DC1733A - Demo Manual

DEMO MANUAL DC1733A
LT3669
Industrial Transceiver with Integrated
Step-Down Regulator and LDO
DESCRIPTION
Demonstration circuit 1733A is an industrial transceiver
with integrated step-down regulator and LDO featuring the
LT®3669. The board operates from 7.5V to 40V when JP7 is
set to L+. When the JP7 is set to RES, the minimum input
voltage is 16.5V. The board withstands transients up to
60V. The step-down regulator output is 5V. The LDO output
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.
PERFORMANCE SUMMARY
SYMBOL
L+
Input Supply
VBUCK
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 LTC Factory.
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..
Specifications are at TA = 25°C
CONDITIONS
MIN
Output Voltage
Step-Down Regulator
VLDO
Output Voltage
LDO
IBUCK
Maximum Buck Output Current
LT3669, Step-Down Regulator VBUCK = 5V
100
mA
LT3669-2, Step-Down Regulator VBUCK = 5V
300
mA
LT3669, VLDO = 3.3V
100
mA
LT3669-2, VLDO = 3.3V
150
mA
ILDO
FSW
EFF
PARAMETER
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.
TYP
MAX
40
V
4.75
5
5.25
V
3.135
3.3
3.465
V
7.5
Maximum LDO Output Current
Switching Frequency
600
LT3669, L+ = 12V, V
Efficiency
BUCK = 5V, IBUCK = 100mA
LT3669-2, L+ = 12V, VBUCK = 5V, IBUCK = 300mA
TRST
Reset Timeout Period
C5=100nF
UNITS
kHz
65
%
76
%
12.5
ms
Table 1. Version Table
ASSY TYPE
U1
ILDO
IBUCK
C8
DC1733A-A
DC1733A-B
LT3669EUFD
0.1A
0.1A
10µF
LT3669EUFD-2
0.15A
0.3A
22µF
C9
D6
L1
0.1µF
OPEN
82µH, CDRH4D22HPNP-820MC
0.22µF
DFLS160
33µH, CDRH50D28RNP-330MC
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1
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
ripple by touching the probe tip directly across the terminals
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.
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.
4. With power off, connect another load to VLDO and GND.
2
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DEMO MANUAL DC1733A
QUICK START PROCEDURE
Figure 1. Proper Measurement Equipment Setup
Figure 2. Measuring Input or Output Ripple
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3
DEMO MANUAL DC1733A
PARTS LIST
ITEM
QTY REFERENCE
Required Circuit Components
1
1
C1
2
1
C5
3
2
C6, C11
4
1
C7
5
1
C12
6
3
C13, C15, C16
7
4
D1, D2, D3, D4
8
2
R9, R21
9
5
R10, R11, R14, R18, R25
10
1
R12
11
1
R13
12
5
R15, R16, R26, R27, R28
13
1
R17
14
1
R19
15
1
R20
16
1
R22
17
1
R23
18
1
R24
DC1733A-A Version Specific Components
1
1
C8
2
1
C9
3
0
D6(OPEN)
4
1
L1
5
1
U1
DC1733A-B Version Specific Components
1
1
C8
2
1
C9
3
1
D6
4
1
L1
5
1
U1
Additional Demo Board Circuit Components
1
0
C10(OPT)
2
0
C14(OPT)
3
0
D5(OPT)
Hardware: For Demo Board Only
1
21 E1-E21
PART DESCRIPTION
MANUFACTURER/PART NUMBER
CAP., C0G, 10pF, 25V, 5% 0402
CAP., X7R, 100nF, 25V, 10% 0402
CAP., C0G, 470pF, 50V, 5% 0402
CAP., X7R, 1µF, 6.3V, 10% 0603
CAP., X7R, 4.7µF, 50V, 10% 1206
CAP., X5R, 0.1µF, 25V, 10% 0603
TVS, SMCJ36A SMC
RES., CHIP, 10K, 1/16W, 1% 0402
RES., CHIP, 100K, 1/16W, 1% 0402
RES., CHIP, 42.2K, 1/16W, 1% 0402
RES., CHIP, 0Ω, 1/16W, 0402
RES., CHIP, 1K, 1/16W, 5% 0402
RES., CHIP, 1M, 1/16W, 1% 0402
RES., CHIP, 14K, 1/16W, 1% 0402
RES., CHIP, 4.42K, 1/16W, 1% 0402
RES., CHIP, 53.6K, 1/16W, 1% 0402
RES., CHIP, 10.2K, 1/16W, 1% 0402
RES., CHIP, 38.3K, 1/16W, 1% 0402
AVX, 04023A100JAT2A
AVX, 04023C104KAT2A
AVX, 04025A471JAT2A
AVX, 06036C105KAT2A
MURATA, GRM31CR71H475KA88L
AVX, 06033D104KAT2A
Diodes Inc., SMCJ36A
VISHAY, CRCW040210K0FKED
VISHAY, CRCW0402100KFKED
VISHAY, CRCW040242K2FKED
VISHAY, CRCW04020000Z0ED
VISHAY, CRCW04021K00JKED
VISHAY, CRCW04021M00FKED
VISHAY, CRCW040214K0FKED
VISHAY, CRCW04024K42FKED
VISHAY, CRCW040253K6FKED
VISHAY, CRCW040210K2FKED
VISHAY, CRCW040238K3FKED
CAP., X5R, 10µF, 6.3V, 10% 0805
CAP., X7R, 0.1µF, 10V, 10% 0402
DIODE, POWER-DI-123
INDUCTOR, 82µH
IC., LT3669EUFD QFN 4X5, 29 PIN
MURATA, GRM219R60J106KE19D
TDK, C1005X7R1A104K
CAP., X5R, 22µF, 6.3V, 10% 0805
CAP., X7R, 0.22µF, 10V, 10% 0402
DIODE, POWER-DI-123
INDUCTOR, 33µH
IC., LT3669EUFD-2 QFN 4X5, 29 PIN
MURATA, GRM21BR60J226M
TDK, C1005X7R1A224K
Diodes Inc., DFLS160-7
SUMIDA, CDRH50D28RNP-330MC
LINEAR TECHNOLOGY CORPORATION, LT3669EUFD-2#PBF
SUMIDA, CDRH4D22HPNP-820MC
LINEAR TECH., LT3669EUFD#PBF
CAP., 1206
CAP., 0402
DIODE, POWER-DI-123
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)
4
dc1733af
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.
A
B
C
D
J3
9
8
7
6
5
4
3
2
1
16
15
14
13
12
11
10
TXD2-J
TXD1-J
TXEN2-J
DC1733A-B
5
0.15A
I LDO
0.1A
LT3669EUFD
LT3669EUFD-2
DC1733A-A
HEADER 2X8 2MM
E20
E19
E18
TXEN1-J
VERSION TABEL
ASSY TYPE
U1
*
TXD2
TXD1
TXEN2
E17
5V
8
2
4
6
8
2
4
6
8
GND 1
3
5
5V 7
GND 1
3
5
5V 7
0.3A
0.1A
I BUCK
SYNC
RST
SC1
SC2
WAKE
RXD1
TXEN1-J
TXD1-J
TXEN2-J
5V
3.3V
6
5
5V 7
TXD2-J
4
8
3
6
5
2
4
3
5V 7
GND 1
2
GND 1
C8
22uF
10uF
E4
E3
E2
R10
100K
R13
0
5V
RXD1
RES
GND
5V
GND
0.22uF
C9
0.1uF
4
OPEN
DFLS160
D6
L1
SYNC
10pF
24
25
26
27
*
SYNC
SR
ILIM
CPOR
RST
SC2
SC1
RXD1
TXD2
TXD1
TXEN2
TXEN1
U1
3
3
E7
PAD
EXPOSED
WAKE
WAKE
EN/UVLO
CQ1
Q2
L+
RT
DIO
FB_OUT
DA
SW
BST
BD
LDO_IN
FB_LDO
LDO
R21
10K
5V
12
10
9
11
22
13
21
14
15
16
17
18
20
19
*
PAR
1
D6
3
*
L1
C14
OPT
C11
470pF
50V
2
R18
100K
R17
1M
D5
OPT
RES
L+
50V
1206
R23
10.2K
R22
53.6K
JP7
EN/UVLO
2
DIO
2
C13
0.1uF VOUT
6.3V
0603
C7
1uF
6.3V
0603
2
C6
470pF
50V
C12
4.7uF
C10
OPT
1206
6.3V
0805
OPEN
JP3
CQ1-2
38.3K
R24
*
*
C9
C8
R20
4.42K
R19
14K
Figure 3. DC1733A Demo Circuit Schematic
82uH, CDRH4D22HPNP-820MC
33uH, CDRH50D28RNP-330MC
1. ALL RESISTORS ARE 0402
ALL CAPACITORS ARE 0402.
2
28
1
4
SC2
RXD1
8
6
7
5
SC1
C1
R14
100K
SR
5V JP2
2
5V
RST
E1
R9
10K
C5
100nF
5V R11 100K
E13
ILIM
JP1
SC1
R25
100K
PAR OPEN
1
3 JP5
TXD1-2
PAR OPEN
1
3
JP6
TXEN1-2
R12
42.2K
2
5V
R27 1K
R26 1K
R16 1K
R15 1K
NOTE: UNLESS OTHERWISE SPECIFIED
SYNC
RST
SC2
JP11
TXD2
JP10
TXD1
JP9
TXEN2
JP8
TXEN1
2
2
1
3
4
1
3
3
WAKE
GND
29
AGND
23
3
1
2
3
1
TXEN1
5
JP4
E11
SMCJ36A
D2
1K
R28
D1
E9
C15
0.1uF
6.3V
0603
CQ1
E10
D4
SMCJ36A
E12
L-/GND
C16
0.1uF
6.3V
0603
5V
D3
L+
7.5V - 40V Q2
LDOIN
3.3V
V LDO
J1
3
2
1
GND
GND
GND
CQ1
4
1
E16
EN/UVLO
CON-OSTTV041150
3
2
L+
Q2
L-/GND
J2
1
*
*
5V / I BUCK
V BUCK
GND
3.3V / I LDO
4
S1
5 S2
M12-MALE-5PIN
E21
E8
E15
E6
E14
E5
1
A
B
C
D
DEMO MANUAL DC1733A
SCHEMATIC DIAGRAM
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5
DEMO MANUAL DC1733A
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
6
dc1733af
Linear Technology Corporation
LT 0614 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014
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