Linear Technology DC2475A-A Demo Manual

DEMO MANUAL

DC2475A-A

LT4295, LT4321

High Efficiency IEEE802.3bt (PoE

40W) PD with PoE Ideal Diode Bridge

Description

Demonstration circuit 2475A-A is an IEEE802.3bt (Draft 2.0) compliant Power over Ethernet (PoE) powered device(PD). It features the LT controller with the LT4321 PoE ideal diode bridge controller.

The LT4295 provides IEEE802.3af (PoE, Type 1), IEEE802.3at (PoE+, Type 2), and IEEE802.3bt (PoE++, Type3 and 4) compliant interfacing and power supply control. It utilizes an external, low R cal) N-channel FET for the Hot Swap function to improve efficiency. The utilizes a highly efficient flyback topology with synchro nous rectification.

The LT4321 controls eight low R N-channel FETs to further improve end-to-end power

®

4295 PD interface and switching regulator

(57mΩ typi-

DS(ON)

LT4295 controls a DC/DC converter that

-

(57mΩ typical)

DS(ON)

++

, Type

3,

delivery efficiency and ease thermal design. This solution replaces the eight diodes typically found in a passive PoE rectifier bridge.

The DC2475A-A accepts up to 40W of delivered power from a power sourcing equipment (PSE) via the RJ45 connector (J1) or a local 48VDC power supply using the auxiliary supply input. When both supplies are connected, the auxiliary supply input has priority over the PoE input. The DC2475A-A supplies a 12V output at up to 3A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2475A-A

L, LT, LTC, LTM, Linear Technology, the Linear logo and LTPoE++ are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners.

performance summary

PARAMETER CONDITIONS VALUE

Port Voltage (V

Auxiliary Voltage From AUX

Output Voltage (V

Output Current (I

Output Voltage Ripple V

Load Regulation ±0.1% (Typical)

Efficiency V

Switching Frequency 250kHz (Typical)

) At RJ45 37V to 57V

PORT

) 12V (Typical)

OUT

) 3A (Max)

OUT

PORT

+

to AUX– Terminals 37V to 57V

= 44V, I

= 50V, I

= 3A 85mV

OUT

= 3A, End-to-End 92% (Typical)

OUT

(Typical)

P-P

BoarD photo

Top Side

Bottom Side

dc2475aafb

1

DEMO MANUAL

LOAD CURRENT (A)

0

0.511.522.5

3010

2030405060708090100

EFFICIENCY (%)

DC2475AA F02

LOAD CURRENT (A)

0

0.511.522.5

3

11.80

11.85

11.90

11.95

12.00

12.05

12.10

12.15

12.20

V

OUT

(V)

DC2475AA F03

DC2475A-A

typicaL performance characteristics

Top Side

Figure 1. Thermal Pictures (Conditions: V

V

PORT

44V

50V 57V

Figure 2. Efficiency (End-to-End)

PORT

Bottom Side

= 44V, V

OUT

= 12V, I

Figure 3. Load Regulation

OUT

= 3A)

V

PORT

44V

50V 57V

2

dc2475aafb

typicaL performance characteristics

DEMO MANUAL

DC2475A-A

Figure 4. Switch Node Waveforms (Conditions: V

PORT

= 57V, V

OUT

= 12V, I

OUT

= 3A)

Figure 5. Output Voltage Ripple (Conditions: V

PORT

= 44V, V

OUT

= 12V, I

OUT

= 3A)

dc2475aafb

3

DEMO MANUAL DC2475A-A

typicaL performance characteristics

Figure 6. Load Transient Response (Conditions: V

= 44V, Load Step: 1.5A to 3A to 1.5A)

PORT

Figure 7. Gain and Phase Margin of the Flyback DC/DC Converter (Conditions: V

CROSSOVER FREQUENCY (kHz) GAIN MARGIN (dB) PHASE MARGIN (deg)

5 20 64

4

PORT

= 44V, V

OUT

= 12V, I

OUT

= 3A)

dc2475aafb

QuicK start proceDure

DEMO MANUAL

DC2475A-A

Power over Ethernet (PoE) Input

1. Disconnect auxiliary supply if it is connected to AUX+ and AUX– inputs of the DC2475A-A.

2. Place and connect test equipment (voltmeter, ammeter, oscilloscope, and electronic load) as shown in Figure8.

3. Turn down the electronic load to a minimum value and turn off the electronic load.

4. Connect the output of the IEEE 802.3bt compliant PSE to the RJ45 connector (J1) of the DC2475A using a CAT5e or CAT6 Ethernet cable. (See note.)

