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UWR Series
3 Watt, Single Output DC/DC Converters
Performance/Functional Speci?cations
Typical @ T A = +25°C under nominal line voltage and full-load conditions, unless noted. ?
Input Voltage Range:
Input
Absolute Maximum Ratings
"D5" Models
4.5-9 Volts (5V nominal)
Input Voltage:
"D12" Models
"D48" Models
Input Current
Input Filter Type ?
Reverse-Polarity Protection
V OUT Accuracy (50% load)
Temperature Coef?cient
Ripple/Noise (20MHz BW) ?
Line/Load Regulation
Ef?ciency
9-18 Volts (12V nominal)
18-72 Volts (48V nominal)
See Ordering Guide
Pi
Yes (Instantaneous, 2A maximum)
Output
±1%, maximum
±0.02% per °C
See Ordering Guide
See Ordering Guide
See Ordering Guide
"D5" Models
"D12" Models
"D48" Models
Input Reverse-Polarity Protection
Output Overvoltage Protection
Output Current
models
sustained output short
Storage Temperature
12 Volts
20 Volts
80 Volts
Current must be <2A. Brief duration
only. Fusing recommended.
None
Current limited. Max. current and
short-circuit duration are model
dependent. "D12" and "D48"
can withstand
circuits.
–40 to +100°C
Isolation Voltage ?
Current Limiting:
"D5" Models
"D12" and "D48" Models
1000Vdc, minimum
Power-limiting technique, auto-recovery
Hiccup technique, auto-recovery
Dynamic Characteristics
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 Speci?cations Table is not implied.
Transient Response (50% load step)
Switching Frequency:
"D5" Models
"D12" and "D48" Models
200μsec to ±1% of ?nal value
200kHz
170kHz
TECHNICAL NOTES
Floating Outputs
Operating Temperature ?
Environmental
Since these are isolated DC/DC converters, their outputs are "?oating." Us-
ers may ground either the Common (pins 5 and 7) for normal usage or the
(Ambient, no derating)
Storage Temperature
Dimensions
Case Material
Pin Material
Weight
–25 to +75°C
–40 to +100°C
Physical
1.25" x 0.8" x 0.45" (31.8 x 20.3 x 11.4mm)
Diallyl phthalate, UL94V-0-rated
Gold-plated copper alloy
0.5 ounces (14.2 grams)
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
speci?cations without the use of external input/output capacitors. In critical
applications, input/output ripple and noise may be further reduced by install-
ing electrolytic capacitors across the input terminals and/or low-ESR tanta-
lum or electrolytic capacitors across the output terminals. The caps should
? These power converters require a minimum 10% loading to maintain speci?ed regulation.
Operation under no-load conditions will not damage these devices; however they may not
meet all listed speci?cations.
? Application-speci?c internal input/output ?ltering can be recommended and perhaps
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.
added internally upon request. Contact DATEL Applications Engineering for details.
? Devices can be screened or modi?ed for higher guaranteed isolation voltages.
Contact DATEL Applications Engineering for details.
? Devices can be warranted or screened for lower-temperature operation.
Contact DATEL Applications Engineering for details.
To Reduce Input Ripple
"D5" Models
"D12" Models
"D48" Models
To Reduce Output Ripple
5V OutputS
12/15V Outputs
47μF, 15V
10μF, 35V
4.7μF, 100V
47μF, 10V, Low ESR
22μF, 20V, Low ESR
In critical, space-sensitive applications, DATEL may be able to tailor the inter-
nal input/output ?ltering of these units to meet your speci?c requirements.
Contact our Applications Engineering Group for additional details.
www.murata-ps.com/support
MDC_UWR3W Series.C02 Page 3 of 4
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