A Series
1 5 - 2 0 W , D U A L O U T P U T D C / D C C O N V E R T E R S
Performance/Functional Specifications
Typical @ TA = +2±°C under nominal line voltage and full-load conditions, unless noted. ➀
Absolute Maximum Ratings
Input Voltage:
Input
Input Voltage Range:
D±A Models
Dꢀ2A Models
D48A Models
4.7-7.± Volts (±V nominal)
9-36 Volts (24V nominal)
ꢀ8-7± Volts (48V nominal)
D±A Models
Dꢀ2A Models
D48A Models
ꢀ2 Volts
44 Volts
88 Volts
Input Current
See Ordering Guide
Pi
Input Reverse-Polarity Protection
Current must be <ꢀ5A. Brief
duration only. Fusing recommended.
Input Filter Type ➁
Output Overvoltage Protection
±±V Outputs
±ꢀ2V Outputs
Overvoltage Shutdown:
D±A Models
6.8 Volts, limited duration
ꢀ± Volts, limited duration
ꢀ8 Volts, limited duration
ꢀ5 Volts
45 Volts
85 Volts
Dꢀ2A Models
±ꢀ±V Outputs
D48A Models
Output Current
Current limited. Max. current and
short-circuit duration are model
dependent.
Reverse-Polarity Protection
Yes (Instantaneous, ꢀ5A maximum)
TTL high = off, low (or open) = on
On/Off (Sync.) Control (Pin 4) ➂
Output
Storage Temperature
–45 to +ꢀ5±°C
+355°C
VOUT Accuracy (±5ꢁ load):
±±V Outputs
Lead Temperature (soldering, ꢀ5 sec.)
±ꢀ.±ꢁ, maximum
±ꢀꢁ, maximum
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.
±9/ꢀ2/ꢀ±V Outputs
Temperature Coefficient
Ripple/Noise (25MHz BW) ➁
Line/Load Regulation
Efficiency
±5.52ꢁ per °C
See Ordering Guide
See Ordering Guide
See Ordering Guide
ꢀ±55Vdc, minimum
±±5pF
T E C H N I C A L N O T E S
Isolation Voltage ➃
Isolation Capacitance
Current Limiting
Floating Outputs
Auto-recovery
Since these are isolated DC/DC converters, their outputs are "floating." Any
BWR model may be configured to produce an output of ꢀ5V, 24V or 35V
(for ±±V, ±ꢀ2V or ±ꢀ±V models, respectively) by applying the load across
the +Output and –Output pins (pins ± and 7), with either output grounded.
The Common pin (pin 6) should be left open. Minimum 25ꢁ loading is
recommended under these conditions. The total output voltage span may be
externally trimmed as described below.
Overvoltage Protection
Zener/transorb clamps, magnetic feedback
Dynamic Characteristics
Transient Response (±5ꢁ load step)
255µsec max. to ±ꢀ.±ꢁ of final value
ꢀ6±kHz (±ꢀ±kHz)
Switching Frequency
Environmental
Operating Temperature (ambient):
Without Derating
–45 to +±5/±±/65°C (Model dependent)
to +ꢀ55°C (See Derating Curves)
Filtering and Noise Reduction
With Derating
All A-Series BWR ꢀ±-25 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 ± 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.
Storage Temperature
Flammability
–45 to +ꢀ5±°C
UL 94V-5
Physical
Dimensions
Shielding
2" x 2" x 5.4±" (±ꢀ x ±ꢀ x ꢀꢀ.4mm)
±-sided
Case Connection:
D±A and Dꢀ2A Models
D48A Models
Pin 2 (–VIN)
Pin ꢀ (+VIN)
Case Material
Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
To Reduce Input Ripple
D±A Models
Dꢀ2A Models
D48A Models
47µF, ꢀ6V
25µF, ±5V
25µF, ꢀ55V
Pin Material
Weight
Gold-plated copper alloy
2.7 ounces (7±.6 grams)
To Reduce Output Ripple
±±V Outputs
➀ These converters require a minimum 25ꢁ 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.
47µF, ꢀ5V, Low ESR
22µF, 25V, Low ESR
±9/ꢀ2/ꢀ±V Outputs
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.
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.
➃ "D48A" models have BASIC, "D±A" and "Dꢀ2A" models have Functional insulation.
Devices can be screened or modified for higher guaranteed isolation voltages.
Contact C&D Applications Engineering for details.
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