Input Voltage:
"D5A" Models 11 Volts
"D12A" Models 44 Volts
"D48A" and "D48E" Models 88 Volts
Input Reverse-Polarity Protection Current must be <10A. Brief
duration only. Fusing recommended.
Output Overvoltage Protection:
3.3V Outputs No protection
5V/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 are model
dependent
Storage Temperature –40 to +105°C
Lead Temperature See soldering guidelines
Floating Outputs
Since these are isolated DC/DC converters, their outputs are "fl oating."
Users may ground either the Common (pin 7) for normal usage or the posi-
tive side (+Output, pin 6) to effectively reverse the output polarity.
Filtering and Noise Reduction
All A-Series UWR 14-20 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 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 below. In many applications, using values greater than
those listed will yield better results.
To Reduce Input Ripple
D5A Models 47µF, 16V
D12A Models 20µF, 50V
D48A Models 20-50µF, 100V
To Reduce Output Ripple
3.3V Outputs 100µF, 6V, Low ESR
5V/5.2V Outputs 47µF, 10V, Low ESR
12/15V Outputs 22µF, 20V, Low ESR
Performance/Functional Specifi cations
Typical @ TA = +25°C under nominal line voltage and full-load conditions, unless noted. ➀
➀ These 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 Applying a voltage to the Control pin when no input power is applied to the converter can
cause permanent damage to the converter. TTL Logic High of +3.3V to +5V max will disable
the converter.
➂ "D48A" models have BASIC, all other models have Functional insulation. Devices can be
screened or modifi ed for higher guaranteed isolation voltages. Contact Murata Power Solu-
tions Applications Engineering for details.
Input
Input Voltage Range:
D5A Models 4.7-7.5 Volts (5V nominal)
D12A Models 9-36 Volts (24V nominal)
D48A/D48E Models 18-75/36-72 Volts (48V nominal)
Input Current See Ordering Guide
Input Filter Type Pi (C-type for D5A models)
Overvoltage Shutdown:
D5A Models 10 Volts
D12A Models 40 Volts
D48A and /D48E Models 80 Volts
Reverse-Polarity Protection Yes (Instantaneous, 10A maximum)
On/Off (Sync.) Control (Pin 4)➁ TTL high = off, low (or open) = on
Output
VOUT Accuracy (50% load) ±1%, maximum
Temperature Coeffi cient ±0.02% per °C
Ripple/Noise (20MHz BW) See Ordering Guide
Line/Load Regulation See Ordering Guide
Effi ciency See Ordering Guide
Isolation Voltage ➂ 1500Vdc guaranteed
Isolation Capacitance 550pF
Current Limiting Auto-recovery
Overvoltage Protection 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)
Environmental
Operating Temperature (Ambient):
Without Derating –40 to +40/50/55/65°C (Model dependent)
With Derating to +100°C (See Derating Curves)
Storage Temperature -40 to +105°C
Flammability UL94V-0
Physical
Dimensions 2" x 2" x 0.45" (51 x 51 x 11.4mm)
Shielding 5-sided
Case Connection:
D5A, D12A Models Pin 2 (–V
IN)
D48A, 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 RoHS: Gold-plated copper alloy
Non-RoHS: Tin over copper alloy
Weight 2.7 ounces (76.5 grams)
These are stress ratings. Exposure of devices in excess 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
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UWR Series
Single Output, High Reliability, 2" x 2", 14-20 Watt, DC/DC Converters
MDC_UWR14-20 Series.G01 Page 3 of 6
