DC2047A-A High Efficiency PoE PD Interface with Integrated ...

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DEMO MANUALDC2047A-A

Description

LT4276, LT4321, LT4320 High Efficiency PoE PD Interface with Integrated

Switching Regulator and 9-57VDC/24VAC AUX Support

Demonstration circuit 2047A-A is an IEEE802.3at compli-ant Power over Ethernet (PoE) Powered Device (PD) with support for 9-57VDC and 24VAC auxiliary supply input. It features the LT®4276 PD interface and switching regulator controller, the LT4321 PoE ideal diode bridge controller, and the LT4320 ideal diode bridge controller.

The LT4276 provides IEEE802.3af (PoE, Type 1) and IEEE802.3at (PoE+, Type 2) compliant interfacing and power supply control. It utilizes an external, low RDS(ON) (57mΩ typical) N-channel FET for the hot swap function to improve efficiency. The LT4276 also provides a DC-DC converter configured as a highly efficient flyback topology with synchronous rectification.

The LT4321 controls eight low RDS(ON) (57mΩ typical) N-channel FETs to further improve end-to-end power delivery efficiency and ease thermal design. This solution replaces the eight diodes typically found in a passive PoE rectifier bridge.

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

performance summary

The LT4320 controls four N-channel FETs (9.6mΩ typical) to replace a diode bridge typically found at the auxiliary supply input. AC rectification and DC polarity correction are provided. This solution reduces voltage drop associ-ated with the diode bridge and enables the power supply operation as low as 9VDC at the auxiliary supply input. This improves end-to-end efficiency and reduces heat.

The DC2047A-A accepts up to 25.5W of delivered power from a Power Sourcing Equipment (PSE) via the RJ45 connector (J1) or a local AC/DC power supply using the auxiliary supply input. When both supplies are connected, the auxiliary supply input has priority over the PoE input. The DC2047A-A supplies a 12V output at up to 1.9A.

Design files for this circuit board are available at http://www.linear.com/demo/DC2047A-A

Specifications are at TA = 25°C

PARAMETER CONDITIONS VALUE

Port Voltage (VPORT) At RJ45 37V to 57V

Auxiliary Voltage (VAUX) From AUX+ to AUX– Terminals 9V to 57VDC/24VAC

Output Voltage (VOUT) 12V (Typical)

Output Current (IOUT) 1.9A (Max)

Output Voltage Ripple VPORT = 42.5V, IOUT = 1.9A 90mVP-P (Typical)

Load Regulation ±0.6% (Typical)

Efficiency VPORT = 42.5V, IOUT = 1.9A, End-to-End 88% (Typical)

Switching Frequency 250kHz (Typical)

http://www.linear.com/LT4276

http://www.linear.com/demo/DC2047A-A

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BoarD photo

Top Side

Bottom Side

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Top Side Bottom Side

Figure 1. Thermal Pictures (Conditions: VAUX = 57V, VOUT = 12V, IOUT = 1.9A)

9VAUX24VAUX42VAUX/VPORT57VAUX/VPORT

LOAD CURRENT (A)0 0.5 1 1.5 2

50

59

68

77

86

95

EFFI

CIEN

CY (%

)

9VAUX24VAUX42VAUX/VPORT57VAUX/VPORT

LOAD CURRENT (A)0 0.5 1 1.5 2

11.50

11.75

12.00

12.25

12.50

V (OU

T) (V

)

Figure 2. Efficiency (End-to-End) Figure 3. Load Regulation

typical performance characteristics

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Figure 4. Output Voltage Ripple (Conditions: VAUX = 9V, VOUT = 12V, IOUT = 1.9A)

Figure 5. Load Transient Response (Conditions: VAUX = 9V, Load Step: 0.95A to 1.9A to 0.95A)

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Figure 6. Gain and Phase Margin of the Flyback DC/DC Converter (Conditions: VAUX = 9V, VOUT = 12V, IOUT = 1.9A)

CROSSOVER FREQUENCY GAIN MARGIN PHASE MARGIN

3.5kHz 12dB 58°


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Quick start proceDurePower over Ethernet (PoE) Input

1. Disconnect auxiliary supply if it is connected to AUX+ and AUX– inputs of the DC2047A-A.

2. Place and connect test equipment (voltmeter, am-meter, oscilloscope, and electronic load) as shown in Figure 7.

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

4. Connect the DC power supply to the DC1567A. Turn on the DC power supply and set its current limit to 1A. Then increase its output voltage to 57V.

