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DCMSW1 SERIES
1 Watt DC/DC Power Converters
Rev A
FEATURES
• 1 Watt Output Power
• 2:1 Wide Input Voltage Range
• 1500VDC I/O Isolation
• -40°C to +85°C Operating Temperature
• Low Ripple & Noise
• Continuous Short Circuit Protection
• Remote ON/OFF Control
• Ultra Compact SMT Package
• Fully Regulated Single & Dual Outputs
• Qualified for Lead-free Reflow Process
• MTBF > 2,800,000 Hours
• CSA/UL/IEC/EN 60950-1 Safety Approvals
(Pending)
DESCRIPTION
Size:
0.74 x 0.54 x 0.33 inches
(4.5g)
18.9 x 13.7 x 8.45 mm
Weight:
0.16oz
The DCMSW1 series of DC/DC converters provides 1 Watt of output power in an ultra compact
SMT package. These converters operate over 2:1 input voltage ranges of 4.5-9VDC, 9-18VDC,
18-36VDC, and 36-75VDC. This series also has fully regulated single and dual output voltages
of 5V, 12V, 15V, ±12V, and ±15V. The DCMSW1 series’ impressive efficiencies enable these
modules to deliver their fully rated output power from –40°C to +75°C without derating. Other
features include remote on/off control, low ripple and noise, 1500VDC I/O isolation, and
continuous short circuit protection. The very small footprint of these converters makes them an
ideal solution for space critical applications in communication equipment, instrumentation, and
many other battery operated applications.
MODEL SELECTION TABLE
SINGLE OUTPUT MODELS
Model Number
DCMSW1-05S05
DCMSW1-05S12
DCMSW1-05S15
DCMSW1-12S05
DCMSW1-12S12
DCMSW1-12S15
DCMSW1-24S05
DCMSW1-24S12
DCMSW1-24S15
DCMSW1-48S05
DCMSW1-48S12
DCMSW1-48S15
Input
Voltage
5 VDC
(4.5 - 9
VDC)
12 VDC
(9 - 18
VDC)
24 VDC
(18 - 36
VDC)
48 VDC
(36 - 75
VDC)
Output
Voltage
5 VDC
12 VDC
15 VDC
5 VDC
12 VDC
15 VDC
5 VDC
12 VDC
15 VDC
5 VDC
12 VDC
15 VDC
Output Current
Min
Max
0mA 200mA
0mA
83mA
0mA
67mA
0mA 200mA
0mA
83mA
0mA
67mA
0mA 200mA
0mA
83mA
0mA
67mA
0mA 200mA
0mA
83mA
0mA
67mA
Input
Voltage
5 VDC
(4.5 - 9
VDC)
12 VDC
(9 - 18
VDC)
24 VDC
(18 - 36
VDC)
48 VDC
(36 - 75
VDC)
Output
Voltage
±12 VDC
Output Current
Min
Max
0mA ±42mA
±15 VDC
0mA
±33mA
±12 VDC
0mA
±42mA
Input Current
Reflected
No Load Max Load Ripple Current
256mA
252mA
40mA
80mA
248mA
105mA
105mA
20mA
40mA
102mA
53mA
51mA
10mA
30mA
51mA
26mA
26mA
7mA
20mA
26mA
Output
Power
1W
1W
1W
1W
1W
1W
1W
1W
1W
1W
1W
1W
Efficiency
78%
79%
81%
79%
79%
82%
79%
82%
82%
79%
80%
80%
Maximum
Capacitive Load
1680µF
820µF
680µF
1680µF
820µF
680µF
1680µF
820µF
680µF
1680µF
820µF
680µF
DUAL OUTPUT MODELS
Model Number
DCMSW1-05D12
DCMSW1-05D15
DCMSW1-12D12
DCMSW1-12D15
DCMSW1-24D12
DCMSW1-24D15
DCMSW1-48D12
DCMSW1-48D15
±15 VDC
0mA
±33mA
±12 VDC
0mA
±42mA
±15 VDC
0mA
±33mA
±12 VDC
0mA
±42mA
±15 VDC
0mA
±33mA
Input Current
Reflected
No Load Max Load Ripple Current
255mA
40mA
80mA
248mA
104mA
20mA
103mA
40mA
51mA
10mA
50mA
30mA
26mA
7mA
25mA
20mA
Output
Power
1W
79%
Maximum
Capacitive Load
±470µF
1W
80%
±330µF
1W
81%
±470µF
1W
80%
±330µF
1W
82%
±470µF
1W
82%
±330µF
1W
81%
±470µF
1W
81%
±330µF
Efficiency
NOTES
1. All DC/DC converters should be externally fused at the front end for protection.
2. Other input and output voltages may be available, please contact factory.
*Due to advances in technology, specifications are subject to change without notice.
