BWR Models
www.murata-ps.com
Miniature 5 Watt DC-DC Converters
Typical units
FEATURES
PRODUCT OVERVIEW
Small size, 1" x 1" x 0.45"
The migration to distributed power is accelerating.
The critical need for accurate voltages, tight regulation and rapid transient response is propelling
the move to power processing at the "point-ofuse" with low-power DC-DC converters physically
located right at their loads.
Full 5 Watts output power
No external components required
Drop-in replacements for many standard,
2" x 1" DC-DCs
Wide input voltage ranges:
18-36V or 36-72V
Standard output voltages:
±5, ±12, ±15 Volts
Guaranteed efficiencies to 80%
MPS’s miniature, full featured, 5 Watt BWR Models
were specifically designed for today’s demanding distributed power architectures in aerospace,
marine, telecom and computer applications. The
converters’ small size (1" x 1" x 0.45"),
full 5 Watt output capability and low cost give
system architects unprecedented design and
layout flexibility.
Fully regulated and isolated
(1000Vdc guaranteed)
Output overvoltage protection and
current limiting
–25 to +95oC operating temperature
Occupying less than 0.5in3 total volume, these
extremely compact, fully regulated and isolated
(1000Vdc) modules are available with ±5, ±12 or
±15 Volt outputs. Input voltage ranges are either
18-36 Volts ("D24" models) or 36-72 Volts ("D48"
models).
Shielded cases (5 sides)
UL1950, CSA 22.2 No. 234, and IEC950
Modifications and customs for OEMs
+VIN
(1)
Although their overall size is 50-75% smaller than
many similarly rated power modules, these 1"
x 1" BWR Models are exact, drop-in, pin-for-pin
replacements for many standard 2" x 1" and 2"
x 2", 5 Watt modules. They achieve their small
size and low cost by exploiting a novel feedback
approach that does not depend upon traditional
optocoupler techniques.
All models are 5-side shielded and have a nonconductive baseplate that permits pc-card runs
to be placed beneath the package. Units are
assembled using
high-speed automated SMT techniques and are
fully encapsulated with thermally
conductive potting compound. Every unit is electrically tested before and after
encapsulation, 100% burned-in under full load,
hi-pot tested, and final-electrical tested prior to
shipment. Every unit meets MPS’s traditional high
standards for quality and long-term reliability.
*
+VOUT
(3)
PWM
COMMON
(4)
–VOUT
(6)
–VIN
(2)
* "D24" models only
For full details go to
www.murata-ps.com/rohs
Figure 1. Simplified Schematic
Typical topology is shown.
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MDC_BWR_5W.D01 Page 1 of 5
BWR Models
Miniature 5 Watt DC-DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
Regulation (Max.)
Efficiency
Full Load
Package
(Case/
Pinout)
Load
VIN Nom.
(Volts)
Range
(Volts)
IIN
(mA)
Min.
Typ.
±2%
24
18-36
25/282
75%
78%
C7, P4
±2%
±2%
48
36-72
25/141
75%
78%
C7, P4
150
±2%
±2%
24
18-36
25/264
80%
82%
C7, P4
100
150
±2%
±2%
48
36-72
25/133
80%
82%
C7, P4
100
150
±2%
±2%
24
18-36
25/260
80%
83%
C7, P4
100
150
±2%
±2%
48
36-72
25/130
80%
82%
C7, P4
VOUT
(Volts)
IOUT
(mA, Max.)
Typ.
Max.
Line
BWR-5/500-D24-C
±5
±500
100
150
±2%
BWR-5/500-D48-C
±5
±500
100
120
BWR-12/210-D24-C
±12
±210
100
BWR-12/210-D48-C
±12
±210
BWR-15/165-D24-C
±15
±165
BWR-15/165-D48-C
±15
±165
Model
➀
➁
➂
➃
➄
Input
R/N (mVp-p)
Typical at TA = +25°C under nominal line voltage and full-load conditions unless otherwise noted.
Ripple/Noise (R/N) measured over a 20MHz bandwidth.
Balanced loads, 20% to 100% load.
Nominal line voltage, no-load/full-load conditions.
See part number structure below.