5. After the LED (D4) on the DC2475A is lit, check the output voltage using a voltmeter. Output voltage should be within 12.0V ± 0.2V.

+

DC POWER

SUPPLY

+

IEEE 802.3bt

PSE

CAT5e

OR CAT6

CABLE

6. Turn on the electronic load and increase its load current up to 3A. Observe the output voltage regulation, efficiency, and other parameters.

Verify T2P response with an oscilloscope as shown in

7. Figure 8. The T2P response to the type of PSE connected to the DC2475A-A is provided in Table 1.

Note: An 802.3bt PSE has not yet been released. In

®

++

the interim, an LTPoE

compliant PSE (DC1814A-B) may be used to provide power to the DC2475A-A. The LTPoE++ classification will not be 802.3bt compliant, but the PSE will provide a compatible detection and power output. Specifically, the T2P output of the DC2475A-A is different from the behavior stated in Table 1 and will indicate connection to a Type 2 PSE. Otherwise PD behavior will be unaffected.

–

Table 1. T2P Response vs PSE Type

PSE T2P RESPONSE NEGOTIATED PD INPUT POWER

IEEE

LTPoE++, 52.7W Logic Low 40W

J1

Figure 8. Setup Diagram for PoE Input

Logic High 13W

Logic Low 25.5W

50% Logic High/50% Logic Low, Toggle at 976Hz ±7% 40W

+

VOLTMETER

–

OSCILLOSCOPE

+

ELECTRONIC

LOAD

–

+

AMMETER

–

dc2475aafb

5

DEMO MANUAL DC2475A-A

QuicK start proceDure

Auxiliary Supply Input

1. Place and connect test equipment (voltmeter, ammeter, oscilloscope, and electronic load) as shown in Figure9.

2. Turn down the electronic load to a minimum value and turn off the electronic load.

3. Connect the output of the auxiliary supply to the DC2475A as shown in Figure 9. Turn on the auxiliary supply and set its current limit to 2A. Then increase its output voltage to 48V.

J1

4. Once the LED (D4) on the DC2475A is lit, check the output voltage using a voltmeter. Output voltage should be within 12.0V ± 0.2V.

5. Turn on the electronic load and increase its load cur

rent up to 3A. Observe the output voltage regulation, efficiency, and other parameters.

Verify T2P response with an oscilloscope as shown

6.

in Figure 9. The T2P response during auxiliary power operation is provided in Table 2.

+

ELECTRONIC

LOAD

–

+

VOLTMETER

–

+

AMMETER

–

+

AUXILIARY SUPPLY

Table 2. T2P Response During Auxiliary Power Operation

75% Logic High/25% Logic Low, Toggle at 976Hz ±7% 36

–

Figure 9: Setup Diagram for Auxiliary Supply Input

T2P RESPONSE PD OUTPUT POWER (W)

