TWR Models
High-Reliability,
2" x 1", 8-11 W, Triple Output DC/DC Converters
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted. ➀
Input
Absolute Maximum Ratings
Input ꢁoltage Ranges:
Input Voltage:
"D5A" Models
"D±2A" Models
"D24A" Models
"D48A" Models
4.7-7 ꢁolts (5ꢁ nominal)
9-±8 ꢁolts (±2ꢁ nominal)
±8-36 ꢁolts (24ꢁ nominal)
36-72 ꢁolts (48ꢁ nominal)
"D5A" Models
"D±2A" Models
"D24A" Models
"D48A" Models
±0 ꢁolts
22 ꢁolts
44 ꢁolts
80 ꢁolts
Input Reverse-Polarity Protection
Current must be <6A. Brief
duration only. Fusing recommended.
Input Current
See Ordering Guide
Input Filter Type
Pi
Output Overvoltage Protection
+5ꢁ Output
±±2ꢁ Outputs
Reverse-Polarity Protection
Yes (Instantaneous, 6A maximum)
6.8 ꢁolts, limited duration
±±3 ꢁolts, limited duration
±±6 ꢁolts, limited duration
Output
±±5ꢁ Outputs
ꢁOUT Accuracy (50% loads):
+5ꢁ Output
Output Current
Current limited. Max. current and
short-circuit duration model
dependent.
±0.5%
±3%
±±2ꢁ or ±±5ꢁ Outputs
Temperature Coefficient
RippleꢀNoise (20MHz BW)
LineꢀLoad Regulation
Efficiency
±0.02% per °C
Storage Temperature
–40 to +±05°C
+300°C
See Ordering Guide
See Ordering Guide
See Ordering Guide
±500ꢁdc, minimum
300pF
Lead Temperature (soldering, ±0 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.
Isolation ꢁoltage
Isolation Capacitance
Current Limiting
Auto-recovery
TECHNICAL NOTES
Overvoltage Protection
Zenerꢀtransorb clamps, magnetic feedback
Dynamic Characteristics
Filtering and Noise Reduction
Transient Response (50% load step)
Switching Frequency
200µsec max. to ±2% of final value
±75kHz
All A-Series TWR 8-11 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 capaci-
tors should be connected between their respective output pin (pin 4, 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 below. In many
applications, using values greater than those listed will yield better results.
Environmental
Operating Temperature (Ambient):
Without Derating
–40 to +60ꢀ70°C (Model dependent)
to +±00°C (See Derating Curve)
With Derating
Storage Temperature
Flammability
–40 to +±05°C
UL94ꢁ-0
Physical
To Reduce Input Ripple
Dimensions
2" x ±" x 0.375" (5± x 25 x 9.5mm)
"D5A" Models
"D12A" Models
"D24A" Models
"D48A" Models
47μF, 10V
20μF, 25V
20μF, 50V
10μF, 100V
Shielding
5-sided
Case Connection
Case Material
Pin 2 (–ꢁIN)
Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
To Reduce Output Ripple
+5V Output
47μF, 10V, Low ESR
Pin Material
Weight
Gold-plated copper alloy
±.3 ounces (37 grams)
12/15V Outputs 22μF, 20V, Low ESR
In critical, space-sensitive applications, DATEL 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.
These power converters require a minimum ±0% loading on their primary output and a
minimum 20% loading on their auxiliary outputs 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 inputꢀoutput filtering can be recommended or perhaps added
internally upon request. Contact DATEL Applications Engineering for details.
Devices can be screened or modified for higher guaranteed isolation voltages.
Contact DATEL Applications Engineering for details.
On "D48A" models, the case is connected to pin ± (+ꢁIN).
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