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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
@ 3A/3.3V @ 4.25A simultaneously
5V
delivered
Independent V
OUT
Trim pins for margining
Independent On/Off Control pins
efficiency; 75mV ripple/noise
88%
ranges: 10-18V, 18-36V or 36-75V
Input
1950 and EN60950-1 safety approvals
UL
isolated, 1500Vdc guaranteed
Fully
under and overvoltage shutdown
Input
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
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MDC_BWR30.B04
Page 1 of 6
Dual Output BWR Models
Performance Specifications and Ordering Guide
➀
ORDERING GUIDE
Output
Models
➅
BWR-5/3-3.3/4.25-D12A
BWR-5/3-3.3/4.25-D24A
BWR-5/3-3.3/4.25-D48A
Mixed Voltage, 5V and 3.3V, Independent Dual Output
30 Watt DC/DC Converters
Input
V
OUT
(Volts)
5
3.3
5
3.3
5
3.3
I
OUT
➁
(Amps)
3
4.25
3
4.25
3
4.25
R/N (mVp-p)
➂
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
➃
±1%
±1%
±1%
±1%
±1%
±1%
V
IN
Nom.
(Volts)
12
24
48
Range
(Volts)
10-18
18-36
36-75
I
IN
➄
(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
➀
Typical at T
A
= +25°C under nominal line voltage and "full-load" conditions.
➁
Any combination of 5V/3.3V current, not to exceed the published I
OUT
specification (30 Watts).
➂
Ripple/Noise (R/N) measured over a 20MHz bandwidth with 0.47µF ceramic output capacitors.
➃
Tested from 10% load to 100% load.
➄
Nominal line voltage, no load/full load condition.
➅
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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MDC_BWR30.B04
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.
➀
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):
➂ ➄
D12A, D24A & D48A Models
"N" Suffix Models
➇
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:
➁
V
IN
to V
OUT
On/Off to V
OUT
Switching Frequency
MTBF
➅
200µsec maximum
200µsec maximum
10ms
TBD
355kHz (±35kHz)
Environmental
<0.1Ω, 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):
➁
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
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
➆
Ripple/Noise
(20MHz BW)
➃
Line/Load Regulation
Efficiency
Trim Range
➁
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
100MΩ
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
➀
All models are specified with external 0.47µF ceramic output capacitors.
➁
See Technical Notes/Graphs for details.
➂
Applying a voltage to On/Off Control (pins 3 & 4) when no input power is applied to the
converter can cause permanent damage.
➃
Output noise may be further reduced with the installation of additional external output
capacitors. See Technical Notes.
➄
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).
➅
Demonstrated MTBF available on request.
➆
For conditions with less than minimum loading, outputs remain stable. However, regulation
performance will degrade.
➇
Maximum applied voltage to On/Off pin (N suffix) less than 19.0V.
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MDC_BWR30.B04
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
➁
+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
(kΩ) =
2.49(V
O
– 2.52)
5 – V
O
–15
3.3V R
T
DOWN
(kΩ) =
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
(kΩ) =
6.27
V
O
– 5
–15
3.3V R
T
UP
(kΩ) =
3.16
V
O
– 3.3
–14.3
Figure 4. Trim Connections To Increase Output Voltages Using Fixed Resistors
Note: Resistor values are in kΩ. 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
20kΩ
5-22
TURNS
+5V
LOAD
6
8
20kΩ
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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MDC_BWR30.B04
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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MDC_BWR30.B04
Page 5 of 6
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