www.murata-ps.com
PRODUCT OVERVIEW
Rarely has a Series of low-power DC/DC con-
verters been defined by both low cost and DATEL's
made-in-the-USA quality and reliability. Our new
UST Series of single-output DC/DC’s achieves this
best-of-both-worlds status by implementing a
proven circuit architecture (170-200kHz flyback
design) as a full, SMT-on-pcb assembly (including
surface-mount magnetics) that is truly 100% auto-
matically assembled. Packaged in miniature 1.25"
x 0.8", DIP-like plastic packages (UL94V-0 rated)
and requiring no external components, UST Series
DC/DC’s bring true component-like convenience to
designers of today’s distributed power systems.
Output voltages are 5, 12 or 15 Volts. Input
voltage ranges are 4.5-9V ("D5" models), 9-18V
("D12" models) or an ultra-wide 18-72V ("D48"
models). UST DC/DC’s are fully isolated (1000Vdc
guaranteed) and include input (pi type) and output
filters within their package. Output transient
UST Models
3W, Single Output DC/DC Converters
FEATURES
Lowest cost! Highest reliability!
100% SMT-on-pcb, including magnetics
100% automatically assembled
Standard "DIP" package and pinouts
Fully isolated, 1000Vdc guaranteed
5, 12 or 15 Volt outputs
Choice of 3 wide-range inputs:
4.5-9 Volts
9-18 Volts
18-72 Volts
Guaranteed efficiencies to 73%
–40 to +75°C full-power operation
Internal input/output filtering
UL1950/C22.2 No. 950/IEC950 certified
Modifications and customs for OEM’s
response is a quick 200µsec, while output ripple
and noise are typically 75mVp-p.
These rugged modules are fully encapsulated
with a thermally conductive potting compound that
contributes to their outstanding moisture/vibration
resistance and impressive MTBF. They operate over
the full –40 to +75°C temperature range without
derating. All models have been thoroughly charac-
terized (electrically, mechanically and thermally),
qualified (including HALT), and EMI/EMC tested.
Additionally, they are certified to UL1950, CSA 22.2
No. 950 and IEC950.
DATEL’s UST Model 3W DC/DC’s are excellent
selections for telecom/datacom, computer and
process-control applications demanding small size,
low cost and high reliability. If required, their design
"flexibility" allows for easy modification to your
application-specific requirements.
+V
IN
+V
OUT
COMMON
–V
IN
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
Figure 1. Simplified Block Diagram
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
email: sales@murata-ps.com
03 Dec 2009 MDC_UST_3W_B02
Page 1 of 4
UST Models
Performance Specifications and Ordering Guide
Output
Model
➄
UST-5/500-D5
UST-5/500-D12
UST-5/500-D48
UST-12/250-D5
UST-12/250-D12
UST-12/250-D48
UST-15/200-D5
UST-15/200-D12
UST-15/200-D48
➀
➁
➂
➃
➄
➀
3W, Single Output DC/DC Converters
Input
Package
(Case,
Pinout)
C1, P1
C1, P1
C1, P1
C1, P1
C1, P1
C1, P1
C1, P1
C1, P1
C1, P1
V
OUT
(Volts)
5
5
5
12
12
12
15
15
15
I
OUT
(mA, Max.)
500
500
500
250
250
250
200
200
200
R/N (mVp-p)
➁
Typ.
Max.
75
75
75
75
75
75
75
75
75
120
120
120
150
150
150
150
150
150
Regulation (Max.)
➂
Line
Load
±0.2%
±0.2%
±0.2%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
±0.5%
V
IN
Nom.
(Volts)
5
12
48
5
12
48
5
12
48
Range
(Volts)
4.5-9
9-18
18-72
4.5-9
9-18
18-72
4.5-9
9-18
18-72
I
IN
➃
(mA)
18/676
25/282
7/69
30/800
25/338
8/81
30/800
25/333
8/81
Efficiency
Min.
Typ.
72%
70%
71%
73%
72%
73%
73%
73%
73%
74%
74%
75%
75%
74%
77%
75%
75%
77%
Typical at T
A
= +25°C under nominal line voltage and full-load conditions unless otherwise noted.
Ripple/Noise (R/N) measured over a 20MHz bandwidth.
10% to 100% load.
Nominal line voltage, no-load/full-load conditions.
These are not complete model numbers. Please refer to the part number structure when ordering.
MECHANICAL SPECIFICATIONS
1.25
(31.75)
PART NUMBER STRUCTURE
U ST
-
5
/
500
-
D48
-
C
Output Configuration:
U
= Unipolar
Product Series
Nominal Output Voltage:
5, 12 or 15 Volts
Maximum Output Current
in mA
RoHS-6
compliant*
Input Voltage Range:
D5
= 4.5-9 Volts (5V nominal)
D12
= 9-18 Volts (12V nominal)
D48
= 18-72 Volts (48V nominal)
0.45
(11.43)
STANDOFFS
0.025
(0.64)
Case C1
0.020 ±0.002 DIA.