MECHANICAL SPECIFICATIONS
PART NUMBER STRUCTURE
B WR - 15 / 165 - D24 - C
Case C7
1.00
(25.40)
Output Configuration:
B = Bipolar
RoHS-6 Compliance*
METAL CASE
0.45
(11.43)
Input Voltage Range:
D24 = 18-36 Volts (24V nominal)
D48 = 36-72 Volts (48V nominal)
Wide Range Input
Nominal Output Voltages:
Maximum Output Current
±5, ±12 or ±15 Volts
in mA from each output
INSULATED BASE
0.040 ±0.002 DIA.
(1.016 ±0.051)
0.20 MIN
(5.08)
0.800
(20.32)
0.100
(2.54)
Contact Murata Power Solutions for availability.
0.10
(2.54)
3
0.400
(10.16)
1
0.800
1.00
(20.32) (25.40)
4
2
5
TEMPERATURE DERATING
0.200
(5.08)
6
BOTTOM VIEW
0.200
(5.08)
5
0.10
(2.54)
DIMENSIONS ARE IN INCHES (MM)
4.5
Output Power (Watts)
4
3.5
3
I/O Connections
Pin Function P4
1
+Input
2
–Input
3
+Output
4
Common
5
No Pin
6
–Output
2.5
2
1.5
1
0.5
Notes:
For "D24" models, the case
is connected to pin 2 (–VIN).
For "D48" models, the case
is connected to pin 1 (+VIN).
0
–25
0
35
40
45
50
55
60
65
70
75
80
85
90
95
Ambient Temperature (°C)
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MDC_BWR_5W.D01 Page 2 of 5
BWR Models
Miniature 5 Watt DC-DC Converters
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted. ➀
Absolute Maximum Ratings
Input
Input Voltage Range:
"D24" Models
"D48" Models
18-36 Volts (24V nominal)
36-72 Volts (48V nominal)
Input Current
See Ordering Guide
Input Filter Type ➁
LC on "D24" models
C on "D48" models
Reverse-Polarity Protection
Yes (Instantaneous, 6A maximum)
Output
VOUT Accuracy (50% load):
±5V Outputs
±12/±15V Outputs
±1.5%, maximum
±1%, maximum
Temperature Coefficient
±0.02% per °C
Ripple/Noise (20MHz BW) ➁
Input Voltage:
"D24" Models
"D48" Models
Input Reverse-Polarity Protection
Output Overvoltage Protection
±5V Outputs
±12V Outputs
±15V Outputs
44 Volts
88 Volts
Current must be <6A. Brief
duration only. Fusing recommended.
6.8 Volts, limited duration
15 Volts, limited duration
18 Volts, limited duration
Output Current
Current limited. Max. current and
short-circuit duration are model
dependent.
See Ordering Guide
Storage Temperature
–55 to +125°C
Line Regulation
See Ordering Guide
Lead Temperature (soldering, 10 sec.)
+300°C
Load Regulation
See Ordering Guide
Efficiency
See Ordering Guide
Isolation Voltage ➂
1000Vdc, minimum
Current Limiting
Auto-recovery
Overvoltage Protection
Zener/transorb clamps
Dynamic Characteristics
Technical Notes
Transient Response (50% load step)
500µsec max. to ±1.5% of final value
Switching Frequency
170kHz (±10kHz)
Environmental
Operating Temperature (ambient): ➃
Without Derating
With Derating
–25 to +60°C
to +95°C (See Derating Curve)
Storage Temperature
–55 to +125°C
Physical
Dimensions
1" x 1" x 0.45" (25.4 x 25.4 x 11.4mm)
Shielding
5-sided
Case Connection:
"D24" Models
"D48" Models
Pin 2 (–VIN)
Pin 1 (+VIN)
Case Material
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifications Table is not implied.
Corrosion resistant steel with
epoxy-based enamel finish
Pin Material
Gold-plated copper alloy
Weight
0.7 ounces (20 grams)
Flammability
UL 94-0
➀ These power converters require a minimum 20% loading to maintain specified regulation.
Operation under no-load conditions will not damage these devices, however they may not
meet all listed specifications.
➁ Application-specific internal input/output filtering can be recommended and perhaps
added
internally on request. Contact MPS Applications Engineering for details.
➂ Units can be screened or modified for higher guaranteed isolation voltages.
Contact MPS Applications Engineering for details.
➃ Units can be screened for lower-temperature operation.
Contact MPS Applications Engineering for details.
