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BWR Series
15-17W, Dual Output DC/DC Converters
Typical units
FEATURES
Output voltages: ±5, ±12 or ±15 Volts
voltage ranges:
Input
10-18V, 18-36V or 36-75V
Small packages, 1" x 2" x 0.48"
Industry-standard pinouts
cost; Highly reliable
Low
Proven SMT-on-pcb construction
Designed to meet IEC/EN/UL60950-1
safety
mark available (75V-input models)
1500Vdc isolation; 100% tested
ciencies to 86%
Effi
to +100°C operating temperature
–40
Thermal protection
On/Off control
PRODUCT OVERVIEW
For your mid-range power requirements, it’s hard to beat the combination of small packaging,
low cost, proven reliability and outstanding electrical performance
offered by the 15-17W, dual-output models of MPS’s A-Series DC/DC converters. These highly effi-
cient, rugged converters combine straightforward circuit topologies, the newest components, proven
SMT-on-pcb construction methods, and highly repeatable automatic-assembly techniques. Their
superior durability is substantiated by a rigorous in-house qualification program.
The input voltage ranges of the BWR 15-17 Bipolar Series (10-18V for "D12A" models, 18-36V
for "D24A" models and 36-75V for "D48A" models) make them excellent candidates for telecom-
munication system line drivers, or distributed power architectures. Their ±5, ±12 or ±15 Volt outputs
cover virtually all standard applications.
These popular power converters are fully isolated (1500Vdc 100% tested) and display excellent
line and load regulation (±0.5% max. for line and load). They are completely I/O protected (input
overvoltage shutdown and reverse-polarity protection, output current limiting and overvoltage pro-
tection) and contain input (pi type) and output filtering to reduce noise.
These extremely reliable, cost-effective power converters are housed in standard 1" x 2" x
0.48" UL94V-0 rated plastic packages. They offer industry-standard pinouts and are ideally suited
for high-volume computer, telecom/datacom, instrumentation and ATE applications.
+INPUT
(1)
+OUTPUT
(4)
COMMON
(5)
–INPUT
(2)
ON/OFF
CONTROL
(OPTION)
(3)
–OUTPUT
(6)
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
Figure 1. Simplified Schematic
Typical topology is shown
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MDC_BWR15-17W.B11
Page 1 of 9
BWR Series
15-17W, Dual Output DC/DC Converters
Performance Specifications and Ordering Guide
Output
Root Model
➄
BWR-5/1500-D12A
BWR-5/1500-D24A
BWR-5/1500-D48A
BWR-12/725-D12A
BWR-12/725-D24A
BWR-12/725-D48A
BWR-15/575-D12A
BWR-15/575-D24A
BWR-15/575-D48A
➀
➁
➂
➃
➄
➀
Input
Regulation (Max.)
Line
Load
➂
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
V
OUT
(Volts)
±5
±5
±5
±12
±12
±12
±15
±15
±15
I
OUT
(mA)
±1500
±1500
±1500
±725
±725
±725
±575
±575
±575
R/N (mVp-p)
➁
Typ.
Max.
75
75
75
75
75
75
75
75
75
100
100
100
100
100
100
100
100
100
V
IN
Nom.
(Volts)
12
24
48
12
24
48
12
24
48
Range
(Volts)
10-18
18-36
36-75
10-18
18-36
36-75
10-18
18-36
36-75
I
IN
➃
(mA/A)
240/1.5
112/0.75
59/0.38
265/1.7
127/0.85
62/0.4
266/1.7
125/0.84
65/0.41
Efficiency
Min.
Typ.
79%
81%
81%
82%
83%
84%
82%
84%
85%
81%
83%
83%
83.5%
85%
86%
84%
86%
87%
Package
(Case,
Pinout)
C14A, P43
C14A, P43
C14A, P43
C14A, P43
C14A, P43
C14A, P43
C14A, P43
C14A, P43
C14A, P43
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, 10% to 100% load step.
Nominal line voltage, 10% load/100% load conditions.
These are not complete model numbers. Please use the part number structure when ordering.
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
-
12
/
725
-
D48 A C
-
C
Output Configuration:
B
= Bipolar
Wide Range Input
Nominal Output Voltages:
±5, ±12 or ±15 Volts
Maximum Output Current
in mA from each output
RoHS-6 Hazardous
Substance Compliant*
Add C or N suffix as
desired. See below.
A-Series
High Reliability
Input Voltage Range:
D12
= 10-18 Volts (12V nominal)
D24
= 18-36 Volts (24V nominal)
D48
= 36-75 Volts (48V nominal)
0.465
(11.81)
2.00
(50.80)
PLASTIC CASE
Case C14A
STANDOFF
0.015 (0.38)
0.20 MIN
(5.08)
0.040 ±0.002 DIA.
(1.016 ±0.051)
0.800
(20.32)
0.60
(15.24)
4
1
1.00
(25.40)
0.100
(2.54)
0.800
(20.32)
0.400
(10.16)
5
2
3
BOTTOM VIEW
DIMENSION ARE IN INCHES (MM)
0.10
(2.54)
6
Part Number Suffixes
BWR 15-17 Watt DC/DC's are designed so an On/Off Control function
with either positive polarity ("C" suffix) or negative polarity ("N" suffix)
can be added to the pin 3 position. Models ordered without On/Off
control (without C or N suffix) will not have pin 3 installed.
No Suffix
Pin 3 not installed
C
N
Positive On/Off control function (pin 3)
Negative On/Off control function (pin 3)
0.200
(5.08)
I/O Connections
Pin Function P43
1
+Input
2
–Input
3 On/Off Control*
4
+Output
5
Output Return
6
–Output
* Pin is optional
Dimensions are in inches (mm) shown for ref. only.
Third Angle Projection
* Contact Murata Power Solutions for availability.
Some model number combinations may not be available. Please contact Murata
Power Solutions for more information.
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
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MDC_BWR15-17W.B11
Page 2 of 9
BWR Series
15-17W, Dual Output DC/DC Converters
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions, unless noted.
➀
Dynamic Characteristics
Transient Response:
(50-100% load step to 2% V
OUT
)
Start-Up Time:
V
IN
to V
OUT
On/Off to V
OUT
Switching Frequency
MTBF
250µsec maximum
35msec
30msec
300kHz (±30kHz)
Input
Input Voltage Range:
D12A Models
D24A Models
D48A Models
Overvoltage Shutdown:
D12A Models
D24A Models
D48A Models
Start-Up Threshold:
➂
D12A Models
D24A Models
D48A Models
Undervoltage Shutdown:
➂
D12A Models
D24A Models
D48A Models
Input Current
Normal Operating Conditions
Standby Mode (Off, OV, UV)
Input Reflected Ripple Current
➅
Input Filter Type
Reverse-Polarity Protection
On/Off Control:
➃ ➄
C Models
N Models
10-18 Volts (12V nominal)
18-36 Volts (24V nominal)
36-75 Volts (48V nominal)
19-21 Volts
37-40 Volts
77-81 Volts
9.4-10 Volts
16.5-18 Volts
34-36 Volts
7-8.5 Volts
15.5-17.5 Volts
32.5-34.5 Volts
See Ordering Guide
5mA
10 mAp-p
Pi
Brief duration, 5A maximum.
On = open or 13V- +V
IN
, I
IN
= 1mA max.
Off = 0-0.8V, I
IN
= 1mA max.
On = 0-0.5V, I
IN
= 3mA max.
Off = open or 3.5- +V
IN
, I
IN
= 1mA max.
Environmental
Bellcore, ground fixed, fullpower
25°C ambient, 1 million hours
Operating Temperature
(ambient):
-40 to +85°C with derated power (see derating curves)
Thermal Shutdown
Storage Temperature
Flammability
Dimensions
Case Material
Pin Material
Weight
115°C
–40 to +120°C
UL 94V-0
Physical
1" x 2" x 0.48" (25.4 x 50.8 x 12.19mm)
Diallyl Phthalate
Gold-plate over copper alloy
1.19 ounces (34 grams)
Primary to Secondary Insulation Level
Functional
➀
All models are specified with no external I/O capacitors.
➁
See Technical Notes/Graphs for details.
➂
Applying a voltage to the On/Off Control (pin 3) when no input power is applied to the
converter can cause permanent damage to the converter.
➃
Output noise may be further reduced with the addition of additional external output capacitors.
See Technical Notes.
➄
The On/Off Control is designed to be driven with open-coolector logic or the application of
appropriate voltage levels. Voltages may be referenced to the –Input (pin 2).
➅
Input Ripple Current is tested/specified over a 5-20MHz bandwidth with an external 33µF
input capacitor and a simulated source impedance of 220µF and 12µH. See I/O Filtering, Input
Ripple Current and Output Noise for details.
Output
V
OUT
Accuracy
(balanced half load)
Minimum Load Requirement
➁
Ripple/Noise
(20MHz BW)
➀ ➅
Line/Load Regulation
Efficiency
Isolation Voltage
Isolation Capacitance
Isolation Resistance
Current Limit Inception
(@ 98% V
OUT
)
±5V Models
±12V Models
±15V Models
Short-Circuit Current
±5V Models
±12V Models
±15V Models
Overvoltage protection
±5V Models
±12V Models
±15V Models
Maximum Capacitive Loading
Temperature Coefficient
±2.0%, maximum
10%
See Ordering Guide
See Ordering Guide
See Ordering Guide
1500Vdc, minimum
550pF
10MΩ
1.9-2.5A
1-1.5A
0.85-1.2A
800mA maximum
700mA maximum
700mA maximum
Output voltage comparator
5.45-7.15 Volts
13-15.8 Volts
16.2-19.8 Volts
1000µF (per output)
±0.02% per °C
Absolute Maximum Ratings
Input Voltage:
Continuous:
D12A Models
D24A Models
D48A Models
Transient (100msec):
D12A Models
D24A Models
D48A Models
On/Off Control (pin 3) Max. Voltages
Referenced to –Input (pin 2)
"C" Suffix
"N" Suffix
Input Reverse-Polarity Protection
Output Current
23 Volts
42 Volts
81 Volts
50 Volts
50 Volts
100 Volts
+V
IN
(+18 Volts)
+7 Volts
Current must be <5 Amps. Brief
duration only. Fusing recommended.
Current limited. Devices can withstand
sustained output short circuits without
damage.
120°C
–40 to +120°C
See soldering guidelines
Case Temperature
Storage Temperature
Lead Temperature
These are stress ratings. Exposure of devices to greater than 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.
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MDC_BWR15-17W.B11
Page 3 of 9
BWR Series
15-17W, Dual Output DC/DC Converters
T E C H N I C A L
N O T E S
Input Fusing
Certain applications and/or safety agencies may require the installation of fuses
at the inputs of power conversion components. Fuses should also be used if
the possibility of sustained, non-current-limited, input-voltage polarity reversal
exists. For MPS BWR 15-17 Watt DC/DC Converters, you should use slow-blow
type fuses with values no greater than the following:
Model
All D12A Models
BWR-5/1500-D24A
BWR-12/725-D24A, BWR-15/575-D24A
All D48A Models
Start-Up Time
The V
IN
to V
OUT
start-up time is the interval of time where the input voltage
crosses the turn-on threshold point, and the fully loaded output voltage enters
and remains within its specified accuracy band. Actual measured times will vary
with external output capacitance and load. The BWR 15-17W Series implements
a soft start circuit that limits the duty cycle of the PWM controller at power up,
thereby limiting the Input Inrush current.
The On/Off Control to V
OUT
start-up time assumes the converter has its nominal
input voltage applied but is turned off via the On/Off Control pin. The specification
defines the interval between the time at which the converter is turned on and the
fully loaded output voltage enters and remains within its specified accuracy band.
Similar to the V
IN
to V
OUT
start-up, the On/Off Control to V
OUT
start-up time is also
governed by the internal soft start circuitry and external load capacitance.
Input Overvoltage/Undervoltage Shutdown and Start-Up Threshold
Under normal start-up conditions, devices will not begin to regulate until the ramping-up
input voltage exceeds the Start-Up Threshold Voltage (35V for D48 models). Once
operating, devices will not turn off until the input voltage drops below the Undervoltage
Shutdown limit (33.5V for D48 models). Subsequent re-start will not occur until the input is
brought back up to the Start-Up Threshold. This built in hysteresis prevents any unstable
on/off situations from occurring at a single input voltage.
Input voltages exceeding the input overvoltage shutdown specification listed in
the Performance/Functional Specifications will cause the device to shutdown. A
built-in hysteresis of 0.6 to 1.6 Volts for all models will not allow the converter to
restart until the input voltage is sufficiently reduced.
Input Source Impedance
The converters must be driven from a low ac-impedance input source. The DC/
DC's performance and stability can be compromised by the use of highly induc-
tive source impedances. The input circuit shown in Figure 2 is a practical solu-
tion that can be used to minimize the effects of inductance in the input traces.
For optimum performance, components should be mounted close to the DC/DC
converter. If the application has a high source impedance, low V
IN
models can
benefit of increased external input capacitance.
I/O Filtering, Input Ripple Current, and Noise Reduction
All BWR 15-17W 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
additional external I/O caps.
Fuse Value
4 Amp
2 Amp
2.5 Amp
1 Amp
External input capacitors (C
IN
in Figure 2) serve primarily as energy-storage
elements, minimizing line voltage variations caused by transient IR drops in
conductors from backplane to the DC/DC. Input caps should be selected for
bulk capacitance (at appropriate frequencies), low ESR, and high rms-ripple-
current ratings. The switching nature of DC/DC converters requires that dc
voltage sources have low ac impedance as highly inductive source imped-
ance can affect system stability. In Figure 2, C
BUS
and L
BUS
simulate a typical
dc voltage bus. Your specific system configuration may necessitate additional
considerations.
TO
OSCILLOSCOPE
CURRENT
PROBE
+INPUT
L
BUS
+
V
IN
–
C
BUS
C
IN
–INPUT
C
IN
= 33µF, ESR < 700m @ 100kHz
C
BUS
= 220µF, ESR < 100m @ 100kHz
L
BUS
= 12µH
Figure 2. Measuring Input Ripple Current
In critical applications, output ripple/noise (also referred to as periodic and
random deviations or PARD) may be reduced below specified limits using filter-
ing techniques, the simplest of which is the installation of additional external
output capacitors. These output caps function as true filter elements and
should be selected for bulk capacitance, low ESR and appropriate frequency
response. All external capacitors should have appropriate voltage ratings and
be located as close to the converter as possible. Temperature variations for all
relevant parameters should also be taken carefully into consideration. The most
effective combination of external I/O capacitors will be a function of line voltage
and source impedance, as well as particular load and layout conditions.
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "floating," with
respect to the input. As such, it is possible to use +Output, –Output or Output
Return as the system ground thereby allowing the flexibility to generate a
variety of output voltage combinations.
Regulation for BWR 15-17W bipolar converters is monitored between
–Output and +Output (as opposed to Output to Return).
Minimum Loading Requirements
BWR 15-17W converters employ a classical diode-rectification design topology
and require a minimum 10% loading to achieve their listed regulation specifica-
tions and a stable operating condition.
Load Regulation
Regulation for the BWR 15-17W bipolar converters is monitored between
–Output and +Output (as opposed to Output to Return). As such regulation will
assure that voltage between –Output and +Output pins remains within the V
OUT
accuracy listed in the Performance/Functional Specifications table.
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MDC_BWR15-17W.B11
Page 4 of 9
BWR Series
15-17W, Dual Output DC/DC Converters
If loading from +/– Outputs to Output Return is symmetrical, the voltage at
Output pins with respect to Output Return will also be symmetrical. An unbal-
ance in loading will consequently result in a degraded V
OUT
regulation accuracy
from +/– Outputs to Output Return ( –Output to +Output regulation will still be
within specification) with a load step from minimum to maximum load and with
the other output at full load, the maximum deviation is 2.5% V
OUT
nominal.
BWR-15/575-D48A Unbalanced Output Load Regulation
15.5
15.4
15.3
15.2
+/–15V
OUT
15.1
15
14.9
14.8
14.7
–15V @ 0A to 0.575A
+15V @ 0.575A
+15V @ 0A to 0.575A
–15V @ 0.575A
Start-Up Time
The V
IN
to V
OUT
start-up time is the interval of time where the input voltage crosses
the turn-on threshold point, and the fully loaded output voltage enters and remains
within its specified accuracy band. Actual measured times will vary with external
output capacitance and load. The BWR 15-17W Series implements a soft start
circuit that limits the duty cycle of the PWM controller at power up, thereby limiting
the Input Inrush current.
The On/Off Control to V
OUT
start-up time assumes the converter has its nominal
input voltage applied but is turned off via the On/Off Control pin. The specification
defines the interval between the time at which the converter is turned on and the
fully loaded output voltage enters and remains within its specified accuracy band.
Similar to the V
IN
to V
OUT
start-up, the On/Off Control to V
OUT
start-up time is also
governed by the internal soft start circuitry and external load capacitance.
On/Off Control
The input-side, remote On/Off Control function (pin 3) can be ordered to operate
with either polarity. Positive-polarity devices ("C" suffix) are enabled when pin
3 is left open (or is pulled high, +13V to V
IN
applied with respect to –Input, pin
2, see Figure 2). Positive-polarity devices are disabled when pin 3 is pulled low
(0-0.8V with respect to –Input). Negative-polarity devices are off when pin 3 is
left open (or pulled high, 3.5V to V
IN
), and on when pin 3 is pulled low (0-0.5V).
See Figure 5.
1
+INPUT
0
10
20
30
40
50
60
70
80
90
100
Output Load Regulation (%)
Figure 4. Output Voltage Accuracy vs. Imbalanced Loading
Current Limiting
3
13V CIRCUIT
ON/OFF
CONTROL
When output current increases to approximately 15% to 50% above the rated
output current, the DC/DC converter will go into a current limiting mode. In
this condition the output voltage will decrease proportionately with increases
in output current, thereby maintaining a somewhat constant power dissipa-
tion. This is commonly referred to as power limiting. Current limit inception
is defined as the point where the full-power output voltage falls below the
specified tolerance. See Performance/Functional Specifications. If the load
current being drawn from the converter is significant enough, the unit will go
into a short circuit condition. See "Short Circuit Condition."
Short Circuit Condition
When a converter is in current limit mode the output voltages will drop as
the output current demand increases. If the output voltage drops too low, the
magnetically coupled voltage used to develop primary side voltages will also
drop, thereby shutting down the PWM controller.
Following a time-out period, the PWM will restart, causing the output voltages
to begin ramping to their appropriate values. If the short-circuit condition
persists, another shutdown cycle will be initiated. This on/off cycling is
referred to as "hiccup" mode. The hiccup cycling reduces the average output
current, thereby preventing internal temperatures from rising to excessive
levels. The BWR 15-17W Series is capable of enduring an indefinite short
circuit output condition.
Thermal Shutdown
These BWR converters are equipped with Thermal Shutdown Circuitry. If
environmental conditions cause the internal temperature of the DC/DC con-
verter rises above the designed operating temperature, a precision tempera-
ture sensor will power down the unit. When the internal temperature decreases
below the threshold of the temperature sensor the unit will self start.
5V CIRCUIT
2
–INPUT
Figure 4. Driving the Positive Polarity On/Off Control Pin
1
+INPUT
3
ON/OFF
CONTROL
2
–INPUT
Figure 5. Driving the Negative Polarity On/Off Control Pin
Dynamic control of the remote on/off function is best accomplished with a
mechanical relay or an open-collector/open-drain drive circuit (optically isolated
if appropriate). The drive circuit should be able to sink appropriate current (see
Performance Specs) when activated and withstand appropriate voltage when
deactivated.
Applying an external voltage to pin 3 when no input power is applied to the
converter can cause permanent damage to the converter.
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MDC_BWR15-17W.B11
Page 5 of 9
Embedded System
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