www.murata-ps.com
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
Featuring a full 50-60 Watt output in 2.9 square inches of board area,
the UEI series isolated DC/DC converter family offers efficient
regulated DC power for printed circuit board mounting.
PRODUCT OVERVIEW
Wide range 4:1 inputs on the 1.50" x 1.90" x
0.38" converter are either 9 to 36 Volts DC (Q12
models) or 18 to 75 Volts DC (Q48 models), ideal
for battery-powered and telecom equipment.
Fixed output voltages from 3.3 VDC to 15 VDC are
regulated to within ±0.05% and may be trimmed
within ±10% of nominal output. Applications
include small instruments, computer-based
systems, data communications equipment, remote
sensor systems, vehicle and portable electronics.
The UEI 50-60W Series includes full magnetic
and optical isolation up to 2250 Volts DC (basic
insulation). For connection to digital systems, the
outputs offer fast settling to current step loads
and tolerance of higher capacitive loads. Excellent
ripple and noise specifications assure compatibil-
ity to circuits using CPU’s, ASIC’s, programmable
logic and FPGA’s. No minimum load is required.
For systems requiring controlled startup/shut-
down, an external switch, transistor or digital logic
may be used to activate the remote On/Off control.
Remote Sense inputs compensate for resistive line
drops at high currents.
A wealth of self-protection features avoid both
converter and external circuit problems. These
include input undervoltage lockout, input overvolt-
age and overtemperature shutdown. The outputs
current limit using the “hiccup” autorestart
technique and the outputs may be short-circuited
indefinitely. Additional features include output
overvoltage and reverse conduction elimination.
The synchronous rectifier forward topology offers
high efficiency for minimal heat buildup and “no
fan” operation.
Typical unit
FEATURES
Small footprint DC/DC converter, ideal for high
current applications
Industry standard 1.50˝ x 1.90˝ x 0.38˝ open
frame package and pinout
range input voltages 9-36 and 18-75Vdc
Wide
Assembly and attachment for RoHS standards
Isolation up to 2250 VDC (basic)
to 50-60W total output power with
Up
overtemperature shutdown
efficiency synchronous rectifier forward
High
topology
Stable no-load operation with no required
external components
to +85°C temperature range with derating
–40
ed to UL60950-1, CSA-C22.2 No. 234,
Certifi
EN60950-1, 2nd Edition safety approvals
Extensive self-protection shut down features
RoHS-6 compliant
SIMPLIFIED SCHEMATIC
+V
OUT
+V
IN
GATE
DRIVE
–V
IN
–V
OUT
ISOLATION
BARRIER
+SENSE
On/Off
Control
Control
OPTO
ISOLATION
Reference, trim &
Error Amplifier
TRIM
–SENSE
Typical topology is shown.
For full details go to
www.murata-ps.com/rohs
Figure 1. Simplified block diagram
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MDC_UEI Series 50-60W.C11
Page 1 of 14
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
Power
R/N (mVp-p) Regulation (Max.)
V
IN
V
OUT
I
OUT
Nom.
(V)
(A)
(W)
Typ.
Max.
Line
Load
(V)
Root Model
UEI-3.3/15-Q12PR-C
UEI-3.3/18-Q48NR-C
UEI-5/10-Q12PR-C
UEI-5/12-Q48NR-C
UEI-12/4.2-Q12P-C
UEI-12/5-Q48N-C
UEI-15/3.3-Q12P-C
UEI-15/4-Q48N-C
3.3
3.3
5
5
12
12
15
15
15.0
18.0
10.0
12.0
4.2
5.0
3.3
4.0
49.5
59.4
50.0
60.0
50.4
60.0
49.5
60.0
15
60
35
70
50
40
30
35
30
125
50
100
120
70
100
60
±0.05% ±0.06%
±0.075% ±0.2%
±0.1%
±0.1%
±0.1% ±0.15%
±0.05% ±0.05%
±0.2%
±0.2%
±0.075% ±0.05%
±0.075% ±0.05%
24
48
24
48
24
48
24
48
Input
Range
(V)
9-36
18-75
9-36
18-75
9-36
18-75
9-36
18-75
I
IN
,
no load
(mA)
130
130
130
130
130
130
130
50
Efficiency
I
IN
, full
load (A)
2.33
1.38
2.31
1.37
2.35
1.42
2.29
1.40
Min.
