DC2046A-B LT4276, LT4321PoE PD with SynchronousFlyback and ... · 41 1 R15 Res, Chip, 15Ω 5% 0603...

1dc2046abf

DEMO MANUAL DC2046A-B

DESCRIPTION

LT4276, LT4321 PoE PD with Synchronous

Flyback and Ideal Diode Bridge

Demonstration circuit 2046A-B is a PoE Powered Device (PD) with an isolated power supply using synchronous flyback topology, featuring the LT®4276 and ideal diode bridge controller (LT4321).

The LT4276 provides IEEE802.3af (PoE, Type 1), IEEE802.3at (PoE+, Type 2), and LTPoE++™ PD in-terfacing and power supply control. When the PD is fully powered, the PD interface switches power over from the Power Sourcing Equipment (PSE) to the switcher through an external, low resistance, high power N-channel FET. The highly integrated LT4276 controls

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTPoE++ is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

BOARD PHOTOS

a high power, small-sized power supply that utilizes a highly efficient flyback topology with synchronous rectification. The LT4321 provides further efficiency improvement by minimizing the bridge losses.

The DC2046A-B supplies a 5V output at up to 4.7A. It also demonstrates the use of an optional auxiliary power supply input of 48V. When present, the auxiliary supply becomes the dominant supply over PoE to provide power.

Design files for this circuit board are available at http://www.linear.com/demo/DC2046A-B

Specifications are at TA = 25°C

Top Side Bottom Side

PARAMETER CONDITIONS VALUE

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

Auxiliary Voltage From AUX+ to AUX– Terminals 37V to 57V

Output Voltage 5V (Typ)

Output Current 4.7A (Max)

Output Voltage Ripple VPORT = 42.5V, IOUT = 4.7A 30mVP-P (Typ)

Output Regulation ±0.2% (Typ)

Efficiency VPORT = 50V, IOUT = 4.7A, End to End 92% (Typ)

Switching Frequency 250kHz (Typ)

http://www.linear.com/LT4276

http://www.linear.com/LT4321

http://www.linear.com/demo/DC2046A-B

2dc2046abf


TYPICAL PERFORMANCE CHARACTERISTICS

Figure 2. Efficiency (End to End)

Top Side Bottom Side

Figure 1. Thermal Pictures – VPORT = 42.5V, 5V/4.7A

Figure 3. Output Voltage Regulation

LOAD CURRENT (A)0.5

78

EFFI

CIEN

CY (%

)

80

82

84

3.5 4.0 4.5

94

92

DC2046A-B F02

1.0 1.5 2.0 2.5 3.0 5.0

86

88

90

VPORT = 42.5VVPORT = 50VVPORT = 57V

LOAD CURRENT (A)0.5

4.80

V OUT

(V)

4.90

4.95

5.00

3.5 4.0 4.5

5.20

DC2046A-B F03

4.85

1.0 1.5 2.0 2.5 3.0 5.0

5.05

5.10

5.15

VPORT = 42.5VVPORT = 50VVPORT = 57V

3dc2046abf


Figure 5. Output Voltage Ripple (VPORT = 42.5V, 5V/4.7A)


Figure 4. Stresses (VPORT = 57V, 5V/4.7A)

4dc2046abf


Figure 6. Load Transient Response (VPORT = 42.5V, 2.35A to 4.7A to 2.35A)

Figure 7. Gain and Phase Margin of the Flyback Loop (VPORT = 42.5V, 5V/0.47A)


5dc2046abf


QUICK START PROCEDURE

Figure 8. Proper Measurement Equipment Setup

Demonstration circuit 2046A-B is easy to set up to evalu-ate the performance of the LT4276 in a PoE+ application. Refer to Figure 8 for proper equipment setup and follow the procedure below.

NOTE: When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip and probe ground directly across the +VOUT and –VOUT terminals. See Figure 9 for proper scope probe technique.

1. Place test equipment (voltmeter, ammeter, power sup-plies, and electronic load) as shown in Figure 8.

2. Input supplies:

A) Connect a PoE+ capable PSE with a CAT-5 cable to the RJ45 connector, J1. See Figure 8.

B) Or, connect a 37V to 57V capable power supply (Power Supply in Figure 8) across VPORTP and VPORTN.

C) If evaluating the auxiliary power supply (Auxiliary Supply in Figure 8), connect a 37V to 57V capable power supply across AUX+ to AUX–.

3. Check for the proper output voltage of 5V.

4. Once the proper output voltage is confirmed, adjust the load within the operating range and observe the output voltage regulation, ripple voltage, efficiency, and other parameters.

