Input Voltage:
D5A Models 10 Volts
D12A Models 22 Volts
D24E Models 44 Volts
D48A and D48E Models 80 Volts
Input Reverse-Polarity Protection Current must be <6A. Brief
duration only. Fusing recommended.
Output Overvoltage Protection
5/5.2V Outputs 6.8 Volts, limited duration
12V Outputs 15 Volts, limited duration
15V Outputs 18 Volts, limited duration
Output Current Current limited.
Max. current and
short-circuit duration model
dependent.
Storage Temperature –40 to +105°C
These are stress ratings. Exposure of devices to greater than any of these conditions
may adversely affect long-term reliability. Proper operation under conditions other than
those listed in the Performance/Functional Specifi cations Table is not implied.
Absolute Maximum Ratings
TECHNICAL NOTES
➀ These power converters require a minimum 10% loading to maintain specifi ed regulation.
Operation under no-load conditions will not damage these devices; however they may
not meet all listed specifi cations.
➁ Application-specifi c input/output fi ltering can be recommended and perhaps added
internally upon request for scheduled, quantity orders. Contact Murata Power Solutions
Applications Engineering for details.
➂ Devices can be screened or modifi ed for higher guaranteed isolation voltages.
Contact Murata Power Solutions Applications Engineering for details.
➃ Except for 3.3V devices which have no protection.
Performance/Functional Specifi cations
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted. ➀
Input
Input Voltage Range:
D5A Models 4.7-7.25 Volts (5V nominal)
D12A Models 9-18 Volts (12V nominal)
D24E Models 18-36Volts (24V nominal
D48A Models 18-75 Volts (48V nominal)
D48E Models 36-72 Volts (48V nominal)
Input Current See Ordering Guide
Input Filter Type ➁ Pi
Overvoltage Shutdown:
D5A Models None
D12A Models 20 Volts
D24E Models 40 Volts
D48A and D48E Models 76 Volts
Reverse-Polarity Protection Yes (Instantaneous, 6A maximum)
Output
VOUT Accuracy (50% load) ±1%, maximum
Temperature Coeffi cient ±0.02% per °C
Ripple/Noise (20MHz BW) ➁ See Ordering Guide
Line/Load Regulation See Ordering Guide
Effi ciency See Ordering Guide
Isolation Voltage ➂ 1500Vdc, guaranteed
Isolation Capacitance 250pF
Current Limiting Auto-recovery
Overvoltage Protection ➃ Zener/transorb clamp, magnetic feedback
Dynamic Characteristics
Transient Response (50% load step) 200µsec max. to ±1.5% of fi nal value
Switching Frequency 165kHz (±15kHz)
Flammability UL94V-0
Environmental
Operating Temperature (Ambient):
Without Derating –40 to +60/65/70°C (Model dependent)
With Derating to +100°C (See Derating Curves)
Storage Temperature –40 to +105°C
Physical
Dimensions 2" x 1" x 0.375" (51 x 25 x 9.5mm)
Shielding 5-sided
Case Connection:
D5A, D12A and D24E Models Pin 2 (–V
IN)
D48A and D48E Models Pin 1 (+V
IN)
Case Material Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel fi nish and plastic baseplate
Pin Material Gold plate over copper alloy
Weight 1.3 ounces (37 grams)
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "fl oating."
Designers will usually use the output Common (pin 5) as the ground/return
of the load circuit. You can, however, use the +Output (pin 3) as ground/
return to effectively reverse the output polarity.
Filtering and Noise Reduction
All A-Series UWR 6-10 Watt DC/DC Converters achieve their rated ripple
and noise specifi cations without the use of external input/output capaci-
tors. 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
D5A Models 47µF, 10V
D12A and D24E Models 20µF, 50V
D48A and D48E Models 10µF, 100V
To Reduce Output Ripple
5/5.2V Outputs 47µF, 10V, Low ESR
12/15V Outputs 22µF, 20V, Low ESR
In critical, space-sensitive applications, Murata Power Solutions may be
able to tailor the internal input/output fi ltering of these units to meet your
specifi c requirements.
UWR Series
Single Output, High Reliability, 2" x 1", 6-10 Watt, DC-DC Converters
MDC_UWR6-10W Series.E01 Page 3 of 6
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