BWR Models
MINIATURE, 5 WATT DC/DC CONVERTERS
Features
Small size, 1" x 1" x 0.45"
Full 5 Watts output power
No external components required
Drop-in replacements for many
standard, 2" x 1" DC/DC’s
Wide input voltage ranges:
18-36V or 36-72V
Standard output voltages:
±5, ±12, ±15 Volts
Guaranteed efficiencies to 80%
Fully regulated and isolated
(1000Vdc guaranteed)
Output overvoltage protection and
current limiting
–25 to +95
o
C operating temperature
Shielded cases (5 sides)
UL1950, CSA 22.2 No. 234, and IEC950
Modifications and customs for OEM's
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-of-use" with low-power DC/DC converters physically
located right at their loads.
MPS’s miniature, full featured, 5 Watt BWR Models were specifically designed
for today’s demanding distributed power architectures in aerospace, marine, tele-
com 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.
Occupying less than 0.5in
3
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).
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 non-conductive 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 qual-
ity and long-term reliability.
+V
IN
(1)
*
PWM
+V
OUT
(3)
COMMON
(4)
–V
OUT
(6)
–V
IN
(2)
For full details go to
www.murata-ps.com/rohs
Figure 1. Simplified Schematic
* "D24" models only
Typical topology is shown.
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MDC_BWR_5W_B01
Page 1 of 5
BWR Models
MINIATURE, 5 WATT DC/DC CONVERTERS
Performance Specifications and Ordering Guide
Output
Model
BWR-5/500-D24
BWR-5/500-D48
BWR-12/210-D24
BWR-12/210-D48
BWR-15/165-D24
BWR-15/165-D48
Input
Regulation (Max.)
Line
±2%
±2%
±2%
±2%
±2%
±2%
V
OUT
(Volts)
±5
±5
±12
±12
±15
±15
I
OUT
(mA, Max.)
±500
±500
±210
±210
±165
±165
R/N (mVp-p)
Typ.
Max.
100
100
100
100
100
100
150
120
150
150
150
150
Load
±2%
±2%
±2%
±2%
±2%
±2%
V
IN
Nom.
(Volts)
24
48
24
48
24
48
Range
(Volts)
18-36
36-72
18-36
36-72
18-36
36-72
I
IN
(mA, Max.)
25/282
25/141
25/264
25/133
25/260
25/130
Efficiency
Min.
75%
75%
80%
80%
80%
80%
Typ.
78%
78%
82%
82%
83%
82%
Package
(Case,
Pinout)
C7, P4
C7, P4
C7, P4
C7, P4
C7, P4
C7, P4
Typical at T
A
= +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.
P A R T
N U M B E R
S T R U C T U R E
M E C H A N I C A L
S P E C I F I C A T I O N S
B WR
-
15
/
165
-
D24
-
C
Output Configuration:
B
= Bipolar
Wide Range Input
Nominal Output Voltages:
±5, ±12 or ±15 Volts
RoHS-6 Compliance*
0.45
(11.43)
Case C7
1.00
(25.40)
METAL CASE
Input Voltage Range:
D24
= 18-36 Volts (24V nominal)
D48
= 36-72 Volts (48V nominal)
Maximum Output Current
in mA from each output
0.20 MIN
(5.08)
0.800
(20.32)
INSULATED BASE
0.040 ±0.002 DIA.
(1.016 ±0.051)
0.10
(2.54)
Contact Murata Power Solutions for availability.
0.100
(2.54)
1
3
0.400
(10.16)
4
2
5
0.800
1.00
(20.32) (25.40)
TEMPERATURE DERATING
5
4.5
4
0.200
(5.08)
6
BOTTOM VIEW
0.200
(5.08)
0.10
(2.54)
DIMENSIONS ARE IN INCHES (MM)
Output Power (Watts)
3.5
3
2.5
2
1.5
1
0.5
0
–25
0
35
40
45
50
55
60
65
70
75
80
85
90
95
I/O Connections
Pin Function P4
1
+Input
2
–Input
3
+Output
4
Common
5
No Pin
6
–Output
Notes:
For "D24" models, the case
is connected to pin 2 (–V
IN
).
For "D48" models, the case
is connected to pin 1 (+V
IN
).
Ambient Temperature (°C)
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+1 508 339 3000
MDC_BWR_5W_B01
Page 2 of 5
BWR Models
MINIATURE, 5 WATT DC/DC CONVERTERS
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions, unless noted.