6dc2046abf


Figure 9. Measuring Output Ripple

QUICK START PROCEDURE

GND

VIN

7dc2046abf


PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC2046A 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 12061C103AT2A

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% 6.3 × 7.7 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 10uF 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 10% 1812 Murata GR443DR73D472KW01L

15 1 C26 Cap, Cer, X5R 100pF 16V 10% 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, Diodes Inc., BAV19WS 120V SOD323 Diodes Inc. BAV19WS


24 1 D17 Diode, Schottky, BAT54WS 30V SOD323 Diodes Inc BAT54WS


26 7 E1, E2, E3, E4, E9, E10, E12 TP, Turret, PAD150-094 0.094 Mill-Max 2501-2-00-80-00-00-07-0

27 1 J1 Conn, Integrated Jack, 7499511001 Würth 7499511001

28 1 J2 Conn, RJ45 Jack, SS-6488-NF-K1 Stewart Connector SS-6488-NF-K1 Alternate: SS-6488S-A-NF

29 1 L2 Ind, 10µH Coilcraft DO1608C-103

30 1 L4 Ind, 100µH Coilcraft DO1608C-104

31 9 Q1, Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q18

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

32 1 Q5 Tran, PNP, MMBT3906 40V SOT23 Fairchild MMBT3906

33 1 Q6 Tran, NPN, MMBT3904 40V SOT23 Fairchild MMBT3904

34 1 Q7 Tran, PNP, FMMT723 100V SOT23 Diodes Inc. FMMT723TA

34 0 Q7 (ALTERNATE) Tran, PNP, PBSS9110T 100V SOT23 NXP PBSS9110T

35 4 RT1, RT2, RT3, RT4 Res, Chip, 75Ω 5% 0603 NIC NRC06J750TRF

36 1 R5 Res, Chip, 8.2Ω 5% 0805 NIC NRC10J8R2TRF

37 1 R6 Res, Chip, 3.3k 5% 0603 NIC NRC06J332TRF

8dc2046abf



38 1 R7 Res, Chip, 20Ω 5% 0805 Vishay CRCW080520R0JNEA

39 1 R12 Res, Chip, 0Ω 5% 0603 NIC NRC06ZOTRF

40 1 R13 Res, Chip, 100Ω 5% 0603 Vishay CRCW0603100RFKEA

41 1 R15 Res, Chip, 15Ω 5% 0603 NIC NRC06J150TRF

42 1 R17 Res, Chip, 2.00k 1% 0603 NIC NRC06F2001TRF

43 1 R18 Res, Chip, 10k 5% 0603 Yageo RC0603JR-0710KL

44 1 R21 Res, Chip, 174k 1% 0603 Vishay CRCW0603174KFKEA

45 1 R22 Res, Chip, 107k 1% 0603 NIC NRC06F1073TRF



48 1 R29 Res, Chip, 52.3k 1% 0603 Vishay CRCW060352K3FKEA

49 0 R32 Res, Chip, Opt 5% 1812 Opt

50 1 T3 XFMR, SMD Gate Drive, PE-68386NL Pulse PE-68386NL

50 0 T3 (Alternate) XFMR, SMD Gate Drive, EPA4271GE PCA EPA4271GE

51 0 T4 XFMR, SMD Gate Drive, OPT Opt

52 1 U3 IC, PoE Ideal Bridge Controller, LT4321IUF QFN16 Linear Technology LT4321IUF

DC2046A-B BOM

1 1 C2 Cap, Cer, X7R 22µF 6.3V 10% 1206 Murata GRM31CR70J226KE19

2 1 C3 Cap, Cer, X7R 22µF 6.3V 10% 1206 Murata GRM31CR70J226KE19

3 1 C4 Cap, Elec, 47µF 6.3V 20% 5.0 × 5.3 Panasonic 6SVP47M

4 1 C8 Cap, Cer, U2J 1nF 630V 5% 1206 Murata GRM31A7U2J102JW31D

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 Murata GRM188R71E332KA01

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, Diodes Inc., Opt 40V SOD323 Diodes 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, 3.3mH Würth 744272332

