BWR-12 Datasheet, PDF (3/4 Pages) Murata Manufacturing Co., Ltd. – 3 Watt, Dual Output DC/DC Converters

Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ^
Input
Input Voltage Range:
"D5" Models
"D12" Models
"D48" Models
4.5-9 Volts (5V nominal)
9-18 Volts (12V nominal)
18-72 Volts (48V nominal)
Input Current
See Ordering Guide
Input Filter Type ➁
Pi
Reverse-Polarity Protection
Yes (Instantaneous, 2A maximum)
Output
VOUT Accuracy (50% load)
±1%, maximum
Temperature Coefficient
±0.02% per °C
Ripple/Noise (20MHz BW) ➁
See Ordering Guide
Line/Load Regulation
See Ordering Guide
Efficiency
See Ordering Guide
Isolation Voltage ➂
1000Vdc, minimum
Current Limiting:
"D5" Models
"D12" and "D48" Models
Power-limiting technique, auto-recovery
Hiccup technique, auto-recovery
Dynamic Characteristics
Transient Response (50% load step) 200µsec to ±1% of final value
Switching Frequency:
"D5" Models
"D12" and "D48" Models
200kHz
170kHz
Environmental
Operating Temperature ➃
(Ambient, no derating)
–25 to +75°C
Storage Temperature
–40 to +100°C
Physical
Dimensions
1.25" x 0.8" x 0.45" (31.8 x 20.3 x 11.4mm)
Case Material
Diallyl phthalate, UL94V-0-rated
Pin Material
RoHS: Gold plate over copper alloy
Non RoHS: Tin plate over copper alloy
Weight
0.5 ounces (14.2 grams)
➀ These power converters require a minimum 10% 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 upon request. Contact DATEL Applications Engineering for details.
➂ Devices can be screened or modified for higher guaranteed isolation voltages.
Contact DATEL Applications Engineering for details.
➃ Devices can be warranted or screened for lower-temperature operation.
Contact DATEL Applications Engineering for details. See DATEL's new BST 3W Models
for guaranteed operation to –40°C.
BWR Series
3 Watt, Dual Output DC/DC Converters
Absolute Maximum Ratings
Input Voltage:
"D5" Models
"D12" Models
"D48" Models
Input Reverse-Polarity Protection
Output Overvoltage Protection
Output Current
models
sustained output short
Storage Temperature
Lead Temperature (soldering, 10 sec.)
12 Volts
20 Volts
80 Volts
Current must be <2A. Brief duration
only. Fusing recommended.
None
Current limited. Max. current and
short-circuit duration are model
dependent. "D12" and "D48"
can withstand
circuits.
–40 to +100°C
+300°C
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
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 (pins 6 and 8), with either output grounded.
The Common (pins 5 and 7) should be left open. Minimum 20% loading is
recommended under these conditions.
Filtering and Noise Reduction
All BWR 3 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 electrolytic capacitors across the input terminals and/or low-ESR tanta-
lum or electrolytic capacitors across the output terminals. Output capacitors
should be connected between their respective output pin (pin 6 or 8) and
Common (pins 5 and 7) as shown in Figure 2. The caps should be located
as close to the power converters as possible. Typical values are listed in the
tables below. In many applications, using values greater than those listed
will yield better results.
To Reduce Input Ripple
"D5" Models
"D12" Models
"D48" Models
47µF, 15V
10µF, 35V
4.7µF, 100V
To Reduce Output Ripple
±5V Outputs
±12/15V Outputs
47µF, 10V, Low ESR
22µF, 20V, Low ESR
In critical, space-sensitive applications, DATEL 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/support
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