–

OSCILLOSCOPE

+

dc2475aafb

6

DEMO MANUAL

DC2475A-A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC2475A General BOM

1 1 CG1 CAP, CER, X7R 1000pF 2kV 10% 1808 MURATA GR442QR73D102KW01L

2 1 CG2 CAP, CER, X7R 0.01µF 100V 20% 1206 AVX 12061C103MAT2A

3 0 C1 CAP, CER, OPT 2kV 1812 OPT

4 0 C5 CAP, CER, X7U OPT 6.3V 10% 1210 OPT

5 1 C6 CAP, ELEC, 10µF 100V 10% 6.3x7.7 SUNCON 100CE10BS

6 1 C7 CAP, CER, X7R 2.2µF 100V 10% 1210 MURATA GRM32ER72A225KA35

7 1 C10 CAP, CER, X7R 10nF 100V 20% 0603 MURATA GRM188R72A103KA01D

8 1 C11 CAP, CER, X7R 0.047µF 100V 20% 0603 KEMET C0603C473M1RACTU

9 1 C12 CAP, CER, X7R 0.047µF 100V 10% 0805 MURATA GRM21BR72A473KA01L

10 1 C13 CAP, CER, X7R 10µF 10V 10% 1206 MURATA GRM31CR71A106KA01L

11 0 C15, C18, C19, C21 CAP, CER, X5R OPT 2kV 20% 1812 OPT

12 1 C17 CAP, CER, X7R 1µF 25V 10% 0603 MURATA GRM188R71E105KA12

13 1 C20 CAP, CER, X7R 2.2nF 25V 10% 0603 MURATA GRM188R71E222KA01

14 1 C23 CAP, CER, X7R 4.7nF 2kV 1812 MURATA GR443DR73D472KW01L

15 1 C26 CAP, CER, X7R 100pF 16V 0402 AVX, 0402YC101KAT2A

16 0 C27 CAP, CER, X7R OPT 6.3V 10% 0402 OPT

17 1 D1 DIODE, SCHOTTKY, B2100 100V SMB DIODES INC B2100-13-F

18 1 D2 DIODE, TVS, PTVS58VS1UR 58V SOD123 NXP PTVS58VS1UR

19 1 D3 DIODE, ZENER, MMSZ5252BS 24V SOD323 DIODES INC MMSZ5252BS

20 1 D4 DIODE, LED GREEN ROHM SML-010FTT86L

21 1 D13 DIODE, SCHOTTKY, NXP, BAT46W 100V SOD323 NXP BAT46WJ,115

22 1 D15 DIODE, DIODE INC, BAV19WS 120V SOD323 DIODE INC BAV19WS

23 1 D16 DIODE, TVS, PTVS58VS1UR 58V SOD123 NXP PTVS58VS1UR

24 1 D17 DIODE, SCHOTTKY, PMEG1020EA 10V SOD323 NXP PMEG1020EA

25 1 D19 DIODE, TVS, PTVS58VS1UR 58V SOD123 NXP PTVS58VS1UR

26 7 E1, E2, E3, E4, E9, E10,

E12

27 1 J1 CONN, INTEGRATED JACK, 7499511001 WURTH 7499511001A

28 1 J2 CONN, RJ45 JACK, SS-6488-NF-K1 STEWART CONNECTOR SS-6488-NF-K1

29 1 L2 IND, 10µH COILCRAFT DO1608C-103

30 1 L4 IND, 100µH COILCRAFT DO1608C-104

TP, TURRET, PAD150-094 0.094" MILL-MAX 2501-2-00-80-00-00-07-0

ALTERNATE SS-6488S-A-NF

dc2475aafb

7

DEMO MANUAL DC2475A-A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

31 9 Q1, Q11, Q12, Q13,

Q14, Q15, Q16, Q17, Q18

32 1 Q5 TRANSISTOR, PNP, MMBT3906 40V SOT23 FAIRCHILD MMBT3906

33 1 Q6 TRANSISTOR, NPN, MMBT3904 40V SOT23 FAIRCHILD MMBT3904

34 1 Q7 TRAN, PNP, FMMT723 100V SOT23 DIODES INC FMMT723TA

35 0 Q7 (ALTERNATE) TRAN, PNP, PBSS9110T 100V SOT23 NXP PBSS9110T

36 4 RT1, RT2, RT3, RT4 RES, CHIP, 75Ω 5% 0603 NIC NRC06J750TRF

37 1 R5 RES, CHIP, 8.2Ω 5% 0805 NIC NRC10J8R2TRF

38 1 R6 RES, CHIP, 3.3k 5% 0603 NIC NRC06J332TRF

39 1 R7 RES, CHIP, 20Ω 5% 0805 VISHAY CRCW080520R0JNEA

