Figure 1. Simplifi ed Schematic
DATEL's new A-Series switching DC/DC converters are designed to meet the demanding long-
term-reliability and low-cost requirements of modern telecom,
datacom, computer/networking and industrial-electronics applications. These highly-effi cient, rugged
devices combine straightforward circuit topologies, new components, proven SMT-on-pcb construc-
tion methods, and highly repeatable automatic-assembly techniques. The fl exibility of the designs and
their assembly methods readily permit
minor modifi cations to optimize performance for specifi c applications.
The single-output, 14-20 Watt Models of the A-Series deliver both high power densities and
impressive MTBF’s.
Packaged in standard, 2" x 2" x 0.45", shielded metal cases with non-conductive coatings, these
fully isolated (1500Vdc minimum) DC/DC’s offer excellent line/load regulation, full I/O protection,
thermal shutdown, and industry-standard pinouts.
Output voltages include 3.3, 5, 5.2, 12 or 15 Volts. Input voltage ranges are DATEL's traditional
ultra-wide 9-36V and 18-75V, as well as 4.7-7.5V. Each device provides remote on/off control and
VOUT trim capability. All A-Series UWR models are fully EMI characterized and designed to meet
UL1950, CSA 950 and IEC 950 safety.
A-Series DC/DC’s are extremely reliable, easy-to-use, cost-effective power converters. Use them
to improve the reliability of existing equipment or to develop
new systems that exceed design objectives.
COMMON
+V
OUT
+V
(1)
(2)
(4)
(6)
(7)
(8)
IN
–V
IN
ON/OFF
CONTROL
+V
OUT
TRIM
REFERENCE &
ERROR AMP
OPTO
ISOLATION
PWM
CONTROLLER
Typical topology is shown.
Typical units
PRODUCT OVERVIEWFEATURES
Low cost! Highly reliable!
Proven SMT-on-pcb construction
Designed to meet UL/ EN60950,
BASIC insulation (D48A models)
mark available (48VIN models)
Output voltages: 3.3/5/5.2/12/15 Volts
Ultra-wide input voltage ranges:4.7-7.5V, 9-36V
or 18-75V
Small packages, 2" x 2" x 0.45"
Industry-standard pinouts
Fully isolated, 1500Vdc guaranteed
Guaranteed effi ciencies to 84%
–40 to +100°C operating temperature
Modifi cations and customs for OEM’s
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For full details go to
www.murata-ps.com/rohs
UWR Series
Single Output, High Reliability, 2" x 2", 14-20 Watt, DC/DC Converters
MDC_UWR14-20 Series.C03 Page 1 of 6
Notes:
For "D5A" and "D12A" models, the
case is connected to pin 2 (–VIN).
For "D48A" and "D48E" models, the
case is connected to pin 1 (+VIN).
1. UWR-3.3/4850-D48A (18-75V input, curve A) and UWR-3.3/4850-D12A (9-36V input, curve A)
will derate curve AA if used over the limited input ranges of 20-60V or 10-30V, respectively.
2. "D48A" models (18-75V input ranges) that derate along curve B will derate along curve BB
if used over the more limited input range of 24-60V.
Wide Range Input
Output Confi guration:
U = Unipolar
Nominal Output Voltage:
3.3, 5, 12 or 15 Volts
Maximum Output Current
in mA
Input Voltage Range:
D5 = 4.7-7.5 Volts (5V nominal)
D12 = 9-36 Volts (24V nominal)
D48 = 18-75/36-72 Volts (48V nominal)
A-Series
High Reliability
5U WR 4000 D12 A-/-
BOTTOM VIEW
1.800
(45.72)
0.10
(2.54)
2.00
(50.80)
8
5
6
7
0.40
(10.16)
0.200
(5.08)
0.400
(10.16)
0.100
(2.54)
1
2
3
4
METAL CASE
INSULATED BAS
E
0.040 ±0.002 DIA.
(1.016 ±0.051)
2.00
(50.80)
0.20 MIN
(5.08)
0.45
(11.43)
1.200
(30.48)
3 EQ. SP. @
0.400 (10.16)
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions unless otherwise
noted.
➁ Ripple/Noise (R/N) measured over a 20MHz bandwidth.
➂ 10% to 100% load.