12/17/2013
Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-7789797
website: www.wallindustries.com • e-mail: sales@wallindustries.com
Page 1 of 5
DCMSW1 SERIES
1 Watt DC/DC Power Converters
Rev A
SPECIFICATIONS: DCMSW1 SERIES
All specifications are based on 25°C, Nominal Input Voltage, and Maximum Output Current unless otherwise noted.
We reserve the right to change specifications based on technological advances.
SPECIFICATION
TEST CONDITIONS
Min
Typ
4.5
9
18
36
-0.7
-0.7
-0.7
-0.7
5
12
24
48
Max
Unit
INPUT SPECIFICATIONS
Input Voltage Range
Input Surge Voltage (1sec, max.)
Start-Up Threshold Voltage
5VDC nominal input models
12VDC nominal input models
24 VDC nominal input models
48 VDC nominal input models
5VDC nominal input models
12VDC nominal input models
24 VDC nominal input models
48 VDC nominal input models
5VDC nominal input models
12VDC nominal input models
24 VDC nominal input models
48 VDC nominal input models
Input Current
Input Filter
5VDC nominal input models
12VDC nominal input models
24 VDC nominal input models
48 VDC nominal input models
Input Fuse
OUTPUT SPECIFICATIONS
Output Voltage
Output Voltage Setting Accuracy
Line Regulation
Load Regulation
10% load to 90% load
Minimum Load
Output Power
Output Current
Maximum Capacitive Load
Ripple & Noise
Transient Recovery Time
Temperature Coefficient
PROTECTION
Short Circuit Protection
REMOTE ON/OFF CONTROL
Converter ON
Converter OFF
Standby Input Current
GENERAL SPECIFICATIONS
Efficiency
Switching Frequency
Isolation Voltage (I/P to O/P)
Isolation Resistance (I/P to O/P)
Isolation Capacitance (I/P to O/P)
ENVIRONMENTAL SPECIFICATIONS
Operating Ambient Temperature
Case Temperature
Storage Temperature
Relative Humidity
Cooling
Lead Temperature
MTBF
PHYSICAL SPECIFICATIONS
Weight
12/17/2013
Single Output Models
Dual Output Models
Single Output Models
Dual Output Models
0
1
See Table
See Table
30
250
±0.02
Measurement bandwidth is 0-20MHz
25% load step change
VDC
VDC
VDC
%Vnom
%
%
%
mA
W
mVp-p
µs
%/°C
continuous
Open or high impedance
2~4mA current applied via 1KΩ resistor
2.5
mA
Supply Off & Nominal Vin
Nominal input voltage and full load
See Table
220
60 seconds
500VDC
100KHz, 1V
1500
1000
50
See derating curve
Flammability to UL 94V-0 rated
KHz
VDC
MΩ
pF
-40
Non-condensing
Natural convection is about 20LFM but is not equal to still air (0LFM)
1.5mm from case for 10 sec.
MIL-HDBK-217F at 25°C, ground benign
Dimensions (L x W x H)
Case Material
Pin Material
SAFETY
Safety Approvals
See Table
±1.0
±0.2
±1.0
±1.0
±0.5
±0.8
Nominal input and half load
Low line to high line
Min load to full load
9
18
36
75
15
25
50
100
4.5
9
18
36
See Table
capacitor
500mA slow-blow type
250mA slow-blow type
120mA slow-blow type
60mA slow-blow type
+85
°C
+95
°C
-50
+125
°C
95
% RH
Free air convection (20LFM)
260
°C
2,800,000
hours
0.16oz (4.5g)
0.74 x 0.54 x 0.33 inch (18.9 x 13.7 x 8.45
mm)
Non-conductive black plastic
Phosphor bronze
CSA 60950-1 recognition, IEC/EN 60950-1 (CB-scheme) pending
Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-7789797
website: www.wallindustries.com • e-mail: sales@wallindustries.com
Page 2 of 5
Rev A
DCMSW1 SERIES
1 Watt DC/DC Power Converters
DERATING CURVE
MECHANICAL DRAWING
Mechanical Dimensions
12/17/2013
Connecting Pin Patterns
Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-7789797
website: www.wallindustries.com • e-mail: sales@wallindustries.com
Page 3 of 5
Rev A
DCMSW1 SERIES
1 Watt DC/DC Power Converters
TEST SETUP
Input Reflected-Ripple Current Test Setup
Input reflected-ripple current is measured with an inductor Lin (4.7µH) and Cin (220µF, ESR < 1.0Ω at 100 KHz) to simulate
source impedance. Capacitor Cin offsets possible battery impedance. Current ripple is measured at the input terminals of the
module. Measurement bandwidth is 0-500 KHz.
