Linear Technology 1814A Quick setup guide

dc1814afe

DEMO MANUAL

DC1814A

Description

LTC4274A

Single LTPoE++ PSE Controller

Demonstration circuit 1814A features the LTC

4274A,

single port power sourcing equipment (PSE) controller,

capable of delivering up to 90W of LTPoE++

power to a

compatible LTPoE++ powered device (PD). A proprietary

detection/classification scheme allows mutual identifica-

tion between an LTPoE++ PSE and LTPoE++ PD while

remaining compatible and interoperable with existing

Type 1 (13W) and Type2 (25.5W) PDs. The LTC4274A

feature set is a superset of the popular LTC4274. These

PSE controllers utilize low RON external MOSFETs and

0.25Ω sense resistors which are especially important at

the LTPoE++ current levels to maintain the lowest possible

heat dissipation.

The LTC4274A is available in multiple power grades,

allowing delivered PD power of 13W, 25.5W, 38.7W,

52.7W, 70W and 90W. The DC1814A has four variations

DC1814A-A, DC1814A-B, DC1814A-C, and DC1814A-D

which accommodate the LTPoE++ power levels (Table 1).

L, LT, LTC, LTM, LTPoE++, Linear Technology and the Linear logo are registered trademarks of

Linear Technology Corporation. All other trademarks are the property of their respective owners.

The LTC4274A is configured in the DC1814A as an AUTO

pinhigh,MIDpinhigh,autonomousmidspanpowerinjec-

tor;inputdata from anexistingnetworksystem is sentout,

along with power

, to a PD. The LTC4274A autonomously

detects a PD, turns power on to the port, and disconnects

port power without the need for a microcontroller. A single

55V supply is required to power the DC1814A. A simple

LDO regulator circuit on the board powers the digital sup-

ply of the LTC4274A. A SHDN pushbutton shuts down the

port and disables detection. A RESET pushbutton resets

the LTC4274A to the AUTO pin high state.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1814A

Table 1. DC1814A Power Levels

DEMO BOARD PSE CONTROLLER MAXIMUM DELIVERED PD POWER POWER SUPPLY*

DC1814A-A LTC4274A-1 38.7W 72W

DC1814A-B LTC4274A-2 52.7W 72W

DC1814A-C LTC4274A-3 70W 120W

DC1814A-D LTC4274A-4 90W 140W

*Recommended DC1814A power supply minimum to avoid drooping in a worst-case scenario with ILIM current at the port. Set the voltage between

54.75V to 57V for LTPoE++ compliance.

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dc1814afe

DEMO MANUAL

DC1814A

Quick start proceDure

Figure 1. DC1814A Setup

Demonstration circuit 1814A is easy to set up for evaluat-

ing the performance of the LT C4274A. Refer to Figure 1

for proper test equipment setup and follow the procedure

below.

1. Connect a 55V to 57V power supply across AGND (+)

and VEE (–). Size the power supply considering the

maximum power delivered to the PD.

2. Connectan802.3Type1orType2,orLTPoE++compat-

ible PD to RJ45 connector J1 with an Ethernet cable.

3. Measure the port output voltage to the PD across

VPORT+ and VPORT– test points.

4. (Optional) Connect a PHY to RJ45 connector J2 with

an Ethernet cable for data tests.

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dc1814afe

DEMO MANUAL

DC1814A

BoarD Layout

Proper components placement and board layout with

respect to the LTC4274A is important to provide electrical

robustnessandcorrectoperation.Thefollowingmentioned

components,also showninFigure2,mustbeclosetotheir

respective LTC4274A pins with no other components in

between on the connection path. Place a 0.1µF capacitor

(C1) directly across the LTC4274A VDD and DGND pins.

Place a 1µF, 100V capacitor (C4) and a SMAJ58A TVS (D3)

directly across the LTC4274A AGND and VEE pins. Place

a 0.22µF, 100V capacitor (C5) directly to the OUT pin and

an AGND plane.

The power path is from VEE to the sense resistor, to the

MOSFET, and out to the port. Select a trace width appro-

priate for the maximum current.