UWR-3.3/4250-D5A 3.3 4250 50 100 ±1.0% ±1.0% 5 4.7-7.5 80/3720 76% 77% C4, P6
UWR-3.3/4850-D12A 3.3 4850 50 75 ±0.5% ±1.0% 24 9-36 35/852 77% 79% C4, P6
UWR-3.3/4850-D48A 3.3 4850 50 100 ±1.0% ±1.0% 48 18-75 15/419 79% 80% C4, P6
UWR-5/3000-D5A 5 3000 50 100 ±1.0% ±1.0% 5 4.7-7.5 80/3800 78% 79% C4, P6
UWR-5/4000-D12A 5 4000 50 100 ±0.3% ±0.5% 24 9-36 15/1020 81% 82% C4, P6
UWR-5/4000-D48A 5 4000 50 100 ±0.3% ±0.5% 48 18-75 15/496 82% 84% C4, P6
UWR-5/4000-D48E ➄ 5 4000 50 100 ±0.3% ±0.5% 48 36-72 15/484 84% 86% C4, P6
UWR-5.2/3000-D5A 5.2 3000 50 100 ±1.0% ±1.0% 5 4.7-7.5 80/3900 79% 80% C4, P6
UWR-12/1250-D5A 12 1250 75 120 ±1.0% ±1.0% 5 4.7-7.5 80/3660 80% 82% C4, P6
UWR-12/1650-D12A 12 1650 50 100 ±0.3% ±0.5% 24 9-36 15/1000 79.5% 82.5% C4, P6
UWR-12/1650-D48A 12 1650 75 100 ±0.3% ±0.5% 48 18-75 15/491 84% 85% C4, P6
UWR-15/1000-D5A 15 1000 75 150 ±1.0% ±1.0% 5 4.7-7.5 80/3660 80% 82% C4, P6
UWR-15/1300-D12A 15 1300 50 100 ±0.3% ±0.5% 24 9-36 20/967 84% 85% C4, P6
UWR-15/1300-D48A 15 1300 75 100 ±0.3% ±0.5% 48 18-75 10/484 84% 86% C4, P6
Performance Specifi cations and Ordering Guide
IOUT
(mA)
R/N (mVp-p) ➁
Load ➂
VOUT
(Volts)
Output
Package
(Case,
Pinout)
Effi ciency
Regulation (Max.)
Line
VIN Nom.
(Volts)
Range
(Volts)Root Model ➅
Input
IIN ➃
(mA)
➀
Max.
Typ. Typ.
Min.
➃ Nominal line voltage, no-load/full-load conditions.
➄ See Technical Notes for an explanation of trading off input voltage ranges for higher full-power
operating temperature.
➅ These are not complete part numbers. Please see the Part Number Structure.
Part Number Structure
Mechanical Specifi cations
Temperature Derating
Output Power (Watts)
Ambient Temperature (°C)
20
18
16
14
12
10
8
6
4
2
0
UWR-3.3/4250-D5A F
UWR-3.3/4850-D12A A
UWR-3.3/4850-D48A A
UWR-5/3000-D5A E
UWR-5/4000-D12A C
UWR-5/4000-D48A B
UWR-5/4000-D48E G
UWR-5.2/3000-D5A D
UWR-12/1250-D5A E
UWR-12/1650-D12A C
UWR-12/1650-D48A B
UWR-15/1000-D5A E
UWR-15/1300-D12A C
UWR-15/1300-D48A B
–40 0 40 45 50 55 60 65 70 75 80 85 90 95 10
0
A
AA
BB, G
C
F
ED
D, E, F
B
BB G
Case C4
I/O Connections
Pin Function P6
1 +Input
2 –Input
3 Pin not installed
4 On/Off Control
5 Pin not installed
6 +Output
7 Common
8 Trim
RoHS-6 hazardous sub-
stance compliant*
C
* Contact Murata Power Solutions
(Datel) for availability.
-
Third Angle Projection
Dimensions are in inches (mm) shown for ref. only.
Components are shown for reference only.
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
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UWR Series
Single Output, High Reliability, 2" x 2", 14-20 Watt, DC/DC Converters
MDC_UWR14-20 Series.C03 Page 2 of 6
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 DATEL 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 (–VIN)
D48A, D48E Models Pin 1 (+VIN)
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.C03 Page 3 of 6
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. For DATEL A-Series
UWR 14-20 Watt DC/DC Converters, you should use slow-blow type fuses
with values no greater than the following:
VIN Range Fuse Value
D5A 6A
D12A 4A
D48A/D48E 2A
On/Off Control
The On/Off Control pin (pin 4) may be used for remote on/off operation. A
TTL logic high (+2 to +5 Volts, 250µA max.) applied to pin 4 disables the
converter. A TTL logic low (0 to +0.8 Volts, 70µA max.), or no connection,
enables the converter. Control voltages should be referenced to pin 2
(–Input). Applying a voltage to the Control pin when no input power is
applied to the converter can cause permanent damage to the converter.
Output Trimming
VOUT may be trimmed up +5% only via a single external trimpot or fi xed
resistor. The trimpot should be connected as shown in Figure 2a with its
wiper connected to pin 8 (Trim). A trimpot can be used to determine the
value of a single fi xed resistor which should be connected as shown in
Figure 2b. Connect the resistor between pins 8 and 7 (Common) to trim
"up" the output voltage. Fixed resistors should be metal-fi lm types with
absolute TCR’s less than 100ppm/°C to ensure stability.
Figure 2a. Trim Connections Using a Trimpot
Figure 2b. Trim Connections Using Fixed Resistors
Custom Capabilities
DATEL’s world-class design, development and manufacturing team stands
ready to work with you to deliver the exact power converter you need for
your demanding, large volume, OEM applications. More importantly . . .
we’ll do it on time and within budget!
Our experienced applications and design staffs; quick-turn prototype
capability; highly automated, SMT assembly facilities; and in-line SPC
quality-control techniques combine to give us the unique ability to design
and deliver any quantity of power converters to the highest standards of
quality and reliability.
We have compiled a large library of DC/DC designs that are currently used
in a variety of telecom, medical, computer, railway, aerospace and industrial
applications. We may already have the converter you need.
Contact us. Our goal is to provide you the highest-quality, most cost-effec-
tive power converters available.
1
2
7
8
6
+VIN
–VIN
+VOUT
COMMON
TRIM LOAD
20kΩ
5-10
TURNS
1
2
7
8
6
+VIN
–VIN
+VOUT
COMMON
TRIM
Trim Up
LOAD
Soldering Guidelines
Murata Power Solutions recommends the specifi cations below when installing these
converters. These specifi cations vary depending on the solder type. Exceeding these
specifi cations may cause damage to the product. Your production environment may dif-
fer; therefore please thoroughly review these guidelines with your process engineers.
Wave Solder Operations for through-hole mounted products
(THMT)
For Sn/Ag/Cu based solders:
Maximum Preheat Temperature 115° C.
Maximum Pot Temperature 270° C.
Maximum Solder Dwell Time 7 seconds
For Sn/Pb based solders:
Maximum Preheat Temperature 105° C.
Maximum Pot Temperature 250° C.
Maximum Solder Dwell Time 6 seconds
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UWR Series
Single Output, High Reliability, 2" x 2", 14-20 Watt, DC/DC Converters
MDC_UWR14-20 Series.C03 Page 4 of 6
If you’re designing with EMC in mind, please note that all of DATEL’s UWR
14-20 Watt A-Series DC/DC Converters have been characterized for radi-
ated and conducted emissions in our new EMI/EMC laboratory. Testing is
conducted in an EMCO 5305 GTEM test cell utilizing EMCO automated EMC
test software. Radiated emissions are tested to the limits of FCC Part 15,
Class B and CISPR 22 (EN 55022), Class B. Radiated emissions plots to FCC
and CISPR 22 for model UWR-5/4000-D12A appear below.
Typical Performance Curves (TA = +25°C)
The performance curves below were derived from actual test data for a
single model number (UWR-5/4000-D12A). Since all devices in the 14-20W
UWR A-Series have the same circuit topology, the performance curves are
representative of all devices.
Effi ciency vs. Output Current and Input Voltage
Output Voltage vs. Input Voltage and Output Current
Output Voltage vs. Output Current and Input Voltage
EFFICIENCY
EMI RADIATED EMISSIONS
LINE REGULATION
LOAD REGULATION
87
84
81
78
75
72
69
66
63
Efficiency (%)
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
5V Output Current (Amps)
V
IN
= 36V
V
IN
= 24V
V
IN
= 12V
5.015
5.010
5.005
5.000
4.995
4.990
4.985
4.980
4.975
V
OUT
(Volts)
9 12 15 18 21 24 27 30 33 3
6
VIN (Volts)
I
OUT
= 4A
I
OUT
= 2A
I
OUT
= 1A
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
5V Output Current (Amps)
V
IN
= 36V V
IN
= 24V
V
IN
= 12V
5.015
5.010
5.005
5.000
4.995
4.990
4.985
4.980
4.975
V
OUT
(Volts)
80
70
60
50
40
30
20
10
0
–10
–20
Fre
q
uenc
y
(
MHz
)
100 1000
Radiated Emissions
FCC Class B Limit
UWR-5/4000-D12A Radiated Emissions
FCC Part 15 Class B, 3 Meters
Converter Output = 5Vdc @ 3.6A
Radiated Emissions (dBμV/M)
UWR-5/4000-D12A Radiated Emissions
EN 55022 Class B, 10 Meters
Converter Output = +5Vdc @ 3.6A
80
70
60
50
40
30
20
10
0
–10
–20
Frequency (MHz)
100 1000
Radiated Emissions
EN 55022 Class B Limit
Radiated Emissions (dBμV/M)
Quality and Reliability
The A-Series are the fi rst DC/DC Converters to emerge from DATEL’s new,
company-wide approach to designing and manufacturing the most reliable
power converters available. The fi ve-pronged program draws our Quality
Assurance function into all aspects of new-product design, development,
characterization, qualifi cation and manufacturing.
