Linear Technology LTM8046 User guide

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dc1559af
DEMO MANUAL DC1559A
DESCRIPTION
LTM8046
3.1VIN to 32VIN, 2kV Isolated
DC/DC µModule Converter
The demo circuit 1559A features the LTM8046, a 2kVAC,
2.5W isolated flyback μModule
®
converter. The demo
circuit is designed for a 5V output from a 3.2V to 26V
input. The typical current capability of the 5V output varies
with input voltage from about 150mA at VIN = 4V to about
550mA at VIN = 26V. R2 provides the necessary minimum
load current to keep the VOUT in regulation throughout the
entire input voltage range. Please see the Typical Perfor-
mance Characteristics curves in the LTM8046 data sheet
to determine the minimum load current for other input/
output configurations.
L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
The LTM8046 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 1559A.
Design files for this circuit board are available at
http://www.linear.com/demo
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Supply Range 3.2 26 V
VOUT Output Voltage 4.75 5 5.25 V
VOUT(AC) Output Ripple VIN = 12V, IOUT = 300mA 50 mV
Specifications are at TA= 25°C

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dc1559af
DEMO MANUAL DC1559 A
QUICK START PROCEDURE
Demo circuit 1559A is an easy way to evaluate the per-
formance of the LTM8046. 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:Makesurethattheinputvoltagedoes not exceed 26V.
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)
100
300
400
500
700
614 18
200
600
12 22 2624
810 16 20
FREQUENCY (MHz)
–120
INTENSITY (dBm)
–80
–40
0
–100
–60
–20
1 2 3 4 5
0.50 1.5 2.5 3.5 4.5
Figure 1. VOUT Maximum Output Current vs VIN Figure 2. VOUT Output Noise Spectrum with IOUT at 300mA
and VIN at 12V

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DEMO MANUAL DC1559A
QUICK START PROCEDURE
Figure 3. DC1559A Proper Equipment Setup
Figure 4. Measuring Input or Output Ripple

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dc1559af
DEMO MANUAL DC1559 A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C1 CAP., CHIP, X7R, 4.7µF, 50V, 10%, 1206 Taiyo Yuden, UMK316BJ475K LT
2 1 C2 CAP., CHIP, X5R, 100µF, 10V, 20%, 1206 TDK, C3216X5R1A107M160AC
3 1 C3 CAP., CHIP, X7R, 4.7µF, 25V, 10%, 0805 TDK, C2012X7R1E475K125AB
4 1 C4 CAP., CHIP, X7R, 0.1µF, 25V, 10%, 0603 AVX, 06033C104KAT2A
5 1 C6 CAP., CHIP, X7R, 1µF, 10V, 10%, 0603 AVX, 0603ZC105KAT2A
6 1 R1 RES., CHIP, 102k, 1%, 1/10W 0603 YAGEO, RC0603FR-07102KL
7 1 R2 RES., CHIP, 100Ω, 1/4W, 1%, 1206 YAGEO, RC1206FR-07100RL
8 1 R3 RES., CHIP, 90.9k, 1%, 1/10W, 1% 0603 YAGEO, RC0603FR-0790K9L
9 1 R4 RES., CHIP, 8.45k, 1%, 1/10W 0603 VISHAY, CRCW06038K45FKEA
10 1 U1 IC., LINEAR LTM8046EY#PBF LINEAR TECH., LTM8046EY#PBF
Additional Demo Board Circuit Components
1 1 CIN1 CAP., TANT, 10µF, 35V, CASE-C AVX, TAJC106K035R
2 0 C5 OPT. 1206
3 0 C7 OPT. 1210
4 0 L1 OPT.
Hardware-For Demo Board Only
1 4 E1-E4 TESTPOINT, TURRET, 0.094" MILL-MAX 2501-2-00-80-00-00-07-0
2 2 E5, E6 TESTPOINT, TURRET, 0.064" MILL-MAX 2308-2-00-80-00-00-07-0

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dc1559af
DEMO MANUAL DC1559A
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
3.2V - 26V
5V
1206
0805
1206
1206
OPT
1% 1%
1%
1. ALL RESISTORS ARE 0603. ALL CAPACITORS ARE 0603.
NOTE: UNLESS OTHERWISE SPECIFIED
*
*
**
SEE DEMO MANUAL FOR OUTPUT CURRENT CAPABILITY.
**
IF VIN IS BELOW OR EQUAL TO 4.3V, USE R5=0. IF VIN IS ABOVE 4.3V, LEAVE R5 OPEN.
R
VIN VIN
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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.
www.linear.com
4
DEMO CIRCUIT 1559A
Tuesday, May 13, 2014 11
2kV AC 2.5W ISOLATED µMODULE DC/DC CONVERTER
N/A
LTM8046EY
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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.
www.linear.com
4
DEMO CIRCUIT 1559A
Tuesday, May 13, 2014 11
2kV AC 2.5W ISOLATED µMODULE DC/DC CONVERTER
N/A
LTM8046EY
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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.
www.linear.com
4
DEMO CIRCUIT 1559A
Tuesday, May 13, 2014 11
2kV AC 2.5W ISOLATED µMODULE DC/DC CONVERTER
N/A
LTM8046EY
E3
VOUT
E3
VOUT
E2
GND E2 GND
C3
4.7uF 25V
C3
4.7uF 25V
U1
LTM8046EY
U1
LTM8046EY
RUN
L3
BIAS
L4
SS
L5
VIN
J1
FB
L6
VIN
K1
VIN
L1
GND
G1
GND
G2
GND
G3
GND
G4
GND
G5
GND
G6
GND
G7
GND
H3
GND
H4
GND
H5
GND
H6
GND
H7
GND
J3
GND
J4
GND
J5
GND
J6
GND
J7
GND
K3
GND
K4
GND
K5
GND
K6
GND
K7
GND
L7
VOUT- C1 VOUT- C2 VOUT- C3 VOUT- C4 VOUT- C5 VOUT- C6 VOUT- C7
VOUT B4
VOUT- B5 VOUT- B6 VOUT- B7
VOUT A4
VOUT- A5 VOUT- A6 VOUT- A7
VOUT A1 VOUT A2 VOUT A3 VOUT B1 VOUT B2 VOUT B3
C5
OPT
C5
OPT
R1 102k R1 102k C7
OPT 1210
C7
OPT 1210
R2 100 1206 R2 100 1206
E5
SHDN E5 SHDN
E6
BIAS E6 BIAS
L1L1
C2 100uF 10V C2 100uF 10V
E1
VIN
E1
VIN
E4 VOUT- E4 VOUT-
C1
4.7uF
50V
C1
4.7uF
50V
R4
8.45k
R4
8.45k
R3 90.9k R3 90.9k
+
10uF
35V
CIN1
+
10uF
35V
CIN1
R5 OPT R5 OPT
C6
1uF
C6
1uF
C4
0.1uF
25V C4
0.1uF
25V

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DEMO MANUAL DC1559 A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014
LT 0714 • 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
Copyright © 2004, Linear Technology Corporation

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