1
dc1693afa
DEMO MANUAL DC1693A
Description
LTM8047
725V Isolated DC/DC
μModule Converter
The demo circuit 1693A is an isolated flyback μModule
®
DC/DC converter featuring the LTM8047. The demo circuit
is designed for a 5V output from a 4.5V to 30V input.
The typical current capability of the 5V output varies with
input voltage from about 110mA at VIN = 4.5V to about
350mA at VIN = 30V.
L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
perForMAnce sUMMArY
BoArD photo
The LTM8047 data sheet gives complete description of the
device, operation and application information. The data
sheet must be read in conjunction with this demo manual
prior to working on or modifying demo circuit 1693A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1693A
(TA = 25°C)
PARAMETER CONDITIONS VALUE
Input Voltage Range 4.5V to 30V
Output Voltage VOUT VIN = 4.5V to 30V 5.0V
Voltage Ripple VOUT VIN = 12V, IOUT = 100mA <20mV
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dc1693afa
DEMO MANUAL DC1693A
qUick stArt proceDUre
Figure 1. VOUT Typical Maximum Output Current vs VIN
Figure 2. VOUT Output Noise Spectrum with IOUT at 100mA and VIN at 12V
Demo circuit 1693A is an easy way to evaluate the per-
formance of the LTM8047. Refer to Figure 3 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 VIN or
VOUT and GND terminals. See Figure 4 for proper scope
probe technique.
1. With power off, connect the input power supply to VIN
and GND.
2. Turn on the power at the input.
NOTE: Make sure that the input voltage does not exceed 30V.
3. Check for the proper output voltage between VOUT and
VOUT–.
NOTE: If there is no output, temporarily disconnect the
load to make sure that the load is not set too high.
4. Once the proper output voltage is established, adjust
the load within the operating range and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters.
VIN (V)
4
0
OUTPUT CURRENT (mA)
300
250
200
150
100
50
500
350
400
450
6 16 18 20 22 24 26 28 308 10 12
dc1693a F01
14
FREQUENCY (MHz)
0
–120
INTENSITY (dBm)
–20
–40
–60
–80
–100
0
0.5 3 3.5 4 4.5 51 1.5 2
dc1693 F02
2.5
3
dc1693afa
DEMO MANUAL DC1693A
qUick stArt proceDUre
dc1693a F03
GND
VIN
Figure 3. DC1693A Proper Equipment Setup
Figure 4. Measuring Input or Output Ripple
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DEMO MANUAL DC1693A
pArts list
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C6 CAP., CHIP X7R, 0.1µF, 25V, 10%, 0603 AVX 06033C104KAT
2 1 C4 CAP., CHIP X5R, 4.7µF, 50V, 10%, 0805 TDK C2012X5R1H475K
3 1 C2 CAP., CHIP X5R, 22µF, 16V, 10%, 1206 AVX 1206YD226KAT2A
4 1 C1 CAP., CHIP X5R, 10µF, 50V, 10%, 1210 MURATA GRM32ER71H106KA12L
5 1 R1 RES., CHIP 200, 1%, 1210 VISHAY CRCW1210200RFKEA
6 1 R2 RES., CHIP 200k, 1%, 0603 VISHAY CRCW0603200KFKEA
7 1 R3 RES., CHIP 90.9k, 1%, 0603 VISHAY CRCW060390K9FKED
8 1 R5 RES., CHIP 6.98k, 1/10W, 1%, 0603 VISHAY CRCW06036K98FKEA
9 1 U1 IC., LINEAR LTM8047EY#PBF LINEAR TECH., LTM8047EY#PBF
Additional Demo Board Circuit Components
1 0 C8 CAP, 1210, OPTION
2 1 CIN1 CAP., TANT., 10µF, 35V, CASE-C AVX TAJC106K035R
3 0 C7 CAP, 1812, OPTION
4 0 L1 OPTION
5 0 R6 RES., 0603, OPTION
Hardware For Demo Board Only
1 4 E1-E4 Testpoint, Turret,.094" Mill-Max 2501-2-00-80-00-00-07-0
2 2 E5, E8 Testpoint, Turret,.064" Mill-Max 2308-2-00-80-00-00-07-0
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dc1693afa
DEMO MANUAL DC1693A
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
A
A
B
B
C
C
D
D
E
E
4 4
3 3
2 2
1 1
4.5V - 30V
FOR INPUT VOLTAGE DAMPING PURPOSE ONLY.
0805
1206
OPT 5V
*
1%
1%
1%
1. ALL RESISTORS ARE 0603.
ALL CAPACITORS ARE 0603.
NOTE: UNLESS OTHERWISE SPECIFIED
*
** SEE QUICK START GUIDE FOR OUTPUT CURRENT RANGE.
**
R
1-1 REBUILD CHANGE R5 EDWIN L. 10-15-13
VIN VIN
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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
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
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1-1
Tuesday, October 15, 2013
11
ISOLATED MODULE DC/DC CONVERTER
JW
EDWIN L.
N/A
LTM8047EY
DEMO CIRCUIT 1693A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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
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
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1-1
Tuesday, October 15, 2013
11
ISOLATED MODULE DC/DC CONVERTER
JW
EDWIN L.
N/A
LTM8047EY
DEMO CIRCUIT 1693A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
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
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
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1-1
Tuesday, October 15, 2013
11
ISOLATED MODULE DC/DC CONVERTER
JW
EDWIN L.
N/A
LTM8047EY
DEMO CIRCUIT 1693A
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
EDWIN L.PRODUCTION1 08-08-11
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
EDWIN L.PRODUCTION1 08-08-11
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
EDWIN L.PRODUCTION1 08-08-11
__
E2
GND E2
GND
E3
VOUT
E3
VOUT
R1
200
1210
R1
200
1210
R6
OPT
R6
OPT
C8
OPT
1210
C8
OPT
1210
C7
0.033uF
OPT
1000V
1812
C7
0.033uF
OPT
1000V
1812
R2
200k
R2
200k
C1
10uF
1210
50V
C1
10uF
1210
50V
R5
6.98k
R5
6.98k
C4
4.7uF
50V
C4
4.7uF
50V
E1
VIN
E1
VIN
C2
22uF
16V
C2
22uF
16V
L1
10uH
CDRH4D22/HP
L1
10uH
CDRH4D22/HP
E8
BIAS E8
BIAS
E5
RUN E5
RUN
E4 VOUT-
E4 VOUT-
+
10uF
35V
CIN1
+
10uF
35V
CIN1
U1
LTM8047EY
U1
LTM8047EY
RUN
F3
GND
E4
BIAS
H5
VOUT A6
SS
H6
VIN
G1
GND
F7
VOUT- A2
VOUT- A3
VIN
H1
GND
E5
GND
E6
GND
E7
GND
F4
GND
F5
GND
F6
GND
G4
GND
G5
GND
E3
VOUT- A4
VOUT- A5
VOUT- B3
VOUT- B4
VOUT- B5
VOUT- C3
VOUT- C4
VOUT A7
VOUT B6
VOUT B7
VOUT C6
VOUT C7
VIN
G2
VIN
H2
VOUT- B2
VOUT- C2
VOUT- C1
VOUT- B1
VOUT- A1
VOUT- C5
ADJ
G7
GND
G6
GND
H4
GND
E2 GND
E1
GND
H7
R3
90.9k
R3
90.9k
C6
0.1uF
25V
C6
0.1uF
25V
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dc1693afa
DEMO MANUAL DC1693A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2011
LT 0114 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 applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation