TWR A-Series
12-15W, Triple Output DC/DC Converters
Featuring Murata Power Solutions' ultra-wide, 18-72V, input voltage
range, this Family of A-Series, TWR (triple-output) DC/DC converters
deliver up to 15 Watts.
PRODUCT OVERVIEW
These devices each have a primary +5V output
that can source from 1 Amp to 1.5 Amps (model
dependent) and auxiliary ±12/15V outputs that can
source from ±150 to ±250mA (model dependent).
All models can simultaneously source maximum
rated current from both primary and auxiliary
outputs. The nominal input voltage for each model
is 48V.
As members of Murata Power Solutions’ new
A-Series, the 12-15W triples exhibit both low cost
and outstanding long-term reliability. Their design
combines straightforward circuit topologies, proven
SMT-on-pcb construction methods, the newest
components, and highly repeatable automatic-
assembly techniques. The A-Series TWR’s superior
durability is substantiated by a rigorous in-house
qualification program that includes HALT (Highly-
Accelerated Life Testing), which is designed to
detect any potential electrical, mechanical or proc-
ess weakness.
Packaged in standard, 2" x 2" x 0.45", shielded
metal cases with non-conductive coatings, these
fully isolated (1000Vdc minimum) DC/DC’s offer
excellent line and load regulation. Additionally,
these A-Series triples have non-latching output
current limiting, input overvoltage shutdown, input
reverse-polarity protection, and output overvoltage
clamping to protect both the power converters and
their loads. All A-Series TWR models are fully EMI
characterized and designed to meet UL1950, IEC
950, CSA 950 and EN60950.
FEATURES
Low cost! Highly Reliable!
Output voltages: +5V/±12V or +5V/±15V
Ultra-wide, 18-72V, input voltage ranges
Small, 2" x 2" x 0.45" packages
Guaranteed efficiencies to 80%
Fully isolated, 1500Vdc guaranteed
–40 to +100°C operating temperature
Proven SMT-on-pcb construction
Shielded (5-side) metal cases with insulated baseplates
Designed to meet UL 1950 and EN60950
Qual Tested; HALT tested; EMC tested
Modifications and customs for OEM's
+
V
IN
(1)
+5V
(6)
SIMPLIFIED SCHEMATIC
–
V
IN
(2)
PWM
CONTROLLER
–12V (–15V)
(8)
+12V (+15V)
(5)
COMMON
(7)
OPTO
FEEDBACK
ERROR
AMPLIFIER
Typical topography is shown.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_TWR12-15.B01
Page 1 of 5
TWR A-Series
12-15W, Triple Output DC/DC Converters
PERFORMANCE SPECIFICATIONS AND ORDERING GUIDE
1
V
OUT
(V)
±5
±12
±5
±12
±5
±15
±5
±15
Model
TWR-5/1200-12/250-D48A
TWR-5/1500-12/250-D48A
TWR-5/1000-15/250-D48A
TWR-5/1500-15/250-D48A
I
OUT
2
(mA)
1200
±250
1500
±250
1000
±250
1500
±250
Output
R/N (mVp-p)
3
Typ.
Max.
50
75
50
75
50
75
50
75
100
175
100
175
100
175
100
175
Input
Regulation (Max.)
Line
Load
4
±1%
±5%
±1%
±5%
±1%
±5%
±1%
±5%
±1%
±5%
±1%
±5%
±1%
±5%
±1%
±5%
V
IN
Nom.
(Volts)
48
48
48
48
Range
(Volts)
18-72
18-72
18-72
18-72
I
IN
5
(mA)
50/340
50/388
50/354
50/425
Efficiency
Min.
79%
78%
79%
79%
Typ.
81%
79%
80%
81%
Package
(Case/
Pinout)
C4, P8
C4, P8
C4, P8
C4, P8
1
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions unless otherwise noted.
3
For the +5V output, listed spec applies over the 10% to 100% load range. For the ±12V and ±15V
outputs, listed spec applies for balanced loads over the 20% to 100% load range.
2
Ripple/Noise (R/N) measured over a 20MHz bandwidth, specified with 0.2μF ceramic output capaci-
tors.
4
Nominal line voltage, no-load/full-load conditions.
PART NUMBER STRUCTURE
MECHANICAL SPECIFICATIONS
2.00
(50.80)
ME T A L C A S E
T WR
-
5
/
1000
-
15
/
250
-
D48 A
-
C
Output
Configuration:
T
= Triple
Wide Range Input
Nominal Primary Output:
Voltage (+5V)
Maximum Primary Output
Current in mA
RoHS-6 Compliant*
A Series
High Reliability
Input Voltage Range:
D48
= 18-72V (48V nominal)
Maximum Auxilliary Output:
Currents in mA from each output
* Contact Murata Power
Solutions Technologies for
availability.
0.200
(5.08)
0.45
(11.43)
Case C4
IN S U LA T E D B A S E
0.20 MIN
(5.08)
0.040 ±0.002 D IA .
(1.016 ±0.051)
1.800
(45.72)
0.10
(2.54)
Nominal Auxiliary Output:
Voltages (±12 or ±15V)
5
6
1
2
7
0.500 (12.7)
TEMPERATURE DERATING
20
19
18
17
16
15
1.200
(30.48)
3 E Q . SP. @
0.400 ( 10.16)
2.00
(50.80)
8
0.40
(10.16)
B O T T O M V IE W
Output Power (Watts)
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
–40
0
40
45
50
55
60
65
70
75
80
85
90
95
100
Note:
The case is connected to pin 1 (+V
IN
).
INPUT/OUTPUT CONNECTIONS
Pin
1
2
3
4
5
6
7
8
Function P8
+Input
-Input
No Pin
No Pin
+12V/15V Output
+5V Output
Common
-12V/15V Output
Dimensions are in inches (mm)
Ambient Temperature (°C)
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_TWR12-15.B01
Page 2 of 5
TWR A-Series
12-15W, Triple Output DC/DC Converters
Performance/Functional Specifications
Typical @ T
A
= +25°C under nominal line voltage and full-load conditions, unless noted.
Input
Input Voltage Range
Input Current
Input Filter Type
Reverse-Polarity Protection
18-72 Volts (48V nominal)
See Ordering Guide
Pi
Yes (Instantaneous, 6A maximum)
Absolute Maximum Ratings
Input Voltage:
Input Reverse-Polarity Protection
Output Overvoltage Protection
+5V Output
±12V Outputs
±1%
±3%
±0.02% per °C
See Ordering Guide
See Ordering Guide
See Ordering Guide
1500Vdc, minimum
680pF
Auto-recovery
Zener/transorb clamps, magnetic feed
back
200μsec max. to ±2% of final value
165kHz (±15kHz)
T E C H N I C A L
N O T E S
80 Volts
Current must be <6A. Brief
duration only. Fusing recommended.
6.8 Volts, limited duration
±13 Volts, limited duration
±16 Volts, limited duration
Current limited.
Max. current and
Output
V
OUT
Accuracy
(50% loads):
+5V Output
±12V or ±15V Outputs
Temperature Coefficient
Ripple/Noise
(20MHz BW)
Line/Load Regulation
Efficiency
Isolation Voltage
Isolation Capacitance
Current Limiting
Overvoltage Protection
±15V Outputs
Output Current
short-circuit duration are model
dependent
Storage Temperature
Lead Temperature
(soldering, 10 sec.)
–40 to +105°C
+300°C
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 Specifications Table is not implied.
Dynamic Characteristics
Transient Response
(50% load step)
Switching Frequency
Environmental
Operating Temperature
(ambient):
Without Derating
With Derating
Storage Temperature
–40 to +50-70°C (Model dependent)
to +100°C (See Derating Curve)
–40 to +105°C
2" x 2" x 0.45" (51 x 51 x 11.4mm)
5-sided
Pin 1 (+V
IN
)
Corrosion resistant steel with
non-conductive, epoxy-based, black
enamel finish and plastic baseplate
Gold plate copper alloy with
nickel underplate
2.6 ounces (74 grams)
Filtering and Noise Reduction
All TWR A-Series 12-15 Watt DC/DC Converters achieve their rated ripple
and noise specifications without the use of external input/output capacitors.
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. Output
capacitors should be connected between their respective output pin (pin 5, 6
or 8) and Common (pin 7) as shown in Figure 2. 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
To Reduce Output Ripple
+5V Output
±12/15V Outputs
10μF, 100V
47μF, 10V, Low ESR
22μF, 20V, Low ESR
Physical
Dimensions
Shielding
Case Connection
Case Material
Pin Material
Weight
These power converters require a minimum 10% loading on their primary output and a
minimum 20% loading on their auxiliary outputs to maintain specified regulation. Opera-
tion under no-load conditions will not damage these devices; however they may not meet
all listed specifications.
Application-specific internal input/output filtering can be recommended and perhaps
added internally upon request. Contact Murato Power Solutions Applications Engineering
for details.
Devices can be screened or modified for higher guaranteed isolation voltages.
Contact Murato Power Solutions Applications Engineering for details.
In critical, space-sensitive applications, Murata Power Solutions may be able
to tailor the internal input/output filtering of these units to meet your specific
requirements. Contact our Applications Engineering Group for additional
details.
