Linear Technology DC1733A Quick setup guide

dc1733af

DEMO MANUAL DC1733A

DESCRIPTION

LT3669

Industrial Transceiver with Integrated

Step-Down Regulator and LDO

Demonstration circuit 1733A is an industrial transceiver

with integrated step-down regulator and LDO featuring the

3669.Theboardoperatesfrom7.5Vto40VwhenJP7is

set to L+. When the JP7 is set to RES, the minimum input

voltage is 16.5V. The board withstands transients up to

60V.Thestep-downregulatoroutput

is5V.TheLDOoutput

is 3.3V. There are two assembly versions. DC1733A-A is

for the LT3669 and DC1733A-B is for the LT3669-2. The

difference is the LT3669 has an integrated catch diode.

The LT3669-2 requires an external catch diode. Table 1

shows the differences between the two versions. L, LTC, LTM, LT, Burst Mode are registered trademarks of Linear Technology Corporation.

Other product names may be trademarks of the companies that manufacture the products..

PERFORMANCE SUMMARY

The board also provides various interfaces for line drivers

and receivers. JP8 to JP11 set the signal sources or levels

for TXEN1, TXEN2, TXD1 and TXD2.

The LT3669 data sheet gives complete descriptions of the

part, operation and application information. The data sheet

must be read in conjunction with this quick start guide for

working on or modifying the demo circuit 1733A.

Design files for this circuit board are available.

Call the LT C Factory.

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

L+Input Supply 7.5 40 V

VBUCK Output Voltage Step-Down Regulator 4.75 5 5.25 V

VLDO Output Voltage LDO 3.135 3.3 3.465 V

IBUCK Maximum Buck Output Current LT3669, Step-Down Regulator VBUCK = 5V 100 mA

LT3669-2, Step-Down Regulator VBUCK = 5V 300 mA

ILDO Maximum LDO Output Current LT3669, VLDO = 3.3V 100 mA

LT3669-2, VLDO = 3.3V 150 mA

FSW Switching Frequency 600 kHz

EFF Efficiency LT3669, L+= 12V, VBUCK = 5V, IBUCK = 100mA 65 %

LT3669-2, L+= 12V, VBUCK = 5V, IBUCK = 300mA 76 %

TRST Reset Timeout Period C5=100nF 12.5 ms

Table 1. Version Table

ASSY TYPE U1 ILDO IBUCK C8 C9 D6 L1

DC1733A-A LT3669EUFD 0.1A 0.1A 10µF 0.1µF OPEN 82µH, CDRH4D22HPNP-820MC

DC1733A-B LT3669EUFD-2 0.15A 0.3A 22µF 0.22µF DFLS160 33µH, CDRH50D28RNP-330MC

dc1733af

DEMO MANUAL DC1733A

QUICK START PROCEDURE

Demonstration circuit 1733A is easy to set up to evaluate

the performance of the LT3669 or the LT3669-2. Refer to

Figure 1 for proper measurement 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 input or output voltage

ripplebytouchingtheprobetipdirectly across theterminals

of the input or output capacitors. See Figure 2 for proper

scope probe technique.

1. Place jumpers in the proper positions.

2. With power off, connect an input power supply to

L+ and L–/GND. The input supply can be a bench

power supply or can be from the respective output

from a master controller.

3. With power off, connect the load to VBUCK and GND.

4. With power off, connect another load to VLDO and GND.

5. Turn on the power at the input.

6. Check for the proper output voltages.

NOTE. If there is no output, temporarily disconnect

the load to make sure that the load is not set too high

or is shorted.

7. Once the proper output voltage is established, adjust

the loads within the operating range and observe the

output voltage regulation, ripple voltage, efficiency and

other parameters.

8. To test driver and receiver functions, use JP8 to JP11

to set up the proper signal sources or levels for TXEN1,

TXEN2, TXD1, and TXD2.

