DEMO MANUAL
DC981A/DC981B
Table 3. Powered Device Combinations
PD COMBINATION 1ST PD 2ND PD
Class 1 / Class 1 Powered Powered
Class 1 / Class 2 Powered Powered
Class 1 / Class 3** Powered Power Denied
Class 2 / Class 2 Powered Powered
Class 2 / Class 3** Powered Power Denied
Class 3 **/ Class 3** Powered Power Denied
**Class 3 substitutable with Class 0 or 4.
If power management is not used, move JP6 to DIS to tie
the PWRMGT pins to VSS and disable this feature.
Class Enforce Mode
ENFORCE CLASS jumper JP1 ties the ENFCLS pin of the
LTC4263 to either VDD5 or VSS to respectively enable or
disable class enforce current limits. If held at VDD5, the
LTC4263 will reduce the ICUT threshold for Class 1 or
Class 2 PDs. If ENFCLS is held at VSS, ICUT remains at
375mA (typical) for all classes.
Table 4. Port Current Limit According to Class
PD CLASS CURRENT THRESHOLD (TYPICAL)
Class 1 100mA
Class 2 175mA
Class 0, 3, 4, or Class
Enforce Disabled 375mA
LED Drive
An LED pin indicates the state of the port controlled by
the LTC4263. When the port is powered, the LED is on;
when disconnected or detecting, the LED is off. If an
invalid signature is detected or a fault occurs, the LED
will flash a pattern that the user or host system can read
to indicate the nature of the problem. When run from a
single 48V supply, the LED pin can operate as a simple
switching current source to reduce power dissipation in
the LED drive circuitry.
VDD5 Option
Thelogic5Vpowersupplycanbesuppliedfromtheinternal
LTC4263 5V supply or an external 5V supply when above
the internal supply. If the internal regulator is used, this
pin should only be connected to the bypass capacitor and
to logic pins of the LTC4263 held at VDD5.
AC and DC Disconnect
ACandDC disconnectaretwo different methodsofdetect-
ing whether a valid PD is present and requires power. AC
disconnect is the default method for the DC981 but can
be converted to DC disconnect in the midspan solution
through two jumpers. Moving DISCON (JP4) to DC will
shorttheACCOUTpintoVSSandconfiguretheLTC4263to
DC disconnect. Moving jumper setting for ACCOMP (JP5)
to DC bypasses the AC blocking diode and removes the
RC used for AC disconnect from the main circuit.
Legacy Detection
LEGACY jumper JP3 controls whether legacy detect is
enabled. If the LEGACY pin is held at VDD5 (EN selected),
legacy detect is enabled and testing for a large capacitor
is performed to detect the presence of a legacy PD on
the port. If held at VSS (DIS selected), only IEEE 802.3af
compliant PDs are detected. If left floating (no jumper),
theLTC4263entersforce-power-onmodeandanyPD that
generatesbetween 1Vand 10V when biased with 270μA of
detection current will be powered as a legacy device. This
mode is useful if the system uses a differential detection
scheme to detect legacy devices. Warning: Legacy modes
are not IEEE 802.3af compliant.
operating principles

5
dc981abf
DEMO MANUAL
DC981A/DC981B
operating principles
Figure 2. DC981 Options

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dc981abf
DEMO MANUAL
DC981A/DC981B
Dc981a layout
Top Silkscreen
Layer 1

7
dc981abf
DEMO MANUAL
DC981A/DC981B
Dc981a layout
Layer 2
Layer 3

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dc981abf
DEMO MANUAL
DC981A/DC981B
Dc981a layout
Layer 4
Silkscreen Bottom

9
dc981abf
DEMO MANUAL
DC981A/DC981B
Top Layer
Top Silkscreen
Dc981B layout

10
dc981abf
DEMO MANUAL
DC981A/DC981B
Dc981B layout
Bottom Layer
Bottom Silkscreen