Kelvin sensing is necessary to provide accurate current

readings.Thesenseresistorusedwith theLTC4274Amust

be 0.25Ω, 1% or better, and with a power rating that can

handle the maximum DC current passed through it. A

dedicatedsensetracefromtheSENSEpinoftheLT C4274A

must go directly to the sense resistor solder pad. Avoid

connecting to copper cutouts and other traces. The VEE

side of the sense resistor must also connect to the VEE

pins of the LTC4274A either through a direct trace (Figure

3A), or a VEE copper plane (Figure 3B), without any other

components in between on this connection.

Figure 2. LTC4274A Key Application Components for Board Placement

Figure 3. LTC4274IUHF VEE and SENSE Kelvin Connection to Sense Resistor

LTC4274AIUHF

AGND

SENSE

GATE

OUT

VEE

VDDVDD

VEE

DGND

0.1µF

DGND

0.1µF

100V

OUT

DC1814A F02

0.22µF

100V

FDMC86102

RS1

0.25Ω

CSRN2512FKR250

SMAJ58A

18 2219 25 26 27 39 30 31 32

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dc1814afe

DEMO MANUAL

DC1814A

Figure 4. DC1814A LDO Circuit for the LTC4274A Digital Supply

LTC4274AIUHF

AGND

VEE

VDD

VEE

0.1µF

D23

5.6V

100k

CMPTA92

DGND

R10

1Ω

DGND

DC1814A F04

18 2219 25 26 27 39

3.8V

MMSZ4686T1

R11

1/4W

suppLy VoLtages

Select a VEE supply with enough power to sustain the port

at maximum load. Table 1 shows the maximum delivered

PD power as well as a recommended VEE power supply

minimum to avoid drooping in a worst case scenario with

ILIM current.

The LTC4274A also requires a digital 3.3V supply. The

DC1814A uses a simple LDO regulator circuit to power the

3.3VdigitalsupplyfromtheVEEsupply.TheLTC4274AVDD

supplyis allowedtobe within5Vabove orbelowAGND. On

theDC1814A, VDD is tied toAGND and DGND is anegative

voltage below AGND. D1, R5, Q2, and R11 generate the

negative voltage referenced to AGND (Figure4). These

components are sized to handle the power required to

supply the LTC4274A and LEDs on the DC1814A. Contact

Linear Technology Applications for 3.3V options.

Surge Protection

Ethernet ports can be subject to significant cable surge

events.To keepPoEvoltagesbelowa safelevelandprotect

the application against damage, protection components

are required at the main supply, at the LT C4274A supply

pins and at the port. Refer to Figure 5.

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. Across the LTC4274A AGND pin and VEE

pin are an SMAJ58A, 58V TVS and a 1μF, 100V bypass

capacitor. These components must be placed close to the

LTC4274A pins.

Inahighsurgeenvironment,a 10Ω,0805resistorinseries

from supply AGND to the LTC4274A AGND and VDD pin is

recommended. The bulk TVS and capacitance remain on

the supply side of this 10Ω resistor. The LT C4274A supply

pins local TVS and capacitance remain at the LTC4274A

side of this 10Ω resistor.

The port requires a pair of S1B clamp diodes:one from

OUT to supply AGND and one from supply VEE to OUT. 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.

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dc1814afe

DEMO MANUAL

DC1814A

LTC4274AIUHF

AGND

SENSE

GATE

OUT

VEE

VDD

VEE

0.1µF

D23

5.6V

CMPTA92

100k

R10

1Ω

10Ω

0805

DGND

CBULK

VEE

TVSBULK

1µF

100V

OUT

VEE

DC1814A F05

0.22µF

100V

FDMC86102

RS1

0.25Ω

CSRN2512FKR250

SMAJ58A

18 2219 25 26 27 39 30 31 32

S1B

3.9V

MMSZ4686T1

R11

1/4W

Figure 5. High Surge Environment Recommended LTC4274A Protection

suppLy VoLtages

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dc1814afe

DEMO MANUAL

DC1814A

pcB Layout

Layer 1. Top LayerTop Silkscreen

Layer 2. –VIN 1 Layer 3. –VIN 2

Layer 4. Bottom Layer Bottom Silkscreen

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dc1814afe

DEMO MANUAL

DC1814A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

1 1 C1 CAP, 0603 0.1µF 10% 25V X7R TDK C1608X7R1E104K (BAL. FR#1807)

2 1 C2 CAP, 4.7µF 20% 63V ALUM. PANASONIC, EEEFK1J4R7R

3 1 C5 CAP, 1206 0.22µF 20% 100V X7R AVX 12061C224MAT

4 1 C4 CAP, 1210 1.0µF 10% 100V X7R AVX, 12101C105KAT

5 2 C3, C6 CAP, 1808 1000pF 10% 2KV X7R TDK C4520X7R3D102K

6 4 CT1-CT4 CAP, 0805 0.01µF 5% 100V X7R AVX 08051C103JAT

7 2 D4, D5 DIODE, RECTIFIER, 100V 1A, SMA VISHAY S1B

8 1 D3 DIODE, TVS 58V 400W SMA DIODES INC., SMAJ58A-13-F

9 1 D2 DIODE, TVS, 64V 600W SMB DIODES INC., SMBJ64A-13-F

10 1 D1 DIODE, ZENER 3.9V SOD-123 ON SEMI MMSZ4686T1G

11 1 D23 DIODE, ZENER 5.6V 5% SOT23 FAIRCHILD, BZX84C5V6

12 4 E1-E4 TESTPOINT, TURRET, 0.094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0

13 4 F7-F10 FUSE, 3A, 63VDC 1206 BEL FUSE C1Q 3

14 2 J3, J4 CONN, JACK, BANANA KEYSTONE 575-4

15 2 J1, J2 CONN, RJ45, SINGLE PORT STEWART CONN., SS-7188S-A-NF

16 1 R10 RES, 0603 1.0Ω 5% 1/10W VISHAY CRCW06031R00JNEA

17 4 R6-R9 RES, 0603 10k 5% 1/10W YAGEO, RC0603JR-0710KL

18 1 R5 RES, 0603 100k 5% 1/10W YAGEO, RC0603JR-07100KL

19 8 R1-R4, RT1-RT4 RES, 0603 75Ω 5% 1/10W YAGEO, RC0603JR-0775RL

20 1 R11 RES, THICK FILM 0805 1.0k 5% 1/4W PANASONIC, ERJ-P06J102V

21 1 RS1 RES, 2512 0.25Ω 1% 2W STACKPOLE, CSRN2512FKR250

22 4 MH1-MH4 STAND-OFF, NYLON 0.75" KEYSTONE, 8834(SNAP ON)

23 2 SW1, SW2 SWITCH, MOMENTARY PUSHBUTTON WÜRTH, 434 123 050 816

24 1 Q1 XSTR, MOSFET, N-CHANNEL 100V 2.3A POWER-33 FAIRCHILD FDMC86102

25 1 Q2 XSTR, PNP, 300V 500MA SOT23 CMPTA92 CENTRAL SEMI CMPTA92

26 1 T1 XFMR, POE+ 1.5A

(Option) WÜRTH ELECTRONICS, 749022016

COILCRAFT ETH1-460L

DC1814A-A

1 1 DC1814A GENERAL BOM

2 4 FB1-FB4 FERRITE BEAD, 1k, 0805 TDK MPZ2012S102A

3 1 U1 IC, LTC4274A-1, SINGLE PORT 38.7W PSE CONTROLLER LINEAR LTC4274AIUHF-1

4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1814A

DC1814A-B

1 1 DC1814A GENERAL BOM

2 4 FB1-FB4 FERRITE BEAD, 1k, 0805 TDK MPZ2012S102A

3 1 U1 IC, LTC4274A-2, SINGLE PORT 52.7W PSE CONTROLLER LINEAR LTC4274AIUHF-2

4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1814A

DC1814A-C

1 1 DC1814A GENERAL BOM

2 4 FB1-FB4 FERRITE BEAD, 1k, 0805 TDK MPZ2012S102A

3 1 U1 IC, LTC4274A-3, SINGLE PORT 70W PSE CONTROLLER LINEAR LTC4274AIUHF-3

4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1814A

DC1814A-D

1 1 DC1814A GENERAL BOM

24 FB1-FB4 FERRITE BEAD, 1300Ω, 1812 TAIYO YUDEN FBMH4532HM132-T

3 1 U1 IC, LTC4274A-4, SINGLE PORT 90W PSE CONTROLLER LINEAR LTC4274AIUHF-4

4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1814A

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dc1814afe

DEMO MANUAL

DC1814A

schematic Diagram

DATA AND POWER OUT

VEE

AGND

MAIN PS

INPUTS

(+)

(-)

(55V TO 57V)

DATA IN

CSRN2512FKR250

RESET

SHDN

MMSZ4686T1

1/4W

VDD

DGND

TP2

TP1

SDA

SCL

ASSEMBLY VERSION -WATT PSE U1

-A 38.7W LTC4274AIUHF-1

-B 52.7W LTC4274AIUHF-2

-C 70W LTC4274AIUHF-3

-D 90W LTC4274AIUHF-4

MPZ2012S102A

FBMH4532HM132-T

NOTE: FOR TEMPERATURE SENSITIVE 90W

APPLICATIONS, TWO OF THE 749012013 MAY BE

USED AS AN ALTERNATE TO T1 WHICH HAS A

HIGHER CURRENT RATING

VPORT +

VPORT -

PRODUCTION DILIAN R. 4/29/11

2. INSTALL SHUNTS AS SHOWN.

1. ALL RESISTORS ARE IN OHMS, 0603.

ALL CAPACITORS ARE IN MICROFARADS, 0603.

NOTE: UNLESS OTHERWISE SPECIFIED

MPZ2012S102A

FB1, FB2, FB3, FB4

SEE TABLE

_POWER LEVEL UPDATE DILIAN R. 9/26/11

T1: WURTH 749022016

COILCRAFT ETH1-460L

_T1 OPTION DILIAN R. 3/28/13

FOR HIGH SURGE ENVIRONMENTS

ADD A 10 OHM, 0805 RESISTOR

AT THIS LOCATION

1c SURGE RESISTOR DILIAN R. 12/8/15

VEE

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 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

Tuesday, December 08, 2015

SINGLE PORT LTPoE++ PSE CONTROLLER

DILIAN R.

N/A

LTC4274AIUHF FAMILY

DEMO CIRCUIT 1814A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 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

Tuesday, December 08, 2015

SINGLE PORT LTPoE++ PSE CONTROLLER

DILIAN R.

N/A

LTC4274AIUHF FAMILY

DEMO CIRCUIT 1814A

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 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

Tuesday, December 08, 2015

SINGLE PORT LTPoE++ PSE CONTROLLER

DILIAN R.

N/A

LTC4274AIUHF FAMILY

DEMO CIRCUIT 1814A

FB3

10K

RT4

SS-7188S-A-NF

CT2 0.01uF

100V

0805

0.22uF

100V

D23

5.6V

1 3

3.9V

1000pF

2kV

LTC4274AIUHF

SDAOUT 1

SDAIN 3

SCL 38

AD0 7

AD1 6

AD2 5

AD3 4

AGND

VEE

SENSE

GATE

OUT

INT 37

SHDN 14

DGND

17 DGND

16 DGND

15 DGND

VDD

AUTO

MID

RESET 35

MSD 34

NC 2

NC 11

NC 12

NC 20

NC 21

NC 23

NC 24

NC 28

NC 29

DNC 8

NC 9

100K

3A, 1206

C1Q 3

RT1

SMAJ58A

1.0uF

100V

F10

3A, 1206

C1Q 3

RS1 0.25

S1B

FB2

10K

R11

1.0K

CT3 0.01uF

100V

0805

R10

3A, 1206

C1Q 3

CT1 0.01uF

100V

0805

SMBJ64A

3A, 1206

C1Q 3

RT3

10K

1000pF

2kV

223

CMPTA92

FB1

S1B

10K

FDMC86102

0.1uF

4.7uF

63V

SS-7188S-A-NF

SW1

1 2

SW2

1 2

CT4 0.01uF

100V

0805

RT2

FB4

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dc1814afe

DEMO MANUAL

DC1814A

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.

assemBLy Drawing

dc1814afe

DEMO MANUAL

DC1814A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2011

LT 0116 REV E • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

Thisdemonstration board (DEMO BOARD)kitbeing sold orprovidedby Linear Technologyis intended for useforENGINEERING 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 applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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