9. Set up or monitor other signals as needed.

10. Once the above signals are set up, observe driver’s

outputs and receiver’s inputs and outputs.

dc1733af

DEMO MANUAL DC1733A

QUICK START PROCEDURE

Figure1. Proper Measurement Equipment Setup

Figure2. Measuring Input or Output Ripple

dc1733af

DEMO MANUAL DC1733A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., C0G, 10pF, 25V, 5% 0402 AVX, 04023A100JAT2A

2 1 C5 CAP., X7R, 100nF, 25V, 10% 0402 AVX, 04023C104KAT2A

3 2 C6, C11 CAP., C0G, 470pF, 50V, 5% 0402 AVX, 04025A471JAT2A

4 1 C7 CAP., X7R, 1µF, 6.3V, 10% 0603 AVX, 06036C105KAT2A

5 1 C12 CAP., X7R, 4.7µF, 50V, 10% 1206 MURATA, GRM31CR71H475KA88L

6 3 C13, C15, C16 CAP., X5R, 0.1µF, 25V, 10% 0603 AVX, 06033D104KAT2A

7 4 D1, D2, D3, D4 TVS, SMCJ36A SMC Diodes Inc., SMCJ36A

8 2 R9, R21 RES., CHIP, 10K, 1/16W, 1% 0402 VISHAY, CRCW040210K0FKED

9 5 R10, R11, R14, R18, R25 RES., CHIP, 100K, 1/16W, 1% 0402 VISHAY, CRCW0402100KFKED

10 1 R12 RES., CHIP, 42.2K, 1/16W, 1% 0402 VISHAY, CRCW040242K2FKED

11 1 R13 RES., CHIP, 0Ω, 1/16W, 0402 VISHAY, CRCW04020000Z0ED

12 5 R15, R16, R26, R27, R28 RES., CHIP, 1K, 1/16W, 5% 0402 VISHAY, CRCW04021K00JKED

13 1 R17 RES., CHIP, 1M, 1/16W, 1% 0402 VISHAY, CRCW04021M00FKED

14 1 R19 RES., CHIP, 14K, 1/16W, 1% 0402 VISHAY, CRCW040214K0FKED

15 1 R20 RES., CHIP, 4.42K, 1/16W, 1% 0402 VISHAY, CRCW04024K42FKED

16 1 R22 RES., CHIP, 53.6K, 1/16W, 1% 0402 VISHAY, CRCW040253K6FKED

17 1 R23 RES., CHIP, 10.2K, 1/16W, 1% 0402 VISHAY, CRCW040210K2FKED

18 1 R24 RES., CHIP, 38.3K, 1/16W, 1% 0402 VISHAY, CRCW040238K3FKED

DC1733A-A Version Specific Components

1 1 C8 CAP., X5R, 10µF, 6.3V, 10% 0805 MURATA, GRM219R60J106KE19D

2 1 C9 CAP., X7R, 0.1µF, 10V, 10% 0402 TDK, C1005X7R1A104K

3 0 D6(OPEN) DIODE, POWER-DI-123

4 1 L1 INDUCTOR, 82µH SUMIDA, CDRH4D22HPNP-820MC

5 1 U1 IC., LT3669EUFD QFN 4X5, 29 PIN LINEAR TECH., LT3669EUFD#PBF

DC1733A-B Version Specific Components

1 1 C8 CAP., X5R, 22µF, 6.3V, 10% 0805 MURATA, GRM21BR60J226M

2 1 C9 CAP., X7R, 0.22µF, 10V, 10% 0402 TDK, C1005X7R1A224K

3 1 D6 DIODE, POWER-DI-123 Diodes Inc., DFLS160-7

4 1 L1 INDUCTOR, 33µH SUMIDA, CDRH50D28RNP-330MC

5 1 U1 IC., LT3669EUFD-2 QFN 4X5, 29 PIN LINEAR TECHNOLOGY CORPORATION, LT3669EUFD-2#PBF

Additional Demo Board Circuit Components

1 0 C10(OPT) CAP., 1206

2 0 C14(OPT) CAP., 0402

3 0 D5(OPT) DIODE, POWER-DI-123

Hardware: For Demo Board Only

1 21 E1-E21 TESTPOINT, TURRET, .094" pbf MILL-MAX, 2501-2-00-80-00-00-07-0

2 7 JP1-JP7 3 PIN 0.079 SINGLE ROW HEADER SULLINS, NRPN031PAEN-RC

3 4 JP8-JP11 2X4, 0.079 DOUBLE ROW HEADER SULLINS, NRPN042PAEN-RC

4 11 xJP1-xJP11 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G

5 1 J1 M12 CONNECTOR, 5 PIN BINDER, 09 3441 500 05

6 1 J2 CONNECTOR, OSTTV041150 On shore tech., OSTTV041150

7 1 J3 2X8, 0.079 DOUBLE ROW HEADER SULLINS, NRPN082PAEN-RC

8 4 (STAND-OFF) STAND-OFF, NYLON 0.25" KEYSTONE, 8831(SNAP ON)

dc1733af

DEMO MANUAL DC1733A

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.

