BWR Models
3W, DUAL OUTPUT DC/DC CONVERTERS
3
Input Voltage:
"D5" Models 12 Volts
"D12" Models 20 Volts
"D48" Models 80 Volts
Input Reverse-Polarity Protection Current must be <2A. Brief duration
only. Fusing recommended.
Output Overvoltage Protection None
Output Current Current limited. Max. current and
short-circuit duration are model
dependent. "D12" and "D48" models
can withstand sustained output short
circuits.
Storage Temperature –40 to +100°C
Lead Temperature (soldering, 10 sec.) +300°C
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted.
➀
Input
Input Voltage Range:
"D5" Models 4.5-9 Volts (5V nominal)
"D12" Models 9-18 Volts (12V nominal)
"D48" Models 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 Power-limiting technique, auto-recovery
"D12" and "D48" Models Hiccup technique, auto-recovery
Dynamic Characteristics
Transient Response (50% load step) 200µsec to ±1% of final value
Switching Frequency:
"D5" Models 200kHz
"D12" and "D48" Models 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 Brass, solder coated
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 DA TEL's new BST 3W Models
for guaranteed operation to –40°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 T able is not implied.
Absolute Maximum Ratings
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 installing
electrolytic capacitors across the input terminals and/or low-ESR tantalum 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. T ypical 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 47µF , 15V
"D12" Models 10µF, 35V
"D48" Models 4.7µF, 100V
To Reduce Output Ripple
±5V Outputs 47µF, 10V, Low ESR
±12/15V Outputs 22µF, 20V, Low ESR
In critical, space-sensitive applications, DA TEL may be able to tailor the internal
input/output filtering of these units to meet your specific requirements. Contact
our Applications Engineering Group for additional details.