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_TWR12-15.B01
Page 3 of 5
TWR A-Series
12-15W, Triple Output DC/DC Converters
TWR-5/1500-15/250-D48A Radiated Emissions
FCC Part 15 Class B 3 Meters
Converter Output = +5Vdc @ 1.35A and ±15Vdc @ 225mA
+
1
+INPUT
+
C
IN
2
–INPUT
8
–12/15V
COMMON
+
C
OUT
7
+5V
Radiated Emissions (dBμV/M)
80
+12/15V
5
C
OUT
6
+
C
OUT
70
60
FCC Class B Limit
50
40
30
20
10
0
Figure 2. Using External Capacitors
to Reduce Input/Output Ripple/Noise
Radiated Emissions
–10
–20
100
1000
Frequency (MHz)
Input Fusing
Certain applications and/or safety agencies may require the installation of
fuses at the inputs of power conversion components. For Murata Power Solu-
tions A-Series TWR 12-15 Watt DC/DC Converters, you should use slow-blow
type fuses with values no greater than 2A.
C U S T O M
C A P A B I L I T I E S
Radiated Emissions (dBμV/M)
TWR-5/1500-15/250-D48A Radiated Emissions
EN55022 Class B 10 Meters
Converter Output = +5Vdc @ 1.35A and ±15Vdc @ 225mA
80
70
60
Murata Power Solutions’ world-class design, development and manufactur-
ing 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 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.
E M I R A D I AT E D E M I S S I O N S
50
EN 55022 Class B Limit
40
30
20
10
0
Radiated Emissions
–10
–20
100
1000
Frequency (MHz)
Quality and Reliability
The A-Series are the first DC/DC Converters to emerge from Murata Power
Solutions’ new, company-wide approach to designing and manufacturing
the most reliable power converters available. The five-pronged program
draws our Quality Assurance function into all aspects of new-product design,
development, characterization, qualification and manufacturing.
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 qualification of new components.
2. To design with safety margins by adhering to a strict set of derating guide-
lines 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).
If you’re designing with EMC in mind, please note that all of Murata Power
Solutions’ TWR A-Series 12-15 Watt DC/DC Converters have been charac-
terized for radiated and conducted emissions in our new EMI/EMC laboratory.
Testing is conducted in an EMCO 5305 GTEM test cell utilizing EMCO auto-
mated 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 TWR-5/1500-15/250-D48A appear below. Pub-
lished EMC test reports are available for each model number. Contact Murata
Power Solutions’ Applications Engineering Department for more details.
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_TWR12-15.B01
Page 4 of 5
TWR A-Series
12-15W, Triple Output DC/DC Converters
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 Murata Power Solu-
tions 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 Accelerated Life Testing) repeatedly during the design and early
manufacturing phases to detect potential electrical and mechanical design
weaknesses
that could result in possible future field failures.
During HALT, prototype and pre-production DC/DC converters are subjected
to progressively higher stress levels induced by thermal cycling, rate of
temperature change, vibration, power cycling, product-specific stresses (such
as dc voltage variation) and combined environments. The stresses are not
meant to simulate field 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 weaknesses 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.
Murata Power Solutions has invested in a Qualmark OVS-1 HALT tester
Typical HALT Profile
100
80
60
Temperature (°C)
40
20
0
–20
–40
10
20
30
40
50
60
70
80
90
0
20
Random Vibration (G's)
40
physical limit of the device. We also use the HALT chamber and its ability to rapidly
cool devices to verify their "cold-start" capabilities.
Qualification
For each new product, electrical performance is verified via a comprehensive
characterization process and long-term reliability is confirmed via a rigorous quali-
fication procedure. The qual procedure includes such strenuous tests as thermal
shock and 500 hour life. Qual testing is summarized below.
Qualification Testing
Qualification Test
HALT
High Temperature Storage
Thermal Shock
Temperature/Humidity
Lead Integrity
Life Test
Marking Permanency
End Point Electrical Tests
* Interim electrical test at 200 hours.
Method/Comments
Murata Power Solutions in-house procedure
Max. rated temp., 1,000 hours
10 cycles, –55 to +125°C
+85°C, 85% humidity, 48 hours
Murata Power Solutions in-house procedure
+70°C, 500 hours*
Murata Power Solutions in-house procedure
Per product specification
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 statistically sampled,
charted and fine 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 final-electrical tested prior to external
visual examination, packing and shipping.
Rapid Response to Problems
Murata Power Solutions employs an outstanding corrective-action system
to immediately address any detected shortcomings in either products or
processes. Whenever 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, under-
take corrective actions. Over time, this system has helped refine our assembly
operation to yield one of the lowest product defect rates in the industry.
Test Time (minutes)
capable of applying voltage and temperature extremes as well as 6-axis,
linear and rotational, random vibration. A typical HALT profile (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 Murata Power Solutions’ A-Series could not be made to fail prior
to reaching either the limits of the HALT chamber or some previously known
USA:
UK:
France:
Japan:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com
Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com
Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com
Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com
Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com
Website: www.murata-ps.jp
Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
Canada:
Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com
ISO 9001 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.
© 2008 Murata Power Solutions, Inc.
Germany:
München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com
China:
04/07/08
www.murata-ps.com
Technical enquiries
email: sales@murata-ps.com, tel:
+1 508 339 3000
MDC_TWR12-15.B01
Page 5 of 5
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