Floating Outputs
Since these are isolated DC-DC converters, their outputs are "floating." Any
BWR model may be configured to produce an output of 10V, 24V or 30V
(for ±5V, ±12V or ±15V models, respectively) by applying the load across
the +Output and –Output (pins 3 and 6), with either output grounded. The
Common (pin 4) should be left open. Minimum 20% loading is recommended under these conditions.
Filtering and Noise Reduction
All BWR 5 Watt DC-DC Converters achieve their rated ripple and noise
specifications without the use of external input/output capacitors. In critical
applications, input/output ripple and noise may be further reduced by installing low-ESR, tantalum or electrolytic capacitors across the input
and/or output terminals. Output capacitors should be connected between
their respective output pin (pin 3 or 6) and Common (pin 4) as shown in
Figure 2. The capacitors should be located as close to the power converters as possible. Typical values are listed below. In many applications, using
values greater than those listed will yield better results.
To Reduce Input Ripple
"D24" Models
"D48" Models
20µF, 50V
10µF, 100V
To Reduce Output Ripple
±5V Outputs
±12/15V Outputs
47µF, 10V, Low ESR
33µF, 20V, Low ESR
In critical, space-sensitive applications, MPS may be able to tailor the internal input/output filtering of these units to meet your specific requirements.
Contact our Applications Engineering Group for additional details.
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MDC_BWR_5W.D01 Page 3 of 5
BWR Models
Miniature 5 Watt DC-DC Converters
Typical Performance Curves (TA = +25°C)
The performance curves below were derived from actual test data for a single model number (BWR-15/165-D24).
Since all devices in this series have the same circuit topology, the performance curves are representative of all devices.
E F F I C I E N C Y V S . I N P U T VO LTAG E A N D O U T P U T L OA D
L OA D R E G U L AT I O N
L I N E R E G U L AT I O N
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MDC_BWR_5W.D01 Page 4 of 5
BWR Models
Miniature 5 Watt DC-DC Converters
E M I R A D I AT E D E M I S S I O N S
+OUTPUT
3
+
1
+INPUT
COUT
4
+
COMMON
CIN
2
+
–INPUT
COUT
6
–OUTPUT
If you’re designing with EMC in mind, all MPS’s BWR 5 Watt DC-DC's have
been characterized for radiated/conducted emissions in our new EMI/EMC
lab. Testing is conducted in an EMCO 5305 GTEM test cell utilizing EMCO
automated EMC test software. Radiated emissions are tested to the limits
of FCC Part 15, Class B and CISPR 22 (EN 55022) Class B. Correlation to
other specifications can be supplied upon request. Radiated emissions plots
to FCC and CISPR 22 appear below. Its performance is typical of all models
in the Family. Published EMC test reports are available for each model
number. Contact MPS’s Applications Engineering Department for details.
Radiated Emissions
FCC Part 15 Class B, 3 Meters
Converter Output = ±15Vdc @ ±132mA
Figure 2. Using External Capacitors to Reduce
Input/Output Ripple/Noise
80
70
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. For MPS BWR
5 Watt DC-DC Converters, you should use slow-blow type fuses with values
no greater than 0.5A.
Radiated Emissions (dBµV/M)
60
FCC Class B Limit
50
40
30
20
10
0
Radiated Emissions
–10
–20
C U S T O M
1000
100
C A P A B I L I T I E S
Frequency (MHz)
Radiated Emissions
EN 55022 Class B, 10 Meters
Converter Output = ±15Vdc @ ±132mA
MPS’s world-class design, development and manufacturing team stands
ready to work with you to deliver the exact power converter you need for
your demanding, large volume, OEM applications. And . . . we’ll do it on time
and within budget!
80
70
We have compiled a large library of DC-DC designs that are currently used
in a variety of telecom, medical, computer, railway, aerospace and industrial
applications. We may already have the converter you need.
60
Radiated Emissions (dBµV/M)
Our experienced applications and design staffs; quick-turn prototype
capability; highly automated, SMT assembly facilities; and in-line SPC
quality-control techniques combine to give us the unique ability to design
and deliver any quantity of power converters to the highest standards of
quality and reliability.
50
EN 55022 Class B Limit
40
30
20
10
0
Contact us. Our goal is to provide you the highest-quality, most cost-effective
power converters available.
Radiated Emissions
–10
–20
1000
100
Frequency (MHz)
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2014 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_BWR_5W.D01 Page 5 of 5