11
dc981abf
DEMO MANUAL
DC981A/DC981B
parts list
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
DC981A-3 Required Circuit Components
1 1 CPM CAP, X5R, 1µF 16V, 10%, 0603 MURATA, GRM185R61C105KE44D
2 2 C1 CAP, X7R, 0.1µF 16V, 10%, 0603 MURATA, GRM188R71C104KA01D
3 2 C3, C4 CAP, X7R 0.1µF 100V, 10%, 0603 MURATA, GRM188R72A104KA35D
4 1 D1 DIODE, SWITCHING, SOT23 DIODES INC, BAS19-7-F
5 1 D2 DIODE, 58V TVS, SMA-DIODE DIODES INC, SMAJ58A-13
6 1 J4 JACK, POWER, RJ45-JK0-0144BNL PULSE, JK0-0144BNL
7 2 LED3, LED2 LED, GREEN, LED-ROHM, SML-010 ROHM, SML-010FTT86
8 1 L1 IND, PWR, 10000µH, L-COIL-DS1608C COILCRAFT, DS1608C-106MLC
9 1 RPM RES, CHIP 12.4k 1/16W 1%, 0805 VISHAY, CRCW080512K4FKEA
10 1 R1 RES, CHIP 2k 1/10W 5%, 0805 VISHAY, CRCW08052K00FKEA
11 1 R2 RES, CHIP 1k 1/16W 5%, 0603 YAGEO, RC0603FR-071KL
12 1 R3 RES, CHIP 10k 1/16W 5%, 0603 YAGEO, RC0603FR-0710KL
13 1 U1 IC, LTC4263CS, SO14 LINEAR TECHNOLOGY, LTC4263CS
Optional Circuit Components
1 1 C2 CAP, X7R 1000PF 2kV, 1206 MURATA, GR431BR7LA102KW01L
2 4 C5, C8, C11, C13 CAP, X7R, 0.1µF 16V, 10%, 0603 MURATA, GRM188R71C104KA01D
3 1 C6 CAP, ELECT, 4.7µF 63V, C-PANA-EEVFK-C PANASONIC, EEE-FK1J4R7R
4 2 C7, C12 CAP, X7R, 0.47µF 100V, 10%, 0805 MURATA, GRM21BR72A474KA73L
5 2 C9, C10 CAP, X7R 0.1µF 100V, 10%, 0603 MURATA, GRM188R72A104KA35D
6 2 D3, D5 DIODE, SHOTTKY, PICO MINI, SOT563 CENTRAL SEMI, CMLSH05-4
7 1 D4 DIODE, 58V TVS, SMA-DIODE DIODES INC, SMAJ58A-13
8 1 D6 DIODE, RECTIFIER 3A, SMB-DIDOE DIODES INC, S3BB-13-F
9 2 D8, D7 DIODE, 15V, ZENER, SOD323 CENTRAL SEMI, CMDZ15L
10 2 J6, J5 CONN, RJ-45 RIGHT ANGLE, RJ45 STEWART CONN SYS, SS-6488-NF-K1
11 1 LED1 LED, YELLOW, LED-ROHM, SML-010 ROHM, SML-010YTT86
12 2 R6, R8 RES, CHIP 1k 1/16W 5%, 0603 YAGEO, RC0603FR-071KL
13 1 R4 RES, CHIP 5.1k 1/16W 5%, 0603 AAC, CR16-512JM
14 2 R5, R7 RES, CHIP 510k 1/16W 5%, 0603 VISHAY, CRCW0603510KJNEA
15 1 SW1 SWITCH, PUSH BUTTON WÜRTH, 434 123 050 816
16 1 J3 SOCKET, 1X6, 0.079", VERTICAL SAMTEC, SQT-106-01-LM-S-004
17 1 U2 IC, LTC4263CDE, DFN14DE LINEAR TECHNOLOGY, LTC4263CS
Hardware for Demo Board Only
1 5 E1, E2, E9, E10, E11 TP, TURRET, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0
2 6 E3, E4, E5, E6, E7, E8 TP, TURRET, 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0
3 6 JP1, JP2, JP3, JP4, JP5, JP6 JMP, 1X3, 0.079" SAMTEC, TMM-103-02-L-S
4 0 JP7 JMP, 2X3, 0.079" OPT
5 6 FOR JP1 TO JP6 (1 and 2) SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G
6 2 J1, J2 JACK, BANANA, KEY-575 KEYSTONE, 575-4
7 4 MH1 TO MH4 STANDOFF, SNAP ON, 1/2" KEYSTONE, 8833