86.8%
87%
89%
89.5%
87.8%
87%
88.3%
87.5%
Typ.
88.5%
89.5%
90%
91%
89.5%
89.8%
90%
89.3%
Sense
Input
yes
yes
yes
yes
no
no
no
no
Package
Case
C74
C74
C74
C74
C74
C74
C74
C74
Pinout
P52
P52
P52
P52
P51
P51
P51
P51
These are partial model numbers. Please refer to the full model number structure for complete
ordering part numbers.
Sense input is not included for 12 V
OUT
and higher models. Sense is optional for 5 V
OUT
and lower.
All specifications are typical at nominal line voltage and full load, +25 deg.C. unless otherwise
noted. See detailed specifications.
Output capacitors are 1 μF ceramic || 10 μF electrolytic. Input cap is 22 μF, low ESR.
I/O caps are necessary for our test equipment and may not be needed for your application.
PART NUMBER STRUCTURE
UEI
-
3.3
/
15
-
Q12 P R H Lx
-
C
Unipolar Wide Input
Nominal Output Voltage
Pin Length Option
Blank = standard pin length 0.25 in. (6.35 mm)
L1 = 0.110 in. (2.79 mm)
*
L2 = 0.145 in. (3.68 mm)
*
Conformal Coating Option
Blank
= No coating, standard
H
= Coating added, optional
(built to order; contact Murata Power Solutions for MOQ and lead times.)*
Sense Inputs (5 V
OUT
and lower):
R
= Sense included as standard (for 5 V
OUT
and lower models only. 12 V
OUT
and higher
models do not offer the sense option.)
Blank
= Sense not installed for 5 V
OUT
and lower models. Pins 5 and 8 omitted.
RoHS-6 Hazardous Substance Compliance
(does not claim EU RoHS exemption 7b–lead in solder)
Maximum Rated Output
Current in Amps
Input Voltage Range:
Q12
= 9-36V
Q48
= 18-75V
On/Off Control Logic:
P
= Positive
N
= Negative
Positive “P” logic is standard for Q12 models and optional special
order for Q48 models. Negative “N” logic is standard for Q48
models and optional special order for Q12 models.
*Minimum
order quantity is required. Samples available with standard pin length only.
Note:
Some model number combinations may not be available. See website or contact your local Murata sales representative.
www.murata-ps.com/support
MDC_UEI Series 50-60W.C11
Page 2 of 14
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
FUNCTIONAL SPECIFICATIONS
INPUT CHARACTERISTICS
Remote On/Off Control
Input Current
Under- Reflected
Recom- Internal
Start-up voltage (back)
mended Input Reverse
Polarity On/Off
threshold Shut-
Ripple Inrush Output Low Standby Fuse
Filter
Short
Negative Logic
2
Tran-
Protection Current Positive Logic
down Current
Line Mode
Type
sient Circuit
V
V
mA pk-pk A
2
sec mA
A
mA
A
mA “P” model suffix “N” model suffix
9.5
8.5
6.25
12
17.3
16.0
3.71
6
OFF=Gnd pin or
OFF=open pin
9.5
8.25
6.21
12
30
–0.7 to +1.2V
or +10 to +15V
None
17.3
16.0*
3.70
6
0.05
50
1
L-C
- see
1
max. ON=open
max. ON=Gnd
9.5
8.5
6.31
10
notes
pin or +10 to
pin or –0.7 to
17.5
16.7
3.88
6
+15V max.
+1.2V max.
9.5
8.5
45
6.15
9
17.2
16.3
30
3.77
6
Model Family
V
IN
UEI-3.3/15-Q12
UEI-3.3/18-Q48
UEI-5/10-Q12
UEI-5/12-Q48
UEI-12/4.2-Q12
UEI-12/5-Q48
UEI-15/3.3-Q12
UEI-15/4-Q48
*At 50% load
V
24
48
24
48
24
48
24
48
OUTPUT CHARACTERISTICS
Line/Load
Regulation
I
OUT
Max.