Input
Input Voltage Range:
"D24" Models
"D48" Models
Input Current
Input Filter Type
Reverse-Polarity Protection
V
OUT
Accuracy
(50% load):
±5V Outputs
±12/±15V Outputs
Temperature Coefficient
Ripple/Noise
(20MHz BW)
Line Regulation
Load Regulation
Efficiency
Isolation Voltage
Current Limiting
Overvoltage Protection
Transient Response (50% load step)
Switching Frequency
Operating Temperature
(ambient):
Without Derating
With Derating
Storage Temperature
Dimensions
Shielding
Case Connection:
"D24" Models
"D48" Models
Case Material
Pin Material
Weight
Flammability
18-36 Volts (24V nominal)
36-72 Volts (48V nominal)
See Ordering Guide
LC on "D24" models
C on "D48" models
Yes (Instantaneous, 6A maximum)
Input Voltage:
"D24" Models
"D48" Models
Absolute Maximum Ratings
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
Current limited. Max. current and
short-circuit duration are model
dependent.
–55 to +125°C
+300°C
Input Reverse-Polarity Protection
Output Overvoltage Protection
±5V Outputs
±12V Outputs
±15V Outputs
Output Current
Output
±1.5%, maximum
±1%, maximum
±0.02% per °C
See Ordering Guide
See Ordering Guide
See Ordering Guide
See Ordering Guide
1000Vdc, minimum
Auto-recovery
Zener/transorb clamps
Storage Temperature
Lead Temperature
(soldering, 10 sec.)
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.
TECHNICAL NOTES
Dynamic Characteristics
500μsec max. to ±1.5% of final value
170kHz (±10kHz)
Environmental
–25 to +60°C
to +95°C (See Derating Curve)
–55 to +125°C
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 install-
ing 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
To Reduce Output Ripple
±5V Outputs
±12/15V Outputs
20μF, 50V
10μF, 100V
47μF, 10V, Low ESR
33μF, 20V, Low ESR
Physical
1" x 1" x 0.45" (25.4 x 25.4 x 11.4mm)
5-sided
Pin 2 (–V
IN
)
Pin 1 (+V
IN
)
Corrosion resistant steel with
epoxy-based enamel finish
Gold-plated copper alloy
0.7 ounces (20 grams)
UL 94-0
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.
Application-specific internal input/output filtering can be recommended and perhaps added
internally on request. Contact MPS Applications Engineering for details.
Units can be screened or modified for higher guaranteed isolation voltages.
Contact MPS Applications Engineering for details.
Units can be screened for lower-temperature operation.
Contact MPS Applications Engineering for details.
In critical, space-sensitive applications, MPS may be able to tailor the inter-
nal input/output filtering of these units to meet your specific requirements.
Contact our Applications Engineering Group for additional details.
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_BWR_5W_B01
Page 3 of 5
BWR Models
MINIATURE, 5 WATT DC/DC CONVERTERS
Typical Performance Curves
(T
A
= +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 V O LTA G E A N D O U T P U T L O A D
LO A 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_B01
Page 4 of 5
BWR Models
MINIATURE, 5 WATT DC/DC CONVERTERS
E M I RA D I AT E D E M I S S I O N S
+OUTPUT
1
+INPUT
+
C
IN
2
–INPUT
COMMON
3
+
C
OUT
4
+
C
OUT
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
60
Radiated Emissions (dBμV/M)
FCC Class B Limit
50
40
30
20
10
0
Radiated Emissions
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.
–10
–20
C U S T O M
C A P A B I L I T I E S
100
1000
Frequency (MHz)
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!
Our experienced applications and design staffs; quick-turn prototype capa-
bility; 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.
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.
Contact us. Our goal is to provide you the highest-quality, most cost-effective
power converters available.
Radiated Emissions
EN 55022 Class B, 10 Meters
Converter Output = ±15Vdc @ ±132mA
80
70
60
Radiated Emissions (dBμV/M)
50
EN 55022 Class B Limit
40
30
20
10
0
Radiated Emissions
–10
–20
100
1000
Frequency (MHz)
USA:
UK:
France:
Japan:
Tucson (Az), Tel: (800) 547 2537, email: sales@murata-ps.com
Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com
Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com
Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com
Website: www.murata-ps.jp
Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
Canada:
Toronto, Tel: (866) 740 1232, email: toronto@murata-ps.com
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com
ISO 9001 REGISTERED
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.
© 2008 Murata Power Solutions, Inc.
Germany:
München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com
China:
DS-0318
02/11/08
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_BWR_5W_B01
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