BWR-15 Datasheet, PDF (3/6 Pages) C&D Technologies – Dual Output A-Series, BWR Models

A Series
15-20W, DUAL OUTPUT DC/DC CONVERTERS
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted. ➀
Input
Input Voltage Range:
D5A Models
D12A Models
D48A Models
4.7-7.5 Volts (5V nominal)
9-36 Volts (24V nominal)
18-75 Volts (48V nominal)
Input Current
See Ordering Guide
Input Filter Type 
Pi
Overvoltage Shutdown:
D5A Models
D12A Models
D48A Models
10 Volts
40 Volts
80 Volts
Reverse-Polarity Protection
Yes (Instantaneous, 10A maximum)
On/Off (Sync.) Control (Pin 4) 
TTL high = off, low (or open) = on
Output
VOUT Accuracy (50% load):
±5V Outputs
±9/12/15V Outputs
±1.5%, maximum
±1%, maximum
Temperature Coefficient
±0.02% per °C
Ripple/Noise (20MHz BW) 
See Ordering Guide
Line/Load Regulation
See Ordering Guide
Efficiency
See Ordering Guide
Isolation Voltage 
1500Vdc, minimum
Isolation Capacitance
550pF
Current Limiting
Auto-recovery
Overvoltage Protection
Zener/transorb clamps, magnetic feedback
Dynamic Characteristics
Transient Response (50% load step) 200µsec max. to ±1.5% of final value
Switching Frequency
165kHz (±15kHz)
Environmental
Operating Temperature (ambient):
Without Derating
With Derating
–40 to +50/55/60°C (Model dependent)
to +100°C (See Derating Curves)
Storage Temperature
–40 to +105°C
Flammability
UL 94V-0
Physical 
Dimensions
2" x 2" x 0.45" (51 x 51 x 11.4mm)
Shielding
5-sided
Case Connection:
D5A and D12A Models
D48A Models
Pin 2 (–VIN)
Pin 1 (+VIN)
Case Material


Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
Pin Material
Gold-plated copper alloy
Weight
2.7 ounces (75.6 grams)
➀ These converters require a minimum 20% loading on each output 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 C&D Applications Engineering for details.
➂ Applying a voltage to the Control pin when no input power is applied to the converter can
cause permanent damage to the converter.
➃ "D48A" models have BASIC, "D5A" and "D12A" models have Functional insulation.
Devices can be screened or modified for higher guaranteed isolation voltages.
Contact C&D Applications Engineering for details.
Absolute Maximum Ratings
Input Voltage:
D5A Models
D12A Models
D48A Models
12 Volts
44 Volts
88 Volts
Input Reverse-Polarity Protection

Current must be <10A. Brief
duration only. Fusing recommended.
Output Overvoltage Protection
±5V Outputs
±12V Outputs
±15V Outputs
6.8 Volts, limited duration
15 Volts, limited duration
18 Volts, limited duration
Output Current
Current limited. Max. current and
short-circuit duration are model

dependent.
Storage Temperature
–40 to +105°C
Lead Temperature (soldering, 10 sec.) +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 5 and 7), with either output grounded.
The Common pin (pin 6) should be left open. Minimum 20% loading is
recommended under these conditions. The total output voltage span may be
externally trimmed as described below.
Filtering and Noise Reduction
All A-Series BWR 15-20 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 capac-
itors should be connected between their respective output pin (pin 5 or 7) and
Common (pin 6) 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
D5A Models
D12A Models
D48A Models
47µF, 16V
20µF, 50V
20µF, 100V
To Reduce Output Ripple
±5V Outputs
±9/12/15V Outputs
47µF, 10V, Low ESR
22µF, 20V, Low ESR
In critical, space-sensitive applications, C&D may be able to tailor the internal
input/output filtering of these units to meet your specific requirements. Con-
tact our Applications Engineering Group for additional details.
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