40 1 R12 RES, CHIP, 0Ω 5% 0603 NIC NRC06ZOTRF

41 1 R13 RES, CHIP, 100Ω 5% 0603 VISHAY CRCW0603100RFKEA

42 1 R15 RES, CHIP, 15Ω 5% 0603 NIC NRC06J150TRF

43 1 R17 RES, CHIP, 2.00k 1% 0603 NIC NRC06F2001TRF

44 1 R18 RES, CHIP, 10k 5% 0603 YAGEO RC0603JR-0710KL

45 1 R21 RES, CHIP, 174k 1% 0603 VISHAY CRCW0603174KFKEA

46 1 R22 RES, CHIP, 107k 1% 0603 NIC NRC06F1073TRF

47 1 R27 RES, CHIP, 0Ω 5% 0402 NIC NRC04ZOTRF

48 1 R28 RES, CHIP, 0Ω 5% 0603 NIC NRC06ZOTRF

49 1 R29 RES, CHIP, 52.3k 1% 0603 VISHAY CRCW060352K3FKEA

50 0 R32 RES, CHIP, OPT 5% 1812 OPT

51 1 T3 XFMR, SMD GATE DRIVE, PE-68386NL PULSE PE-68386NL

52 0 T3 (ALTERNATE) XFMR, SMD GATE DRIVE, EPA4271GE PCA EPA4271GE

53 1 U3 IC, PoE IDEAL BRIDGE CONTROLLER, LT4321IUF QFN16 LINEAR TECH LT4321IUF#PBF

54 2 STENCIL (TOP AND BOTTOM) STENCIL DC2475A

DC2475A-A

1 DC2475A – GENERAL BOM

1 1 C2 CAP, CER, X5R 10µF 16V 10% 1206 MURATA GRM31CR61C106KA88

2 1 C3 CAP, CER, X5R 10µF 16V 10% 1206 MURATA GRM31CR61C106KA88

3 1 C4 CAP, ELEC, 33µF 25V 20% 5.0X5.8 PANASONIC EEHZA1E330R

4 1 C8 CAP, CER, U2J 470pF 630V 5% 1206 MURATA GRM31A7U2J471JW31D

5 1 C9 CAP, CER, U2J 100pF 630V 5% 1206 MURATA GRM31A7U2J101JW31D

6 1 C16 CAP, CER, X7R 1µF 25V 10% 0805 MURATA GRM21BR71E105KA99L

7 1 C22 CAP, CER, X7R 3.3nF 25V 10% 0603 AVX 06033C332KAT2A

8 1 C24 CAP, CER, X7R 0.1µF 25V 20% 0603 MURATA GRM188R71E104KA01D

9 1 C25 CAP, CER, X7R 220pF 25V 10% 0603 AVX 06033C221KAT4A

10 0 D18 DIODE, DIODE INC, OPT 40V SOD323 DIODE INC OPT

11 1 E11 TP, TURRET, PAD150-094 0.094" MILL-MAX 2501-2-00-80-00-00-07-0

12 1 L1 IND, 180nH COILCRAFT DO1813P-181HC

13 1 L3 IND, CMC, 1mH WURTH 744 272 102

MOSFET, N-CH, PSMN075-100MSE 100V LFPAK33 NXP PSMN075-100MSE

8

dc2475aafb

DEMO MANUAL

DC2475A-A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

14 1 Q2 MOSFET, N-CH, 100V TSON TOSHIBA TPN1600ANH

15 0 Q3 MOSFET, N-CH, OPT SOT23 OPT

16 1 Q4 MOSFET, N-CH, 200V TDSON-8 INFINEON BSZ900N20NS3

17 1 R2 RES, CHIP, 1.5k 5% 0805 NIC NRC10J152TRF

18 1 R3 RES, CHIP, 200Ω 5% 1206 NIC NRC12F2000TRF

19 1 R4 RES, CHIP, 200Ω 5% 1206 NIC NRC12F2000TRF

20 1 R8 RES, CHIP, 27Ω 5% 1206 VISHAY CRCW120627R0JNEA

21 1 R9 RES, CHIP, 27Ω 5% 1206 VISHAY CRCW120627R0JNEA

22 1 R10 RES, CHIP, 6.65k 1% 0603 NIC NRC06F6651TRF

23 1 R11 RES, CHIP, 7.50k 1% 0603 VISHAY CRCW06037K50FKEA

24 1 R14 RES, CHIP, 25mΩ 1% 1206 VISHAY WSL1206R0250FEA

25 1 R16 RES, CHIP, 0Ω, SHUNT, 0805 VISHAY CRCW08050000Z0EA

26 1 R19 RES, CHIP, 37.4Ω 1% 0805 VISHAY CRCW080537R4FKEA

27 1 R20 RES, CHIP, 1.00Ω 1% 0805 VISHAY CRCW08051K00FKEA

28 0 R23 RES, CHIP, OPT 5% 0603 OPT

29 1 R24 RES, CHIP, 26.1k 5% 0603 VISHAY CRCW060326K1FKEA