(0.508 ±0.051)
0.600
(15.24)
0.15 MIN
(3.81)
0.200
(5.08)
0.100
(2.54)
0.18
(4.57)
*
Contact Murata Power Solutions
for availability.
TEMPERATURE DERATING
3 4
7
8
0.600
(15.24)
1 2
5
6
0.80
(20.32)
Output Power vs. Ambient Temperature
V
IN
Nominal, Natural Convection
3.5
3
BOTTOM VIEW
PLASTIC CASE WITH AN INSULATED BASE
0.10
(2.54)
Output Power (Watts)
2.5
DIMENSIONS ARE IN INCHES (MM)
2
1.5
I/O Connections
Pin
1
2
3
4
5
6
7
8
Function P1
+Input
+Input
–Input
–Input
Common
+Output
Common
+Output
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
1
0.5
0
–40
0
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95 100
Ambient Temperature (
˚
C)
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 2˚
Components are shown for reference only.
www.murata-ps.com
email: sales@murata-ps.com
03 Dec 2009 MDC_UST_3W_B02
Page 2 of 4
UST Models
3W, Single Output DC/DC Converters
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions, unless noted.
➀
Input
Input Voltage Range:
"D5" Models
"D12" Models
"D48" Models
Input Current
Input Filter Type
➁
Reverse-Polarity Protection
V
OUT
Accuracy
(50% load)
Temperature Coefficient
Ripple/Noise
(20MHz BW)
➁
Line/Load Regulation
Efficiency
Isolation Voltage
➂
Short Circuit Protection:
➃
"D5" Models
"D12" and "D48" Models
Transient Response
(50% load step)
Switching Frequency:
"D48" Models
"D5" and "D12" Models
Operating Temperature
(Ambient, no derating)
Storage Temperature
Dimensions
Case Material
Pin Material
Weight
4.5-9 Volts (5V nominal)
9-18 Volts (12V nominal)
18-72 Volts (48V nominal)
See Ordering Guide
Pi
Yes (Instantaneous, 2A maximum)
Input Voltage:
"D5" Models
"D12" Models
"D48" Models
Absolute Maximum Ratings
12 Volts
20 Volts
80 Volts
Current must be <2A. Brief duration
only. Fusing recommended.
None
Maximum current and short-circuit
duration are model dependent. "D12"
and "D48" models can withstand
sustained output short circuits.
–55 to +100°C
+280°C
Input Reverse-Polarity Protection
Output Overvoltage Protection
Output Current
Output
±1%, maximum
±0.02% per °C
See Ordering Guide
See Ordering Guide
See Ordering Guide
1000Vdc, minimum
Power-limiting technique, auto-recovery
Hiccup technique, auto-recovery
200µsec to ±1.5% of final value
200kHz
170kHz
Storage Temperature
Lead Temperature
(soldering, 10 sec.)
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 Specifications Table is not implied.
Dynamic Characteristics
TECHNICAL NOTES
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 UST 3 Watt DC/DC Converters achieve their rated ripple and noise
specifications without the use of external input/output capacitors. In criti-
cal 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
"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
Environmental
–40 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 w/nickel underplate
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 for quantity orders
and perhaps added internally upon request. Contact DATEL Applications Engineering for
details.
➂
Devices can be screened for quantity orders or modified for higher guaranteed isolation
voltages. Contact DATEL Applications Engineering for details.
➃
The current limit inception point is dependent on the input voltage. Therefore, it is possible
to draw current beyond the rated capacity. Users should fully characterize their load condi-
tions.
In critical, space-sensitive applications, DATEL may be able to tailor the in-
ternal input/output filtering of these units to meet your specific requirements.
Contact our Applications Engineering Group for additional details.
www.murata-ps.com
email: sales@murata-ps.com
03 Dec 2009 MDC_UST_3W_B02
Page 3 of 4
UST Models
3W, Single Output DC/DC Converters
Input Fusing
Certain applications and/or safety agencies may require the installation
of fuses at the inputs of power conversion components. For DATEL UST 3
Watt DC/DC Converters, you should use fast-blow type fuses with values
no greater than the following:
V
IN
Range
"D5"
"D12"
"D48"
Fuse Value
1.5A
1A
0.5A
EMI RADIATED EMISSIONS
If you’re designing with EMC in mind, please note that all of DATEL’s
UST 3 Watt DC/DC Converters have been characterized for radiated 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. Correlation to other specifications
can be supplied upon request. Radiated emissions plots to FCC and CISPR
22 for model UST-5/500-D48 appear below.
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. And ... 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 indus-
trial applications. We may already have the converter you need.
Contact us. Our goal is to provide you the highest-quality, most cost-
effective power converters available.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
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. Specifications are subject to change without
notice.
© 2009 Murata Power Solutions, Inc.
www.murata-ps.com/locations
03 Dec 2009
email: sales@murata-ps.com
MDC_UST_3W_B02
Page 4 of 4
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