Figure3. DC1733A Demo Circuit Schematic

SCHEMATIC DIAGRAM

SC1

RXD1

SC2

RST

SYNC

1. ALL RESISTORS ARE 0402

ALL CAPACITORS ARE 0402.

NOTE: UNLESS OTHERWISE SPECIFIED

ILIM

GND

CQ1-2

PAR OPEN

GND

RES

PAR OPEN

PAR OPEN LDOIN

VOUT

DIO

TXEN1

TXEN2

TXD1

TXD2

TXEN1-2

TXD1-2

7.5V - 40V

EN/UVLO

L+

RES

L+

L-/GND

CQ1

ASSY TYPE

VERSION TABEL

DC1733A-A

DC1733A-B

LT3669EUFD

LT3669EUFD-2

0.1uF

10uF

22uF 0.22uF

DFLS160

OPEN

33uH, CDRH50D28RNP-330MC

82uH, CDRH4D22HPNP-820MC

LDO BUCK

0.1A 0.1A

0.15A 0.3A

RXD1

SC1

SYNC

SC2

WAKE

SC1

SYNC

RST

TXEN2-J

TXD2-J

TXD1-J

RXD1

TXEN1-J

GND

TXEN1-J

GND

TXEN2-J

TXD1-J

TXD2-J

SC2

RST

3.3V

EXPOSED

PAD

EXPOSED

PAD

SC1

SC2

WAKE 3

RXD1

TXEN1

TXD1

6TXEN2

TXD2

Q2 9

L+ 11

EN/UVLO 12

DIO 13

DA 14

SW 15

BST 16

BD 17

LDO_IN 18

LDO 19

FB_LDO 20

FB_OUT 21

RT 22

AGND

SYNC

ILIM

CPOR

RST

GND

CQ1 10

6.3V

0805

6.3V

0805

E13E13

JP9JP9

1 2

470pF

50V

470pF

50V

CON-OSTTV041150

R27 1K

100nF

E14

GND

E14

GND

R15 1K

E11

L+

JP2JP2

R20

4.42K

R20

4.42K

D2D2

WAKE

R16 1K

E21

GND

E21

GND

C10

OPT

1206

C10

OPT

1206

JP8JP8

1 2

R14

100K

R14

100K

D3D3

R17

E17

TXEN1

E17

TXEN1

10pF

E15

GND

E15

GND

C14

OPT

C14

OPT

E5 3.3V / I

LDO

E5 3.3V / I

LDO

JP1JP1

R22

53.6K

R22

53.6K

E4E4

JP10JP10

1 2

E10

CQ1

E10

CQ1

C12

4.7uF

50V

1206

C12

4.7uF

50V

1206

JP7JP7

R11 100K

R18

100K

R18

100K

1uF

6.3V

0603

1uF

6.3V

0603

JP3JP3

R23

10.2K

R23

10.2K

JP4JP4

C13

0.1uF

6.3V

0603

C13

0.1uF

6.3V

0603

R26 1K

10K

E2E2

E16

EN/UVLO

E16

EN/UVLO

E6 5V / I

BUCK

E6 5V / I

BUCK

R24

38.3K

R24

38.3K

E18

TXEN2

E18

TXEN2

JP6JP6

E19

TXD1

E19

TXD1

R21

10K

R21

10K

GND

HEADER 2X8 2MM

E12

L-/GND

E12

L-/GND

C11

470pF

50V

C11

470pF

50V

C16

0.1uF

6.3V

0603

C16

0.1uF

6.3V

0603

SMCJ36A

JP5JP5

JP11JP11

1 2

R10

100K

R10

100K

R25

100K

R25

100K

R28

E1E1

C15

0.1uF

6.3V

0603

C15

0.1uF

6.3V

0603

E20

TXD2

E20

TXD2

E3E3

OPT

R12

42.2K

R12

42.2K

SMCJ36A

R19

14K

R19

14K

R13

M12-MALE-5PIN

5 S2

dc1733af

DEMO MANUAL DC1733A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2014

LT 0614 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) 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 LT C 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 LT C 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.

LT C 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 LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC1733A-B DC1733A-A

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