30 1 R25 RES, CHIP, 10k 5% 0603 YAGEO RC0603JR-0710KL

31 1 R26 RES, CHIP, 5.1k 5% 0603 YAGEO RC0603JR-075K1L

32 0 R30 RES, CHIP, OPT 5% 0805 OPT

33 0 R31 RES, CHIP, SHUNT, 2512 OPT

34 1 T1 XFMR, FLYBACK TRAN, 750316115 WURTH 750316115

35 0 T1 (ALTERNATE) XFMR, FLYBACK TRAN, EPC3634G PCA EPC3634G

36 0 T2 XFMR, FLYBACK TRAN, OPT OPT

37 1 U1 IC, PD AND SWITCHER CONTROLLER, LT4295IUFD QFN28 LINEAR TECH LT4295IUFD

38 1 U2 IC, TRANSISTOR OUTPUT OPTOCOUPLER, SO-8 FAIRCHILD SEMI, MOC207M

39 4 MH1-MH4 STAND-OFF, NYLON 0.50" TALL (SNAP ON) KEYSTONE 8833

40 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2475A

dc2475aafb

9

DEMO MANUAL

12

DC2475A-A

schematic Diagram

2

+VOUT

E2

D4

LED

1.5K

2512

+VOUT

180nH

L1

T1

KAUNG H.

COILCRAFT

DO1813P-181HC

VSEC_P

91310

750316115

VAUX_P

L2

HSS

Q1

D1

B2100

2 1

R2

C5

OPT

C4

33uF

25V

+

EEHZA1E330R

C3

10uF

X5R

16V

1206

C2

X5R

16V

1206

10uF

6

728

5

R4

1206

200

R3

200

1206

VPRI_P

R7200805

2.2uF

C7

10uH

Coilcraft

DO1608C-103

10uF

C6

+

123

PSMN075-100MSE

64587

1

R31

OPT

C1

2

3

4

12V/3A

5 6 7 8

VSEC_SW

D19

PTVS58VS1UR

2 1

1

3 2

Q7

FMMT723A

100V

1210

X7R

100V

6.3x7.7

R6

3.3K

R5

8.2

0805

D18

21

Q2

TPN1600ANH

470pFC81206

100pFC91206

D15

100uH

L4

DO1608C-104

C13

C10

-VOUT

E3

OPT

4

VPRI_SW

312

Q3

BAV19WS

2 1

10uF

10V

1206

0603

100V

10nF

+VOUT

R8

R9

OPT

VCC

www.linear.com

T2P

___

R1600805

1uF

C16

0805

25V

R30

OPT

0805

1

Q6

MMBT3904

Q5

MMBT3906

1 2 3

27

1206

27

1206

Q4

BSZ900N20NS3

8

3

7

2

6

1

5

4

0

R12

R11

7.50K

R10

6.65K

D16

PTVS58VS1UR

2 1

100V

C12

0.047uF

R21

174K

OPT

C15

C19

2 3

23

SG

PG

OPT

R13

18

20

24

23

21

12

25

26

28

U1

LT4295IUFD

1

R2700402

L3

100

17

SG

ISEN+

PG

VIN

VCC

VPORT

FB31

14

1 2

15

R15

C20

2.2nF

1uF

C17

R14

25m

1206

OPT

C27

0402

16

ISEN-

SWVCC

FFSDLY

HSSRC

exposed pad, solder side

HSGATE

AUX2RCLASS++3RCLASS

4

34

1mH

744272102

12

VSEC_SG

6

1

VPRI_SG

T3

OPT

C18

OPT

C21

R18

D13

PE-68386NL

13

ITHB

RLDCMP

ROSC

SFST

VCC VCC VCC VCC

T2P

GND GND_EP GND DNC NC

10K

BAT46WJ,115

4

3

9 8 7 6

5

1

+VOUT

4.7nF

C23

2KV

220pF

C25

C22

3.3nF

R24

26.1K

R23

OPT

R22

107K

15

10

0.1uF

C24

11

VCC

29 19 22 27

R20

1.00K

0805

R19

37.4

R17

2.00K

100pF

C26

25V

0402

R29

52.3K

R25

U2

10K

MOC207

1 7

R26

6

E11

5

2

5.1K

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

TECHNOLOGY

SCHEMATIC

TITLE:

K. HTOO

APPROVALS

PCB DES.

APP ENG.