Peak-to-Peak Output Noise Measurement Test
Use a 0.47µF ceramic capacitor. Scope measurement should be made by using a BNC socket, measurement bandwidth is 020MHz. Position the load between 50mm and 75mm from the DC/DC converter.
DESIGN & FEATURE CONSIDERATIONS
Remote On/Off
Negative logic remote on/off turns the module OFF during a logic high voltage on the remote on/off pin and ON during a logic
low. To turn the module on and off, the user must supply a switch to control the voltage between the on/off terminal and the –
Vin terminal. The switch can be an open collector or equivalent. A logic high is 2~4mA current applied via 1KΩ resistor. A
logic low is open circuit or high impedance.
Maximum Capacitive Load
The DCMSW1 series has a limitation of maximum connected capacitance on the output. The power module may be operated
in current limiting mode during start-up, affecting the ramp-up and the start-up time. The maximum capacitance can be found
in the Model Selection Table.
Over Current Protection
To provide protection in a fault (output overload) condition, the unit is equipped with internal current limiting circuitry and can
endure overload for an unlimited duration. At the point of current-limit inception, the unit shifts from voltage control to current
control. The unit operates normally once the output current is brought back into its specified range.
Output Ripple Reduction
A good quality low ESR capacitor placed as close as possible across the load will give the best ripple and noise performance.
To reduce output ripple, it is recommended to use 3.3µF capacitors at the output.
12/17/2013
Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-7789797
website: www.wallindustries.com • e-mail: sales@wallindustries.com
Page 4 of 5
Rev A
DCMSW1 SERIES
1 Watt DC/DC Power Converters
Input Source Impedance
The power module should be connected to a low ac-impedance input source. Highly inductive source impedances can affect
the stability of the power module. In applications where power is supplied over long lines and output loading is high, it may be
necessary to use a capacitor at the input to ensure startup. Capacitor mounted close to the power module helps ensure
stability of the unit, it is recommended to use a good quality low Equivalent Series Resistance (ESR < 1.0Ω at 100 KHz)
capacitor of 8.2µF for 5VDC input models, 3.3µF for 12VDC input models, and 1.5µF for 24VDC and 48VDC input models.
DESIGN & FEATURE CONSIDERATIONS
Thermal Considerations
Many conditions affect the thermal performance of the power module, such as orientation, airflow over the module, and board
spacing. To avoid exceeding the maximum temperature rating of the components inside the power module, the case
temperature must be kept below 95°C. The derating curves are determined from measurements obtained in a test setup.
COMPANY INFORMATION
Wall Industries, Inc. has created custom and modified units for over 50 years. Our in-house research and development
engineers will provide a solution that exceeds your performance requirements on-time and on budget. Our ISO9001-2008
certification is just one example of our commitment to producing a high quality, well-documented product for our customers.
Our past projects demonstrate our commitment to you, our customer. Wall Industries, Inc. has a reputation for working closely
with its customers to ensure each solution meets or exceeds form, fit and function requirements. We will continue to provide
ongoing support for your project above and beyond the design and production phases. Give us a call today to discuss your
future projects.
Contact Wall Industries for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
12/17/2013
(603)778-2300
(888)597-9255
(603)778-9797
sales@wallindustries.com
www.wallindustries.com
37 Industrial Drive
Exeter, NH 03833
Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-7789797
website: www.wallindustries.com • e-mail: sales@wallindustries.com
Page 5 of 5