M I N I A T U R E ,
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W A T T D C / D C C O N V E R T E R S
BWR Models
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted. ■
Absolute Maximum Ratings
Input
Input Voltage Range:
Input Voltage:
"D24" Models
"D48" Models
"D24" Models
"D48" Models
18-36 Volts (24V nominal)
36-72 Volts (48V nominal)
44 Volts
88 Volts
Input Current
See Ordering Guide
Input Reverse-Polarity Protection
Current must be <6A. Brief
duration only. Fusing recommended.
Input Filter Type ■
LC on "D24" models
C on "D48" models
Output Overvoltage Protection
5V Outputs
12V Outputs
6.8 Volts, limited duration
15 Volts, limited duration
18 Volts, limited duration
Reverse-Polarity Protection
Yes (Instantaneous, 6A maximum)
Output
15V Outputs
VOUT Accuracy (50% load):
5V Outputs
Output Current
Current limited. Max. current and
short-circuit duration are model
dependent.
1.5%, maximum
1%, maximum
12/ 15V Outputs
Temperature Coefficient
Ripple/Noise (20MHz BW) ■
Line Regulation
0.02% per °C
Storage Temperature
–55 to +125°C
+300°C
See Ordering Guide
See Ordering Guide
See Ordering Guide
See Ordering Guide
1000Vdc, minimum
Auto-recovery
Lead Temperature (soldering, 10 sec.)
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.
Load Regulation
Efficiency
Isolation Voltage ■
Current Limiting
Overvoltage Protection
Zener/transorb clamps
T E C H N I C A L N O T E S
Dynamic Characteristics
Transient Response (50% load step)
500µsec max. to 1.5% of final value
170kHz ( 10kHz)
Floating Outputs
Switching Frequency
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 3 and 6), with either output grounded. The
Common (pin 4) should be left open. Minimum 20% loading is recommended
under these conditions.
Environmental
Operating Temperature (ambient): ■
Without Derating
–25 to +60°C
With Derating
to +95°C (See Derating Curve)
Storage Temperature
–55 to +125°C
Physical
Filtering and Noise Reduction
Dimensions
Shielding
1" x 1" x 0.45" (25.4 x 25.4 x 11.4mm)
5-sided
All BWR 5 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 low-ESR, tantalum or electrolytic capacitors across the input
and/or output terminals. Output capacitors should be connected between
their respective output pin (pin 3 or 6) and Common (pin 4)as shown in
Figure 2. The capacitors should be located as close to the power converters
as possible. Typical values are listed below. In many applications, using
values greater than those listed will yield better results.
Case Connection:
"D24" Models
Pin 2 (–VIN)
Pin 1 (+VIN)
"D48" Models
Case Material
Corrosion resistant steel with
epoxy-based enamel finish
Pin Material
Weight
Brass, solder coated
0.7 ounces (20 grams)
To Reduce Input Ripple
■ These power converters require a minimum 20% loading to maintain specified regulation.
Operation under no-load conditions will not damage these devices, however they may not
meet all listed specifications.
■ Application-specific internal input/output filtering can be recommended and perhaps added
internally on request. Contact DATEL Applications Engineering for details.
■ Units can be screened or modified for higher guaranteed isolation voltages.
Contact DATEL Applications Engineering for details.
"D24" Models
"D48" Models
20µF, 50V
10µF, 100V
To Reduce Output Ripple
5V Outputs
47µF, 10V, Low ESR
33µF, 20V, Low ESR
■ Units can be screened for lower-temperature operation.
Contact DATEL Applications Engineering for details.
12/15V Outputs
In critical, space-sensitive applications, DATEL may be able to tailor the
internal input/output filtering of these units to meet your specific require-
ments. Contact our Applications Engineering Group for additional details.
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