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UWR Series
Single Output, High Reliability, 2" x 2", 14-20 Watt, DC/DC Converters
MDC_UWR14-20 Series.C03 Page 5 of 6
Design for Reliability
Design for Reliability is woven throughout our multi-phased, new-product-
development process. Design-for-reliability practices are fully documented
and begin early in the new-product development cycle with the following
goals:
1. To work from an approved components/vendors list ensuring the use of
reliable components and the rigorous qualifi cation of new components.
2. To design with safety margins by adhering to a strict set of derating
guidelines and performing theoretical worst-case analyses.
3. To locate potential design weaknesses early in the product-development
cycle by using extensive HALT (Highly Accelerated Life Testing).
4. To prove that early design improvements are effective by employing a
thorough FRACA (Failure Reporting Analysis and Corrective Action)
system.
HALT Testing
The goal of the accelerated-stress techniques used by DATEL is to force
device maturity, in a short period of time, by exposing devices to excessive
levels of "every stimulus of potential value." We use HALT (Highly Acceler-
ated Life Testing) repeatedly during the design and early manufacturing
phases to detect potential electrical and mechanical design weaknesses
that could result in possible future fi eld failures.
During HALT, prototype and pre-production DC/DC converters are sub-
jected to progressively higher stress levels induced by thermal cycling,
rate of temperature change, vibration, power cycling, product-specifi c
stresses (such as dc voltage variation) and combined environments. The
stresses are not meant to simulate fi eld environments but to expose any
weaknesses in a product’s electro/mechanical design and/or assembly
processes. The goal of HALT is to make products fail so that device weak-
nesses can be analyzed and strengthened as appropriate. Applied stresses
are continually stepped up until products eventually fail. After corrective
actions and/or design changes, stresses are stepped up again and the cycle
is repeated until the "fundamental limit of the technology" is determined.
DATEL has invested in a Qualmark OVS-1 HALT tester capable of applying
voltage and temperature extremes as well as 6-axis, linear and rota-
tional, random vibration. A typical HALT profi le (shown above) consists of
thermal cycling (–55 to +125°C, 30°C/minute) and simultaneous, gradually
increasing, random longitudinal and rotational vibration up to 20G’s with
load cycling and applied-voltage extremes added as desired. Many devices
in DATEL’s new A-Series could not be made to fail prior to reaching either
the limits of the HALT chamber or some previously known physical limit of
the device. We also use the HALT chamber and its ability to rapidly cool
devices to verify their "cold-start" capabilities.
Qualifi cation
For each new product, electrical performance is verifi ed via a comprehensive
characterization process and long-term reliability is confi rmed via a rigorous
qualifi cation procedure. The qual procedure includes such strenuous tests as
thermal shock and 500 hour life. Qual testing is summarized below.
In-Line Process Controls and Screening
A combination of statistical sampling and 100% inspection techniques
keeps our assembly line under constant control. Parameters such as
solder-paste thickness, component placement, cleanliness, etc. are statisti-
cally sampled, charted and fi ne tuned as necessary. Visual inspections are
performed by trained operators after pick-and-place, soldering and cleaning
operations. Units are 100% electrically tested prior to potting. All devices
are temperature cycled, burned-in, hi-pot tested and fi nal-electrical tested
prior to external visual examination, packing and shipping.
Rapid Response to Problems
DATEL employs an outstanding corrective-action system to immediately
address any detected shortcomings in either products or processes. When-
ever our assembly, quality or engineering personnel spot a product/process
problem, or if a product is returned with a potential defect, we immediately
perform a detailed failure analysis and, if necessary, undertake corrective
actions. Over time, this system has helped refi ne our assembly operation to
yield one of the lowest product defect rates in the industry.
Typical HALT Profi le
Qualifi cation Test Method/Comments
HALT DATEL in-house procedure
High Temperature Storage Max. rated temp., 1,000 hours
Thermal Shock 10 cycles, –55 to +125°C
Temperature/Humidity +85°C, 85% humidity, 48 hours
Lead Integrity DATEL in-house procedure
Life Test +70°C, 500 hours*
Marking Permanency DATEL in-house procedure
End Point Electrical Tests Per product specifi cation
Qualifi cation Testing
* Interim electrical test at 200 hours.
10 20 30 40 50 60 70 80 90
40
20
0
Random Vibration (G's)
Temperature (°C)
Test Time (minutes)
100
80
60
40
20
0
–20
–40
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Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without
notice. © 2012 Murata Power Solutions, Inc.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
UWR Series
Single Output, High Reliability, 2" x 2", 14-20 Watt, DC/DC Converters
MDC_UWR14-20 Series.C03 Page 6 of 6
