UWR Models
3W, SINGLE OUTPUT DC/DC CONVERTERS
3
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "floating." Users
may ground either the Common (pins 5 and 7) for normal usage or the positive
side (+Output, pins 6 and 8) to effectively reverse the output polarity .
Filtering and Noise Reduction
All UWR 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. 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
"D5" Models 47µF, 15V
"D12" Models 10µF, 35V
"D48" Models 4.7µF, 100V
To Reduce Output Ripple
5V Output 47µF, 10V , Low ESR
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.
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 UST 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