12
dc981abf
DEMO MANUAL
DC981A/DC981B
parts list
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
DC981B Required Circuit Components
1 2 C2, C1 CAP, X7R, 0.1µF 16V, 10%, 0603 MURATA, GRM188R71C104KA01D
2 2 C3, C4 CAP, X7R 0.1µF 100V, 10%, 0603 MURATA, GRM188R72A104KA35D
3 1 C5 CAP, X7R, 0.47µF 100V, 10%, 0805 MURATA, GRM21BR72A474KA73L
4 1 D1 DIODE, 58V TVS, SMA-DIODE DIODES INC, SMAJ58A
5 1 D2 DIODE, SCHOTTKY, PICO MINI, SOT563 CENTRAL SEMI, CMLSH05-4
6 1 J1 HEADER, 1X6, 0.079", SMT, HORIZONTAL SAMTEC, MMT-106-02-S-SH-004
7 1 R1 RES, CHIP 510kΩ 1/16W 5%, 0603 AAC, CR16-514JM
8 1 R2 RES, CHIP 1kΩ 1/16W 5%, 0603 AAC, CR16-102JM
9 1 U1 I.C., LTC4263CDE, DFN14DE LINEAR TECHNOLOGY, LTC4263CDE

13
dc981abf
DEMO MANUAL
DC981A/DC981B
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE 0603. NOTES: UNLESS OTHERWISE SPECIFIED 2. INSTALL SHUNTS ON JP1-JP6 PINS 1 AND 2.
46V-57V
MIDSPAN PSE
MIDSPAN OUT MIDSPAN IN
(EXTERNAL 5V SUPPLY OPTIONAL)
+
_
MIDSPAN ENFCLS LEGACY
VDD48
VDD48
VDD5
VDD5
VDD5
VDD5
VDD5
PM
VDD48
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
N/A
LTC4263CS / LTC4263CDE
Friday, September 26, 2014
12
MAIN BOARD, SINGLE PORT AUTONOMOUS PSE
KIM T.
DILIAN R.
3
DEMO CIRCUIT 981A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
N/A
LTC4263CS / LTC4263CDE
Friday, September 26, 2014
12
MAIN BOARD, SINGLE PORT AUTONOMOUS PSE
KIM T.
DILIAN R.
3
DEMO CIRCUIT 981A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
N/A
LTC4263CS / LTC4263CDE
Friday, September 26, 2014
12
MAIN BOARD, SINGLE PORT AUTONOMOUS PSE
KIM T.
DILIAN R.
3
DEMO CIRCUIT 981A
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
DILIAN R.PRODUCTION
__ 309-26-14
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
DILIAN R.PRODUCTION
__ 309-26-14
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
DILIAN R.PRODUCTION
__ 309-26-14
D6 S3BB D6 S3BB
2 1
E4
VDD5
E4
VDD5
J2
VSS
J2
VSS
C5 0.1UF C5 0.1UF
E6PWRMGT E6PWRMGT
CMDZ15L
15V
D8
CMDZ15L
15V
D8
2 1
SW1 SD SW1 SD
12
E1
VDD48
E1
VDD48
R2 1K R2 1K
J1
VDD48
J1
VDD48
C13 0.1UF C13 0.1UF
JP2
MIDSPAN
EN
DIS
JP2
MIDSPAN
EN
DIS
JP3
LEGACY
EN
DIS
JP3
LEGACY
EN
DIS
JP5
ACCOMP
JP5
ACCOMP
CPM 1UF CPM 1UF
+
C6 4.7UF 63V
EEVFK1J4R7R
PANASONIC
+
C6 4.7UF 63V
EEVFK1J4R7R
PANASONIC
D3
CMLSH05-4
D3
CMLSH05-4
4 31
2 5 6
E2
VSS
E2
VSS
R3
10K
R3
10K
LED2 GRN
MIDPSE
LED2 GRN
MIDPSE
2 1
R5
510K
R5
510K
E9
VOUT_MID
E9
VOUT_MID
J6
SS-6468-NF-K1
RJ45
J6
SS-6468-NF-K1
RJ45
1 2 3 4 5 6 7 8
CHS
CHS
R4
5.1K
R4
5.1K
CMDZ15L
15V
D7
CMDZ15L
15V
D7
2 1
D1
BAS19
D1
BAS19
1 3
L1
10000UH
DS1608C-106
COILCRAFT
L1
10000UH
DS1608C-106
COILCRAFT
12
C4 0.1UF
100V
C4 0.1UF
100V
E8
SD
E8
SD
SMAJ58A
D2
SMAJ58A
D2
2 1
C3
0.1UF 100V
C3
0.1UF 100V
E7LED E7LED
R6 1KR6 1K
U1 LTC4263CS U1 LTC4263CS
VSS
5
ACCOUT 8
LED 1
LEGACY
2
MIDSPAN
3
PWRMGT 4
OSC 7
VSS
6OUT 9
OUT 10
VDD48 11
SD
12
ENFCLS
13
VDD5
14
E11
VDD48
E11
VDD48
J5
SS-6468-NF-K1
RJ45
J5
SS-6468-NF-K1
RJ45
1 2 3 4 5 6 7 8
CHS
CHS
RPM 12.4K 0805 1% RPM 12.4K 0805 1%
JP1
ENFORCE CLASS
EN
DIS
JP1
ENFORCE CLASS
EN
DIS
E3
VSS
E3
VSS
C1 0.1UF C1 0.1UF
JP4
DISCON
AC DC
JP4
DISCON
AC DC
LED1
YELLOW
VDD48
LED1
YELLOW
VDD48
2 1
E5
VSS
E5
VSS
JP6
PWRMGT
EN
DIS
JP6
PWRMGT
EN
DIS
C7 0.47UF 0805 100V C7 0.47UF 0805 100V