13 0 L3 (Alternate) Ind, CMC, 3.3mH PCA EPA4411

14 1 Q2 MOSFET, N-CH, PSMN2R4-30MLD 30V LFPAK33 NXP PSMN2R4-30MLD

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

16 1 Q4 MOSFET, N-CH, 150V TDSON-8 Infineon BSZ520N15NS3G

17 1 R2 Res, Chip, 620Ω 5% 0805 NIC NRC10J621TRF

18 1 R3 Res, Chip, 160Ω 5% 1206 Vishay CRCW1206160RJNEA

19 1 R4 Res, Chip, 160Ω 5% 1206 Vishay CRCW1206160RJNEA

20 1 R8 Res, Chip, 5.1Ω 5% 1206 NIC NRC12J5R1TRF




9dc2046abf



24 1 R14 Res, Chip, 40mΩ 1% 1206 Vishay WSL1206R0400FEA

25 1 R16 Res, Chip, 0Ω, Shunt, 0805 Vishay CRCW08050000Z0EA


27 1 R20 Res, Chip, 35.7Ω 1% 0805 Vishay CRCW080535R7FKEA


29 1 R24 Res, Chip, 20k 5% 0603 Vishay CRCW060320K0FKEA

30 1 R25 Res, Chip, 47k 5% 0603 NIC NRC06J473TRF

31 1 R26 Res, Chip, 10k 5% 0603 Yageo RC0603JR-0710KL


33 0 R31 Res, Chip, Opt, Shunt, 2512 Opt

34 1 T1 XFMR, Flyback Tran, 750313082 Würth 750313082

34 0 T1 (Alternate) XFMR, Flyback Tran, EPC3409G PCA EPC3409G

35 0 T2 XFMR, Flyback Tran, Opt Opt

36 1 U1 IC, PD & Switcher Controller, LT4276BIUFD QFN28 Linear Technology LT4276BIUFD

37 1 U2 Opto, MOC207 SO8 Fairchild MOC207M

38 1 Fab, Printed Circuit Board Demo Circuit 2046A

10dc2046abf


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VCC9

GND1

ITH

B13

FFSDLY12

NC27

ROSC10

GND_EP29

R11

7.50

KR

117.

50K

PE-6

8386

NL

T3

PE-6

8386

NL

T31 3

6 4

E3E3

D16

PTVS

58VS

1UR

D16

PTVS

58VS

1UR

21

100p

FC

26

25V

0402

100p

FC

26

25V

0402

100u

H

L4D

O16

08C

-104

100u

H

L4D

O16

08C

-104

U2

MO

C20

7U

2M

OC

207

17

2

6 5

D13

BAT4

6WJ,

115

D13

BAT4

6WJ,

115

1 2

R29

52.3

KR

2952

.3K

220p

F

C25

220p

F

C25

10uH

L2

Coi

lcra

ftD

O16

08C

-103

10uH

L2

Coi

lcra

ftD

O16

08C

-103

L3

3.3m

H74

4272

332

L3

3.3m

H74

4272

332

12 3

4

OPT

C1

OPT

C1

R12 0

R12 0

+10

uF10

0V6.

3x7.

7

C6

+10

uF10

0V6.

3x7.

7

C6

R14

40m

1206

R14

40m

1206

E2E2

E10

E10

R5

8.2

0805

R5

8.2

0805

C10

10nF 0603

100V

C10

10nF 0603

100V

R17

2.00

KR

172.

00K

R22

107K

R22

107K

MM

BT39

06Q

5M

MBT

3906

Q5 1

23

OPT

C15

OPT

C15

E1E1

R7

20 0805

R7

20 0805

180n

HL1

CO

ILC

RAF

TD

O18

13P-

181H

C

180n

HL1

CO

ILC

RAF

TD

O18

13P-

181H

C

R3

160

1206

R3

160

1206

Q2

PSM

N2R

4-30

MLD

Q2

PSM

N2R

4-30

MLD

6

4

5

87

123

4.7n

FC

23

2KV

4.7n

FC

23

2KV

R15 15R15 15

OPT

C21

OPT

C21

Q3

OPT

Q3

OPT

3

1

2

Q1

PSM

N07

5-10

0MSE

Q1

PSM

N07

5-10

0MSE

6

4

58 7123

0.1u

FC

240.

1uF

C24

R25

47K

R25

47K

R4

160

1206R4

160

1206

D18

OPT

D18

OPT

2 1

R30

OPT

0805

R30

OPT

0805

R24

20K

R24

20K

E11

E11

Q7

FMM

T723Q7

FMM

T723

32

1

R20

35.7

0805R20

35.7

0805

R18

10K

R18

10K

+C

447

uF6.

3V6S

VP47

M

+C

447

uF6.

3V6S

VP47

M

D15

BAV1

9WS

D15

BAV1

9WS

21

OPT

C19

OPT

C19

C3

22uF

6.3V

1206

X7R

C3

22uF

6.3V

1206

X7R

R27 0

0402

R27 0

0402

T2 *T2 *

4

671 3

8 5

2

R9

OPT

1206R

9O

PT12

06

3.3n

F

C22

3.3n

F

C22

R26

10K

R26

10K

2.2n

FC

202.

2nF

C20C

2

X7R

6.3V

1206

22uF

C2

X7R

6.3V

1206

22uF

D4

LE

DD

4L

ED

R21

174K

R21

174K

Q4

BSZ5

20N

15N

S3G

Q4

BSZ5

20N

15N

S3G

6

4

5

87

123

100p

FC

9

1206

100p

FC

9

1206

MM

BT39

04Q

6M

MBT

3904

Q6 1

23

OPT

C18

OPT

C18

10uF

C13

16V

120610uF

C13

16V

1206

D17

BAT5

4WS

D17

BAT5

4WS

21

R6

3.3K

R6

3.3K

R10

5.90

KR

105.

90K

R23

OPT

R23

OPT

SCHEMATIC DIAGRAM

11dc2046abf


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 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

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

VPO

RTN

VPO

RTP

REVI

SION

HIS

TORY

DESC

RIPT

ION

DATE

APPR

OVED

ECO

REV

KAUN

G H.

PROD

UCTI

ON1

41-

7-20

15

REVI

SION

HIS

TORY

DESC

RIPT

ION

DATE

APPR

OVED

ECO

REV

KAUN

G H.

PROD

UCTI

ON1

41-

7-20

15

REVI

SION

HIS

TORY

DESC

RIPT

ION

DATE

APPR

OVED

ECO

REV

KAUN

G H.

PROD

UCTI

ON1

41-

7-20

15

SIZE

DATE

:

IC N

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www.

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Tues

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HIGH

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POE

PD IN

TERF

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BSI

ZE

DATE

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www.

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Tues

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NCY

POE

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TERF

ACE

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R

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BSI

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DATE

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www.

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r.com 4

Tues

day,

March

31, 2

015

22

HIGH

EFF

ICIE

NCY

POE

PD IN

TERF

ACE

WIT

H IN

TEGR

ATED

SW

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ING

REGU

LATO

R

K. H

TOO

K. H

TOO

N/A

LT42

76BI

UFD,

LT4

321I

UFDE

MO C

IRCU

IT 20

46A-

B

DAT

A1-2

DAT

A1-2

D3

MM

SZ52

52BS

24V

D3

MM

SZ52

52BS

24V

21

CG

110

00pF

1808

2KV

CG

110

00pF

1808

2KV

Q17

PSM

N07

5-10

0MSE

Q17

PSM

N07

5-10

0MSE

6

4

5

87

123

D2

PTVS

58VS

1UR

D2

PTVS

58VS

1UR

21

Q11

PSM

N07

5-10

0MSE

Q11

PSM

N07

5-10

0MSE

6

4

5

87

123

DAT

A2-1

DAT

A2-1

RT4

75RT4

75

DAT

A2-2

DAT

A2-2

R28 0R28 0

Q18

PSM

N07

5-10

0MSE

Q18

PSM

N07

5-10

0MSE

6

4

5

87

123

CG

20.

01uF

100V

1206

CG

20.

01uF

100V

1206

Q12

PSM

N07

5-10

0MSE

Q12

PSM

N07

5-10

0MSE

6

4

5

87

123

Q13

PSM

N07

5-10

0MSE

Q13

PSM

N07

5-10

0MSE

6

4

5

87

123

1 2 3 6 4 5 7 8

4 X

12n

F

4 X

75

Ohm

s

1nF

2kV

J1 7499

5110

01

1 2 3 6 4 5 7 8

4 X

12n

F

4 X

75

Ohm

s

1nF

2kV

J1 7499

5110

01

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

17S

HIE

LD18

J2 SS-6

488S

-A-N

F

J2 SS-6

488S

-A-N

F

1 2 3 4 5 6 7 8

9 10

Q14

PSM

N07

5-10

0MSE

Q14

PSM

N07

5-10

0MSE

6

4

5

87

123

C11

0.04

7uF

100V

C11

0.04

7uF

100V

Q15

PSM

N07

5-10

0MSE

Q15

PSM

N07

5-10

0MSE

6

4

5

87

123

RT1

75RT1

75

Q16

PSM

N07

5-10

0MSE

Q16

PSM

N07

5-10

0MSE

6

4

5

87

123

RT3

75RT3

75

EP

U3

LT43

21IU

F

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

DAT

A1-1

RT2

75RT2

75

12dc2046abf


Linear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2015

LT 0515 • 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

DC2046A-B LT4276, LT4321PoE PD with SynchronousFlyback and ... · 41 1 R15 Res, Chip, 15Ω 5% 0603...

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Transcript of DC2046A-B LT4276, LT4321PoE PD with SynchronousFlyback and ... · 41 1 R15 Res, Chip, 15Ω 5% 0603...