5. Connect the output of the DC1567A to the RJ45 con-nector (J1) of the DC2047A using a CAT5e or CAT6 Ethernet cable.

6. After the LED (D4) on the DC2047A is lit, check the output voltage using a voltmeter. Output voltage should be within 12.0V ±0.2V.

7. Turn on the electronic load and increase its load cur-rent up to 1.9A. Observe the output voltage regulation, efficiency, and other parameters.

8. Verify T2P response with a voltmeter as shown in Figure 7. The T2P response to the type of PSE connected to the DC2047A-A is provided in Table 1.

DC1567AIEEE 802.3at

(Type 2, PoE+)PSE

DC POWERSUPPLY

CAT5eor CAT6CABLE

+

–

+

–

VOLTMETER

ELECTRONICLOAD

AMMETER

+

–

+

–

+

–

VOLTMETER+

–

Figure 7. Setup Diagram for PoE Input

Table 1. T2P Response vs PSE TypePSE T2P RESPONSE NEGOTIATED PD INPUT POWER

IEEELogic High 13W

Logic Low 25.5W

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Quick start proceDureAuxiliary Supply Input

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

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 DC2047A as shown in Figure 8. Turn on the auxiliary supply and set its current limit to 1A. Then increase its output voltage to 48V.

4. Once the LED (D4) on the DC2047A 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 1.9A. Observe the output voltage regulation, efficiency, and other parameters.

6. Verify T2P response with a voltmeter as shown in Figure 8. The T2P response during auxiliary power operation is: Logic Low.

VOLTMETER

ELECTRONICLOAD

AMMETER

+

–

+

–

+

–

VOLTMETER+

–

AUXILIARYSUPPLY

+ –

Figure 8. Setup Diagram for Auxiliary Supply Input

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parts listITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC2047A 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, ELEC, OPT 5.0×5.9 OPT

5 1 C6 CAP, ELEC, 10µF 100V 10% 6.3×7.7 SUNCON 100CE10BS

6 2 C7, C29 CAP, CER, X7S 4.7µF 100V 10% 1210 TDK C3225X7S2A475K200AB

7 1 C10 CAP, CER, X7R 100nF 100V 10% 0805 TDK C2012X7R2A104K125AE

8 2 C11, C12 CAP, CER, X7R 0.047µF 100V 10% 0603 KEMET C0603C473K1RACTU

9 1 C13 CAP, CER, X7R 22µF 10V 20% 1206 MURATA GRM31CR71A226ME15

10 1 C14 CAP, CER, X7R 1µF 100V 10% 0805 MURATA GRJ21BC72A105KE1L

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 10% 0402 AVX 0402YC101KAT2A

16 1 C27 CAP, CER, X7R 4.7nF 6.3V 10% 0402 MURATA GRM155R70J472KA01D

17 1 C28 CAP, ELEC, 680µF 63V 20% 12.5×25 PANASONIC EEU-FR1J681L

18 1 C31 CAP, CER, X7R 0.1µF 100V 10% 0805 MURATA GRM188R72A104KA35

19 4 D2, D16, D19, D23 DIODE, TVS, PTVS58VS1UR 58V SOD123 NXP PTVS58VS1UR

20 1 D3 DIODE, ZENER, MMSZ5252BS 24V SOD323 DIODES INC MMSZ5256BS-7-F

21 1 D4 DIODE, LED ROHM SML-010FTT86L

22 1 D13 DIODE, SCHOTTKY, BAT46WJ,115 100V SOD323 NXP BAT46WJ,115

23 1 D15 DIODE, SCHOTTKY, PMEG10010ELRX 100V SOD123 NXP PMEG10010ELRX

24 1 D17 DIODE, SCHOTTKY, BAT54WS 30V SOD323 DIODE INC BAT54WS-7-F

25 3 D20, D21, D22 DIODE, SILICON, MMSD4148 100V SOD123 FAIRCHILD SEMI MMSD4148

26 8 E2, E3, E4, E5, E7, E9, E11, E12

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

27 1 J1 CONN, INTEGRATED JACK, 7499511611A WURTH 7499511611A

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

29 1 L2 IND, 8.2µH WURTH 7443330820

30 1 L3 IND, CMC, 3.3mH WURTH 744272332

31 1 L3 (ALTERNATE) IND, CMC, 3.3mH PCA ELECTRONICS EPA4411-LF

32 1 L4 IND, 22µH BOURNS PM43-220M-RC

33 1 L5 IND, 2.2µH 0805 MURATA LQM21PN2R2NGCD

34 9 Q1, Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q18

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

35 1 Q4 MOSFET, N-CH, BSC109N10NS3 G 100V SUPERSO8 INFINEON BSC109N10NS3 G

36 1 Q5 TRANSISTOR, PNP, PBSS5140T 40V SOT23 NXP PBSS5140T

37 1 Q6 TRANSISTOR, NPN, PBSS4140T 40V SOT23 NXP PBSS4140T

38 1 Q7 TRANSISTOR, PNP, FMMT723 100V SOT23 DIODES INC FMMT723TA

39 4 Q8, Q9, Q10, Q19 MOSFET, N-CH, PSMN011-60MS 60V LFPAK33 NXP PSMN011-60MS

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40 4 RT1, RT2, RT3, RT4 RES, CHIP, 75Ω 5% 0603 NIC NRC06J750TRF

41 1 R5 RES, CHIP, 8.2Ω 5% 0805 NIC NRC10J8R2TRF

42 1 R6 RES, CHIP, 3.3k 5% 0603 NIC NRC06J332TRF

43 1 R7 RES, CHIP, 1Ω 5% 0805 NIC NRC101R0TRF

44 3 R12, R28, R34 RES, CHIP, 0Ω SHUNT 0603 NIC NRC06ZOTRF

45 1 R13 RES, CHIP, 100Ω 5% 0603 VISHAY CRCW0603100RJNEA

46 1 R14 RES, CHIP, 15mΩ 1% 2010 VISHAY WSL2010R0150FEA

47 1 R15 RES, CHIP, 15Ω 5% 0603 NIC NRC06J150TRF

48 1 R33 RES, CHIP, 0Ω SHUNT 0805 NIC NRC06ZOTRF

49 1 R17 RES, CHIP, 2.00k 1% 0603 NIC NRC06F2001TRF

50 2 R18, R26 RES, CHIP, 10k 5% 0603 NIC NRC06J103TRF

51 1 R21 RES, CHIP, 158k 1% 0603 NIC NRC06F1583TRF


53 2 R27, R31 RES, CHIP, 10Ω 5% 0402 NIC NRC04J100TRF


55 0 R32 RES, CHIP, OPT 1% 1812 OPT

56 1 ISO1 OPTO, TRANSISTOR OUTPUT OPTOCOUPLER, SO4 TOSHIBA TLP291(GR-TP,SE)

57 1 T3 XFMR, SMD GATE DRIVE, EPA4271GE PCA EPA4271GE

58 0 T3 (ALTERNATE) XFMR, SMD GATE DRIVE, PE-68386NL PULSE PE-68386NL

59 0 T4 XFMR, SMD GATE DRIVE, OPT OPT

60 1 U1 IC, PD AND SWITCHER CONTROLLER, LT4276BIUFD QFN28

LINEAR TECH LT4276BIUFD

61 1 U3 IC, PoE IDEAL DIODE BRIDGE CONTROLLER, LT4321IUF QFN16

LINEAR TECH LT4321IUF

62 1 U4 IC, IDEAL DIODE BRIDGE CONTROLLER, LT4320IDD DFN8

LINEAR TECH LT4320IDD

63 4 MH1-MH4 STAND-OFF, NYLON 0.50" TALL (SNAP ON) KEYSTONE 8833

64 1 STENCIL STENCIL DC2047A

DC2047A-A

1 2 C2,C3 CAP, CER, X5R 10µF 16V 10% 1206 MURATA GRM31CR61C106KA88

2 1 C4 CAP, ELEC, 22µF 16V 20% 5.0×5.9 PANASONIC 16SVP22M

3 1 C8 CAP, CER, U2J 220pF 630V 5% 1206 MURATA GRM31A7U2J221JW31D

4 1 C9 CAP, CER, U2J 220pF 630V 5% 1206 MURATA GRM31A7U2J221JW31D

5 1 C16 CAP, CER, X7R 1µF 25V 10% 0805 MURATA GRM21BR71E105KA99L

6 1 C22 CAP, CER, X7R 3.3nF 25V 10% 0603 AVX 06033C332KAT2A

7 1 C24 CAP, CER, X7R 0.1µF 25V 10% 0603 MURATA GRM188R71E104KA01D

8 1 C25 CAP, CER, X7R 100pF 25V 10% 0603 AVX 06033C101KAT2A

9 0 D18 DIODE, SCHOTTKY, OPT SOD323 OPT

10 1 L1 IND, 180nH COILCRAFT DO1813P-181HC

11 1 Q2 MOSFET, N-CH, TPH5200FNH 250V SOP ADVANCE TOSHIBA TPH5200FNH

12 1 R2 RES, CHIP, 1.5k 5% 0805 NIC NRC06J152TRF

13 1 R3 RES, CHIP, 62Ω 5% 1206 PANASONIC ERJ-8GEYJ620V

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14 1 R4 RES, CHIP, 62Ω 5% 1206 PANASONIC ERJ-8GEYJ620V



17 1 R10 RES, CHIP, 4.75k 1% 0603 NIC NRC06F4751TRF

18 1 R11 RES, CHIP, 5.23k 1% 0603 VISHAY, CRCW06035K23FKEA

19 1 R16 RES, CHIP, 0Ω SHUNT 0805 VISHAY CRCW08050000Z0EA


21 1 R20 RES, CHIP, 35.7Ω 1% 0805 VISHAY CRCW080535R7FKEA

22 1 R23 RES, CHIP, 20k 5% 0603 VISHAY CRCW060320K0JNEA

23 1 R24 RES, CHIP, 30k 5% 0603 VISHAY CRCW060330K0JNEA

24 1 R25 RES, CHIP, 47k 5% 0603 NIC NRC06J473TRF



27 1 T1 XFMR, PWR TRAN, 750315422 WURTH 750315422

28 0 T1 (ALTERNATE) XFMR, PWR TRAN, EPC3601 PCA ELECTRONICS EPC3601G-LF

29 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2047A

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schematic Diagram5 5

4 4

3 3

2 2

1 1

DD

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VPO

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6 1

23

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35.7

0805

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21

R23

20K

22uH

L4PM

43-2

20M

-RC

Q7

FMM

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32

1

E3

R35

OPT

2512

R10

4.75

KO

PTC

19

T1 7503

1542

2

1

1186 4

7 12

5 2 3

PBSS

5140

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5 1

23

D22

MM

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6

4

5

87

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R22

107K

R16

0 0805

R17

2.00

K

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FC

9

1206

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3.3K

OPT

C21

R19

OPT 08

05

R9

130

1206

R3

62 1206

E9

C10

100n

F10

0V

4.7u

F10

0V12

10X7

S

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BSC

109N

10N

S3 G

100V

6

4

5

87

123

100p

F

C25

R15 15

R30

OPT

0805

R5

8.2

0805

R27 10

R31

10

D18

OPT

2 1

EPA4

271G

E

T31 3

6 4

C2

X5R

16V

1206

10uF

E4

D17

BAT5

4WS

21

E2

4.7u

F10

0V12

10X7

S

C7

R7

1

R14

15m

2010

E12

R4

62 1206

+10

uF10

0V6.

3x7.

7

C6

0.04

7uF

C12 100V

D15

PMEG

1001

0ELR

X

21E1

1

R25

47K

HSS

2.2u

HL5

Mur

ata

LQM

21PN

2R2N

GC

D

4.7n

FC

23

220p

FC

8

1206

2.2n

FC

201u

F

C17

0.1u

F

C31

100V

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MM

SD41

48

2

1

+C

422

uF16

V16

SVP2

2M

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158K

R12 0

R11

5.23

K

T4

T547

6

1 4

2 3

R26

10K

R24

30K

R29

931K

D4

LE

D

+C

5O

PT16

V5.

0X5.

9

OPT

C1

OPT

C15

expo

sed

pad,

sol

der s

ide

U1

LT42

76BI

UFD

VPORT28

HSGATE26

HSSRC25

SWVCC23

DNC22

VCC21

VIN24

PG20

FB31

14

ISE

N-

16

ISE

N+

17

SG18

AU

X2

RC

LAS

S++

3

RC

LAS

S4

GND19

VCC6

VCC7

VCC8

T2P5

SFST11

RLDCMP15

VCC9

GND1

ITH

B13

FFSDLY12

NC27

ROSC10

GND_EP29

4.7n

FC

27

6.3V

D19

PTVS

58VS

1UR

21

22uF

C13

10V

1206

R34

0

L3

3.3m

H74

4272

332

12 3

4

OPT

C18

C3

10uF

X5R

16V

1206

R32

OPT

R8

130

1206

ISO

1TL

P291

, GR

L

1 2

4 3

100p

FC

26

16V

0402

0.1u

FC

24

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R13

100

VPR

I_SG

SG

VPRI

_SW

PG

VSEC

_SWVS

EC_P

VPRI

_P

PG

VPR

I_SG

VSEC

_SG

VSEC

_SG

FBVS

EC_P

VAU

X_P

FB

12dc2047aafa


schematic Diagram5 5

4 4

3 3

2 2

1 1

DD

CC

BB

AA

OU

T T

OPH

Y

IN F

RO

MPo

E+PS

E

PoE

IDEA

L D

IOD

E B

RID

GE

AND

9V-5

7V A

UX S

UPPO

RT

VPO

RTN

VPO

RTP

REVI

SION

HIS

TORY

DESC

RIPT

ION

DATE

APPR

OVED

ECO

REV

KAUN

G H.

PROD

UCTI

ON1

36-

23-2

016

REVI

SION

HIS

TORY

DESC

RIPT

ION

DATE

APPR

OVED

ECO

REV

KAUN

G H.

PROD

UCTI

ON1

36-

23-2

016

REVI

SION

HIS

TORY

DESC

RIPT

ION

DATE

APPR

OVED

ECO

REV

KAUN

G H.

PROD

UCTI

ON1

36-

23-2

016

SIZE

DATE

:

IC N

O.RE

V.

SHEE

TOF

TITL

E:

APPR

OVAL

S

PCB

DES.

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HN

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GY

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)434

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r.com 3

Thur

sday

, Sep

tembe

r 08,

2016

23

HIGH

EFF

ICIE

NCY

POE

PD IN

TERF

ACE

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ATED

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SIZE

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www.

linea

r.com 3

Thur

sday

, Sep

tembe

r 08,

2016

23

HIGH

EFF

ICIE

NCY

POE

PD IN

TERF

ACE

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H IN

TEGR

ATED

SW

ITCH

ING

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LATO

R

K. H

TOO

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LT42

76BI

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T432

0IDD

DEMO

CIR

CUIT

2047

A-A

SIZE

DATE

:

IC N

O.RE

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SHEE

TOF

TITL

E:

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TEC

HN

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r.com 3

Thur

sday

, Sep

tembe

r 08,

2016

23

HIGH

EFF

ICIE

NCY

POE

PD IN

TERF

ACE

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TEGR

ATED

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R

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MM

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5-10

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5

87

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D2

PTVS

58VS

1UR

21

Q11

PSM

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5-10

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6

4

5

87

123

DAT

A2-1

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75

DAT

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Q18

PSM

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5-10

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6

4

5

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CG

20.

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6

4

5

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123

Q13

PSM

N07

5-10

0MSE

6

4

5

87

123

J2 SS-6

488S

-A-N

F

1 2 3 4 5 6 7 8

9 10

Q14

PSM

N07

5-10

0MSE

6

4

5

87

123

C11

0.04

7uF

100V

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5

87

123

RT1

75

1 2 3 6 4 5 7 8

4 X

12n

F

4 X

75

Ohm

s

1nF

2kV

YLOW

ORG

GRN

J1 7499

5116

11A

TRD

1+11

TRC

T112

TRD

1-10

TRD

2+4

TRC

T26

TRD

2-5

TRD

3+3

TRC

T31

TRD

3-2

TRD

4+8

TRC

T47

TRD

4-9

VC

214

VC

113

VC

315

VC

416

SH

IELD

21S

HIE

LD22

LED

Y-

17

LED

Y+

18

LED

O19

LED

G20

Q16

PSM

N07

5-10

0MSE

6

4

5

87

123

RT3

75

EP

U3

LT43

21IU

F

TG36

1

IN36

2

IN45

3

TG45

4

TG785

IN786

BG787

BG458

OU

TP12

EN

11

EN

10

OU

TN9

TG1216

IN1215

BG1214

BG3613

17O

UTN

DAT

A1-1

RT2

75

DA

TA2-

1

DA

TA2-

2

DAT

A1-1

DAT

A1-2

BG12

BG36

DAT

A1-2

TG36

TG45

DAT

A2-1

DAT

A1-1

DAT

A2-2

TG12

BG45

TG45

BG36

TG36

BG12

TG78

BG78

VPOR

TN

BG78

DATA2-2

TG78

DAT

A2-1

DATA1-1

DAT

A1-2

TG12

BG45

VPOR

TN

VPOR

TP

13dc2047aafa


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

5 5

4 4

3 3

2 2

1 1

DD

CC

BB

AA

VIN2

VIN1

AND

9V-5

7V A

UX S

UPPO

RT

9V-5

7VDC

24VA

C

AU

X+

AU

X-

AU

X_R

EC

TIFI

ED

+

AU

X_R

EC

TIFI

ED

-

SIZE

DATE

:

IC N

O.RE

V.

SHEE

TOF

TITL

E:

APPR

OVAL

S

PCB

DES.

APP

ENG.

TEC

HN

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GY

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(408

)434

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7

Milp

itas,

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e: (4

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Conf

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Use

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OMER

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AND

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MAT

IC

SUPP

LIED

FOR

USE

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H LI

NEAR

TEC

HNOL

OGY

PART

S.SC

ALE

= NO

NE

www.

linea

r.com 3

Thur

sday

, Sep

tembe

r 08,

2016

33

HIGH

EFF

ICIE

NCY

POE

PD IN

TERF

ACE

WIT

H IN

TEGR

ATED

SW

ITCH

ING

REGU

LATO

R

K. H

TOO

K. H

TOO

N/A

LT42

76BI

UFD,

LT4

321IU

F, L

T432

0IDD

DEMO

CIR

CUIT

2047

A-A

SIZE

DATE

:

IC N

O.RE

V.

SHEE

TOF

TITL

E:

APPR

OVAL

S

PCB

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APP

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TEC

HN

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GY

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itas,

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OGY

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www.

linea

r.com 3

Thur

sday

, Sep

tembe

r 08,

2016

33

HIGH

EFF

ICIE

NCY

POE

PD IN

TERF

ACE

WIT

H IN

TEGR

ATED

SW

ITCH

ING

REGU

LATO

R

K. H

TOO

K. H

TOO

N/A

LT42

76BI

UFD,

LT4

321IU

F, L

T432

0IDD

DEMO

CIR

CUIT

2047

A-A

SIZE

DATE

:

IC N

O.RE

V.

SHEE

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TITL

E:

APPR

OVAL

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© LINEAR TECHNOLOGY CORPORATION 2016

LT 0917 REV A • PRINTED IN USA

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

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