14
dc981abf
DEMO MANUAL
DC981A/DC981B
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
ENDPOINT PSE OPTIONS
ENDPOINT PSE
TO PHY
OUT TO PD
TO
DAUGHTER
CARD
OPTIONAL ENDPOINT PSE LAYOUT
VO-
PM
VDD48
PM
VDD48
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
N/A
LTC4263CS / LTC4263CDE
Friday, September 26, 2014
22
MAIN BOARD, SINGLE PORT AUTONOMOUS PSE
KIM T.
DILIAN R.
3
DEMO CIRCUIT 981A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
N/A
LTC4263CS / LTC4263CDE
Friday, September 26, 2014
22
MAIN BOARD, SINGLE PORT AUTONOMOUS PSE
KIM T.
DILIAN R.
3
DEMO CIRCUIT 981A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
N/A
LTC4263CS / LTC4263CDE
Friday, September 26, 2014
22
MAIN BOARD, SINGLE PORT AUTONOMOUS PSE
KIM T.
DILIAN R.
3
DEMO CIRCUIT 981A
C11 0.1UF C11 0.1UF R8
1K R8 1K
C2
1000PF,2KV
1206
C2
1000PF,2KV
1206
R1 2K 0805 R1 2K 0805
R7
510K
R7
510K
C12 0.47UF 0805 100V C12 0.47UF 0805 100V
C9 0.1UF 0603 100V C9 0.1UF 0603 100V
D5
CMLSH05-4
D5
CMLSH05-4
4 31
2 5 6
U2 LTC4263CDE U2 LTC4263CDE
VSS
5
ACCOUT 8
LED 1
LEGACY
2
MIDSPAN
3
PWRMGT 4
OSC 7
VSS
6OUT 9
OUT 10
VDD48 11
SD
12
GND
15
ENFCLS
13
VDD5
14
E10
VOUT_EP
E10
VOUT_EP
1 2 3 4 5 6 7 8
J4
JK0-0044
1 2 3 4 5 6 7 8
J4
JK0-0044
TD+
1
CT
7
TD-
8
RD-
9
VC1+
5
RD+
2
VC1-
10
VC2+
6
VC2-
11
CHS
12
CHS
13
C8 0.1UF C8 0.1UF
SMAJ58A
D4
SMAJ58A
D4
2 1
JP7
HD2X3-079
OPT
JP7
HD2X3-079
OPT
1 3 5 6
4 2
J3
HD1X6-079
J3
HD1X6-079
VDD48 3
LED 6
PM 5
VO- 2
GND 1
X4
C10 0.1UF 0603 100V C10 0.1UF 0603 100V
LED3 GRN ENDPSE LED3 GRN ENDPSE
2 1

15
dc981abf
DEMO MANUAL
DC981A/DC981B
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
schematic Diagram

16
dc981abf
DEMO MANUAL
DC981A/DC981B
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014
LT 1214 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) provides the enclosed product(s) under the following AS IS conditions:
Thisdemonstration board (DEMO BOARD) kitbeing soldor providedby Linear Technology is intended foruse forENGINEERING 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. LT C 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 applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation