Dual Output BWR Models
Mixed Voltage, 5V and 3.3V, Independent Dual Output
30 Watt DC/DC Converters
FEATURES
Independently regulated 5V/ 3.3V outputs
5V @ 3A/3.3V @ 4.25A simultaneously
delivered
Independent V
OUT
Trim pins for margining
Independent On/Off Control pins
88% efficiency; 75mV ripple/noise
Input ranges: 10-18V, 18-36V or 36-75V
UL 1950 and EN60950-1 safety approvals
Fully isolated, 1500Vdc guaranteed
Input under and overvoltage shutdown
Independent OVP; short circuit protection
Thermal shutdown
PRODUCT OVERVIEW
Murata Power Solutions' BWR series of DC/DC con-
verters now includes two independent converters in
one 2" x 2" package. The BWR-5/3-3.3/4.25 family
provides both 5V at 3 Amps and 3.3V at 4.25 Amps
for a combined output power of 30 Watts from input
ranges of 10V to 18V (-D12A), 18 to 36V (-D24A), or
36 to 75V (-D48A).
Each output is regulated by its own control loop
to provide ±1% load and ±0.5% line regulation.
Individual trim pins and a negative or positive
on/off control pin allow independent adjustment of
output voltages and any combination of power-on
sequencing between the 5V and 3.3V outputs. A
high efficiency of 88% allows full load operation
up to +65°C ambient temperature in a still air
environment. Although functionally indepen-
dent, both outputs are driven from synchronized
PWMs to prevent asynchronously generated beat
frequencies.
Housed in a plastic case, all models include
input Pi filtering, input overvoltage protection,
independent output short circuit and current
limiting protection and independent output
overvoltage protection as well as thermal shut-
down. These devices meet IEC950, UL1950 and
EN6950-1 safety standards. CB reports are avail-
able upon request. "D48A" models are CE marked
(meet LVD requirements).
+INPUT
(1)
+5V OUTPUT
(5)
–INPUT
(2)
5V ON/OFF
CONTROL
(3)
INPUT UNDERVOLTAGE
AND OVERVOLTAGE
COMPARATORS
PWM
CONTROLLER
SWITCH
CONTROL
+5V OUTPUT
RETURN
(6)
OPTO
ISOLATION
REFERENCE &
ERROR AMP
+5V TRIM
(7)
+3.3V TRIM
(10)
3.3V ON/OFF
CONTROL
(4)
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
+3.3V OUTPUT
(9)
SWITCH
CONTROL
+3.3V OUTPUT
RETURN
(8)
Typical topology is shown.
Figure 1. Simplified Schematic
For full details go to
www.murata-ps.com/rohs
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Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_BWR30.B02
Page 1 of 6
Dual Output BWR Models
Performance Specifications and Ordering Guide
ORDERING GUIDE
Output
V
OUT
(Volts)
5
3.3
5
3.3
5
3.3
I
OUT
(Amps)
3
4.25
3
4.25
3
4.25
R/N (mVp-p)
Typ.
75
75
75
75
75
75
Max.
100
100
100
100
100
100
Regulation (Max.)
Line
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
Load
±1%
±1%
±1%
±1%
±1%
±1%
V
IN
Nom.
(Volts)
12
24
48
Input
Range
(Volts)
10-18
18-36
36-75
I
IN
(mA/A)
210/2846
115/1374
70/687
Efficiency
Min.
83%
85.5%
85.5%
Typ.
85%
88%
88%
Package
(Case,
Pinout)
C20, P42
C20, P42
C20, P42
Mixed Voltage, 5V and 3.3V, Independent Dual Output
30 Watt DC/DC Converters
Models
BWR-5/3-3.3/4.25-D12A
BWR-5/3-3.3/4.25-D24A
BWR-5/3-3.3/4.25-D48A
Typical at T
A
= +25°C under nominal line voltage and "full-load" conditions.
Any combination of 5V/3.3V current, not to exceed the published I
OUT
specification (30 Watts).
Ripple/Noise (R/N) measured over a 20MHz bandwidth with 0.47μF ceramic output capacitors.
Tested from 10% load to 100% load.
Nominal line voltage, no load/full load condition.
These are incomplete model numbers. Please refer to the part number structure when ordering.
PART NUMBER STRUCTURE
BWR
-
5
/
3
-
3.3
/
4.25
-
D48 A N LX
-
C
Dual Output/
Mixed-Voltage Series
V
1
Nominal Output Voltage:
5 Volts
I
1
Maximum Output Current:
3 Amps
V
2
Nominal Output Voltage:
3.3 Volts
RoHS-6
Optional Functions
A-Series
High Reliability
Input Voltage Range:
D12A
= 10-18 Volts (12V nominal)
D24A
= 18-36 Volts (24V nominal)
D48A
= 36-75 Volts (48V nominal)
I
2
Maximum Output Current:
4.25 Amps
Optional Functions
BWR 30 Watt DC/DC's are designed so a negative logic
on/off control ("N" suffix) can be added in the pins 3 and 4 position.
Blank
N
L1
L2
-Y
-C
Standard product. No options specified.
Negative polarity on/off control
Pin length: 0.110 in. (2.79mm) ±0.010
Pin length: 0.145 in. (3.68mm) ±0.010
RoHS-5 Hazardous substance compliance
RoHS-6 Hazardous substance compliance
Refer to the last page for additional options.
Note:
Not all model number combinations are available.
Contact Murata Power Solutions (DATEL).
MECHANICAL SPECIFICATIONS
2.00
(50.08)
PLASTIC CASE
0.48
(12.19)
Case C20
STANDOFF
0.020 (0.51)
0.20 MIN
(5.08)
0.040 ±0.001 DIA.
(1.016 ±0.025)
I/O Connections
Pin
1
2
3
4
5
6
7
1.600
(40.64)
1.200
(30.48)
Function P42
+Input
–Input
+5V On/Off
+3.3V On/Off
+5V Output
+5V Return
+5V Trim
+3.3V Return
+3.3V Output
+3.3V Trim
1.800
(45.72)
0.10
(2.54)
5
6
7
1
2.00
(50.80)
0.600
(15.24)
3 EQ. SP. @
0.200 (5.08)
8
9
10
2
3
4
0.300
(7.62)
8
0.600
(15.24)
1.000
(25.40)
9
10
BOTTOM VIEW
DIMENSIONS ARE IN INCHES (MM)
0.200
0.20 (5.08)
(5.08)
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Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_BWR30.B02
Page 2 of 6
Dual Output BWR Models
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage, balanced "full-load" conditions, unless noted.
Input
Output (continued)
Mixed Voltage, 5V and 3.3V, Independent Dual Output
30 Watt DC/DC Converters
Input Voltage Range:
D12A Models
D24A Models
D48A Models
Overvoltage Shutdown:
D12A Models
D24A Models
D48A Models
Start-Up Threshold:
D12A Models
D24A Models
D48A Models
Undervoltage Shutdown:
D12A Models
D24A Models
D48A Models
Input Current:
Normal Operating Conditions
Standby Mode:
Off, OV, UV, Thermal Shutdown
Input Reflected Ripple Current:
Source Impedance
D12A Models
D24A/D48A Models
Internal Input Filter Type
Reverse-Polarity Protection:
D12A Models
D24A Models
D48A Models
On/Off Control
(Pins 3 & 4):
D12A, D24A & D48A Models
10-18 Volts (12V nominal)
18-36 Volts (24V nominal)
36-75 Volts (48V nominal)
18.5-21 Volts (20V nominal)
37-40 Volts (38V typical)
77-81 Volts (79V typical)
9.4-10 Volts (9.6V typical)
16.5-18 Volts (17V typical)
34-36 Volts (35V typical)
7-8.5 Volts (8V typical)
16-17.5 Volts (16.5V typical)
32.5-34.5 Volts (33.5V typical)
See Ordering Guide
10mA typical
Overvoltage Protection:
5V Output
3.3V Output
Maximum Capacitive Loading
D12A Models 3.3V
5V
D24A, D48A Models 3.3V
5V
Temperature Coefficient
Magnetic feedback, transorb
6.0 Volts
4.1 Volts
1000μF
680μF
1000μF
680μF
±0.02% per °C
Dynamic Characteristics
Dynamic Load Response:
5V (50-100% load step to 1% V
OUT
)
3.3V (50-100% load step to 1% V
OUT
)
Start-Up Time:
V
IN
to V
OUT
On/Off to V
OUT
Switching Frequency
200μsec maximum
200μsec maximum
10ms
TBD
355kHz (±35kHz)
Environmental
MTBF
<0.1 , no external input filtering
TBD
TBD
Pi (0.022μF - 4.7μH - 2.46μF)
1 minute duration, 6A maximum
1 minute duration, 4A maximum
1 minute duration, 2A maximum
On = open or 13V to +V
IN
,
I
IN
= 1.6mA @ 13V
Off = 0-0.8V, I
IN
= 2mA @ 0V
On = 0-1.2V, I
IN
= 2mA @ 0V
Off = open.
Output
D12A Models
D24A Models
D48A Models
Operating Temperature
(Ambient):
Without Derating:
D12A Models
D24A & D48A Models
With Derating
Case Temperature:
Maximum Operational
For Thermal Shutdown
Storage Temperature
Bellcore, ground fixed, full power
25°C ambient
873.9 thousand hours
1.32 million hours
1.23 million hours
–40 to +60°C
–40 to +65°C
To +100°C (See Derating Curves)
+100°C
+100°C minimum, +110°C maximum
–40 to +120°C
Physical
"N" Suffix Models
Dimensions
Case Material
Pin Material
Weight:
2" x 2" x 0.5" (50.8 x 50.8 x 12.7mm)
Diallyl phthalate, UL94V-0 rated
Gold-plated copper alloy
2.7 ounces (76.5 grams)
V
OUT
Accuracy
5V Output
3.3V Output
Minimum Loading Per Specification
Minimum Loading For Stability
Ripple/Noise
(20MHz BW)
Line/Load Regulation
Efficiency
Trim Range
Isolation Voltage:
Input-to-Output
Isolation Resistance
Isolation Capacitance
Current Limit Inception:
5V @ 98.5% V
OUT
3.3V @ 98.5% V
OUT
Short Circuit Current:
5V Output
3.3V Output
±1.5% maximum
±1.5% maximum
10% of I
OUT
maximum
No load
See Ordering Guide
See Ordering Guide
See Ordering Guide
±5%
1500Vdc minimum
100M
470pF
3.8-5.1 Amps
5.4-6.8 Amps
3.0 Amps average current
3.0 Amps average current
Primary to Secondary Insulation Level
Operational
All models are specified with external 0.47μF ceramic output capacitors.
See Technical Notes/Graphs for details.
Applying a voltage to On/Off Control (pins 3 & 4) when no input power is applied to the
converter can cause permanent damage.
Output noise may be further reduced with the installation of additional external output
capacitors. See Technical Notes.
On/Off control is designed to be driven with open collector or by appropriate voltage levels.
Voltages must be referenced to the –Input (pin 2).
Demonstrated MTBF available on request.
For conditions with less than minimum loading, outputs remain stable. However, regulation
performance will degrade.
Maximum applied voltage to On/Off pin (N suffix) less than 19.0V.
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_BWR30.B02
Page 3 of 6
Dual Output BWR Models
Absolute Maximum Ratings
Input Voltage:
Continuous:
Mixed Voltage, 5V and 3.3V, Independent Dual Output
30 Watt DC/DC Converters
+5V OUTPUT
1
+INPUT
+5V RETURN
2
–INPUT
5
+5V LOAD
6
D12A Models
D24A Models
D48A Models
Transient (100msec): D12A Models
D24A Models
D48A Models
23 Volts
42 Volts
81 Volts
25 Volts
50 Volts
100 Volts
Input Current must be limited. 1 minute
duration. Fusing recommended.
6 Amps
4 Amps
2 Amps
Current limited. Devices can withstand
an indefinite output short circuit.
Input Reverse-Polarity Protection
D12A Models
D24A Models
D48A Models
Output Current
+5V TRIM
7
5V R
TRIM DOWN
3
+5V
ON/OFF
CONTROL
+3.3V
ON/OFF
CONTROL
+3.3V RETURN
8
+3.3V LOAD
4
+3.3V OUTPUT
9
+3.3V TRIM
10
3.3V R
TRIM DOWN
On/Off Control (Pins 3 & 4) Max. Voltages
Referenced to –Input (pin 2)
D12A, D24A & D48A Models
+V
IN
"N" Models
±19V
Storage Temperature
Lead Temperature
(Soldering, 10 sec.)
–40 to +120°C
+300°C
5V R
T
DOWN
(k ) =
2.49(V
O
– 2.52)
5 – V
O
–15
3.3V R
T
DOWN
(k ) =
2.49(V
O
– 1.27)
3.3 – V
O
–14.3
Figure 3. Trim Connections To Decrease Output Voltages Using Fixed Resistors
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, nor recommended.
1
+INPUT
+5V OUTPUT
5
+5V LOAD
+5V RETURN
2
–INPUT
6
+5V TRIM
7
5V R
TRIM UP
TECHNICAL NOTES
3
Trimming Output Voltages
These BWR converters have a trim capability (pins 3 & 4) that allow users
to independently adjust the output voltages ±5%. Adjustments to the output
voltages can be accomplished via a trim pot, Figure 2, or a single fixed resistor
as shown in Figures 3 and 4. A single fixed resistor can increase or decrease
the output voltage depending on its connection. Fixed resistors should have
absolute TCR's less than 100ppm/°C to minimize sensitivity to changes in
temperature.
A single resistor connected from the 5V Trim pin (pin 7) to the +5V Output
(pin 5), see Figure 3, will decrease the +5V output voltage. A resistor con-
nected from the +5V Trim (pin 7) to the +5V Return (pin 6) will increase the
+5V output voltage. See Figure 4.
Similarly, the 3.3V output can be adjusted using a single resistor connected
from the +3.3V Trim (pin 10) to the +3.3V Output (pin 9) or to the +3.3V Return
(pin 8). See Figures 3 and 4.
+5V
ON/OFF
CONTROL
+3.3V
ON/OFF
CONTROL
+3.3V RETURN
8
+3.3V LOAD
4
+3.3V OUTPUT
9
+3.3V TRIM
10
3.3V R
TRIM UP
5V R
T
UP
(k ) =
6.27
V
O
– 5
–15
3.3V R
T
UP
(k ) =
3.16
V
O
– 3.3
–14.3
Figure 4. Trim Connections To Increase Output Voltages Using Fixed Resistors
Note: Resistor values are in k . Accuracy of adjustment is subject to
tolerances of resistors and factory-adjusted output accuracy.
V
O
= desired output voltage.
Typical Performance Curves
Output Power vs. Ambient Temperature
(V
IN
nominal, natural convection air flow.)
35
D24A, D48A
MODELS
30
Output Power (watts)
+5V OUTPUT
1
+INPUT
+5V TRIM
2
–INPUT
+5V RETURN
3
+5V
ON/OFF
CONTROL
+3.3V
ON/OFF
CONTROL
+3.3V RETURN
5
25
D12A MODELS
20
7
20k
5-22
TURNS
+5V
LOAD
6
8
20k
5-22
TURNS
15
10
+3.3V TRIM
10
4
+3.3V
LOAD
5
+3.3V OUTPUT
9
0
–40
–10
0
10
20
30
40
50
60
70
80
90
100
Figure 2. Trim Connections Using A Trim Pot
Ambient Temperature ( C)
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Technical enquiries
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+1 508 339 3000
MDC_BWR30.B02
Page 4 of 6
Dual Output BWR Models
Mixed Voltage, 5V and 3.3V, Independent Dual Output
30 Watt DC/DC Converters
Typical Performance Curves
Typical Start-Up from V
IN
(V
IN
= nominal, 5V @ 3A/3.3V @ 4.25A, 0.47μF output capacitors.)
D24A Models: Efficiency vs. Line and Load
89
88
V
IN
87
86
Efficiency (%)
85
84
83
82
81
80
79
18
24
5V@0.3A, 3.3V@4.25A
5V@3A, 3.3V@2.325A
5V@1.65A, 3.3V@4.25A
5V@3A, 3.3V@0.4A
5V
OUT
3.3V
OUT
30
36
Line Voltage (Volts)
2.5msec/div
D12A Models: Efficiency vs. Line and Load
87
89
5V@3A, 3.3V@4.25A
D48A Models: Efficiency vs. Line and Load
85
87
5V@3A, 3.3V@2.325A
Efficiency (%)
5V@3A, 3.3V@0A
81
Efficiency (%)
83
85
83
79
81
5V@0.3A, 3.3V@4.25A
5V@3A, 3.3V@0.4A
5V@1.65A, 3.3V@4.25A
77
5V@0A, 3.3V@4.25A
79
75
10
11.14
12.29
13.43
14.57
15.71
16.86
18
Line Voltage (Volts)
77
36
48
60
Line Voltage (Volts)
75
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Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_BWR30.B02
Page 5 of 6
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