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

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

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

PG

1

T4

2

VPRI_SG VSEC_SG

VSEC_P

7138

*

T2

OPTIONAL COMPONENTS

2

VAUX_P

SHEET OF

1

LT4295IUFD, LT4321IUF

DEMO CIRCUIT 2475A-A

LT4295IUFD, LT4321IUF

DEMO CIRCUIT 2475A-A

LT4295IUFD, LT4321IUF

DEMO CIRCUIT 2475A-A

Thursday, June 02, 2016

IC NO. REV.

HIGH EFFICIENCY IEEE802.3bt PD WITH PoE IDEAL DIODE BRIDGE

N/A

SIZE

DATE:

SIZE

DATE:

SIZE

DATE:

2

SCALE = NONE

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

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

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

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

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

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

3

D17

PMEG1020EA

2 1

4

OPT

3

4

VSEC_SW

6

5

4

VPRI_P

VPRI_SW

5

E1

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PRODUCTION1 2 3-3-2016

AUX+

37V-57V

D D

10

VPORTP

E4

VPORTP

C C

37V-57V

E9

VPORTN

R32

OPT

E12

E10

GND

AUX-

B B

VAUX_P VSEC_P

A A

5

dc2475aafb

DEMO MANUAL

5

4

3

2

1

22

DC2475A-A

schematic Diagram

2

www.linear.com

KAUNG H.

www.linear.com

KAUNG H.

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

PRODUCTION1 2 3-3-2016

TECHNOLOGY

D2

PTVS58VS1UR

2 1

C11

0.047uF

100V

BG36

BG12

DATA1-1

OUT

TO

1234567

PHY

SS-6488S-A-NF

8

J2

910

TG12

U3

LT4321IUF

VPORTP

13

14

15

16

VPORTP

IN12

R28

0

D3

MMSZ5252BS

24V

2 1

12

EN11EN

OUTP

BG36

BG12

TG12

TG361IN362IN453TG45

DATA1-2

TG36

10

EP

DATA2-1

VPORTN

9

17

OUTN

4

TG45

BG45

8

BG78

7

IN78

6

TG78

5

TECHNOLOGY

SCHEMATIC

TITLE:

K. HTOO

APPROVALS

PCB DES.

APP ENG.

BG45

BG78

DATA2-2

TG78

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

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

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

VPORTN

SHEET OF

1

LT4295IUFD, LT4321IUF

DEMO CIRCUIT 2475A-A

LT4295IUFD, LT4321IUF

DEMO CIRCUIT 2475A-A

LT4295IUFD, LT4321IUF

DEMO CIRCUIT 2475A-A

Thursday, June 02, 2016

IC NO. REV.

HIGH EFFICIENCY IEEE802.3bt PD WITH PoE IDEAL DIODE BRIDGE

N/A

SIZE

DATE:

SIZE

DATE:

SIZE

DATE:

2

SCALE = NONE

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

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

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

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

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

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

3

RT4

75

RT3

75

CG1

1808

2KV

1000pF

RT2

75

RT1

75

10

5

2

9

TRD4+

7

16

7

VC214VC113VC315VC4

TRD4-

TRCT4

8

11

4

3

PoE+

PSE

TRD3+

4

8

1

TRD3-

TRCT3

5

12

6

TRD1-

TRD1+

TRCT1

1

TRD2-

TRD2+

TRCT2

2

3

6

IN FROM

D D

DATA1-1

4 X 75 Ohms

4 X 12nF

C C

18

DATA1-2

SHIELD17SHIELD

DATA2-1

1nF 2kV

DATA2-2

J1

CG2

0.01uF

7499511001A

100V

1206

PoE IDEAL DIODE BRIDGE

TG78

4

PSMN075-100MSE

5 6 7 8

Q17

TG45

4

PSMN075-100MSE

5 6 7 8

Q15

TG36

4

PSMN075-100MSE

5 6 7 8

Q13

TG12

4

PSMN075-100MSE

5 6 7 8

Q11

B B

BG78

4

PSMN075-100MSE

5 6

1 2 3

DATA2-1

1 2 3

DATA1-2

1 2 3

DATA1-1 DATA2-2

1

7

2

8

3

Q18

BG45

4

PSMN075-100MSE

5 6

1

7

2

8

3

Q16

BG36

4

PSMN075-100MSE

5 6

1

7

2

8

3

Q14

BG12

4

PSMN075-100MSE

5 6

1

7

2

8

3

Q12

A A

4

5

dc2475aafb

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.

11

DEMO MANUAL DC2475A-A

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

12

dc2475aafb

LT 0517 REV B • PRINTED IN USA