A
15
18
10
12
4.2
5
3.3
4
Adjustment Temperature Remote Sense
Range
Coefficient Compensation Low ESR, resistive load
% of V
NOM
% of V
OUT
/ºC % of V
OUT
max.
+5
+5
+5
+5
±0.02
Not Available
μF
OV
protection
method
Minimum
loading
Efficiency
Capacitive Loading Max.
Ripple/Noise
(20 MHz
bandwidth)
8
V
OUT
Accuracy
50% Load
% of V
NOM
±2
Overvoltage
protection
Hiccup auto-start
after fault removal
V
3.9
3.9
5.9
6.4
16.5
16
24
21.5
Model Family
UEI-3.3/15-Q12
UEI-3.3/18-Q48
UEI-5/10-Q12
UEI-5/12-Q48
UEI-12/4.2-Q12
UEI-12/5-Q48
UEI-15/3.3-Q12
UEI-15/4-Q48
±1
±10
2,000
No
mini- Magnetic
See ordering guide
mum feedback
load
ABSOLUTE MAXIMUM RATINGS
Volts, max. continuous
Q12 models
Volts, transient, 100 mSec
Input Voltage
Volts, max. continuous
Q48 models
Volts, transient, 100 mSec
On/Off control, referred to –Vin
Input Reverse Polarity Protection
Output Overvoltage
0-36 VDC to rated specifications
50 VDC, no damage
0-75 VDC to rated specifications
100 VDC, no damage
-0.7 V. min to +15V max.
See fuse section
V
OUT
nom. +20% max.
Current-limited. Devices can
withstand sustained short circuit
without damage. The outputs are
not intended to accept appreci-
able reverse current.
Device includes electronic over-
temperature shutdown protection
under normal operation.
-55 to +125° C.
See soldering specifications
Absolute Maximum Ratings
Absolute maximums 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 nor
recommended.
Maximum Ratings Notes
The UEI-50/60W series does not include electronic Input Overvoltage
Protection. Therefore it is possible for the input to exceed the con-
tinuous ratings listed above and still operate. However, units are not
routinely Production-tested above the continuous ratings. Therefore,
the rated specifications do not apply at excessive input voltage and
performance is undetermined.
The transient specifications indicate that sample lots were suc-
cessfully tested for 100 mS at the transient stress voltage and were
not damaged. As a practical matter in your application, it is often
difficult to determine how long an input overvoltage was applied.
Therefore, do not exceed the continuous voltage rating.
Output Current
Overtemperature Protection
Storage Temperature
Lead Temperature
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MDC_UEI Series 50-60W.C11
Page 3 of 14
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
ISOLATION CHARACTERISTICS
Input to
Output.
Model Family
Min
VDC
UEI-3.3/15-Q12
UEI-3.3/18-Q48
UEI-5/10-Q12
UEI-5/12-Q48
UEI-12/4.2-Q12
UEI-12/5-Q48
UEI-15/3.3-Q12
UEI-15/4-Q48
2000
2250
2000
2250
2000
2250
2000
2250
Min
MΩ
10
10
10
10
10
10
10
10
1000
Basic
insulation
Isolation
Resistance
Isolation
Capacitance Isolation Safety
Rating
pF
UEI-3.3/15-Q12
UEI-3.3/18-Q48
UEI-5/10-Q12
UEI-5/12-Q48
UEI-12/4.2-Q12
UEI-12/5-Q48
UEI-15/3.3-Q12
UEI-15/4-Q48
DYNAMIC CHARACTERISTICS
Start-up Time
Dynamic Load
Response
V
IN
to V
OUT
Remote On/Off Switching
Frequency
(50-75-50% regulated
to V
OUT
load step)
(Max.) regulated (Max.)
μsec
100 to 2% V
OUT
180 to 2% V
OUT
200 to 2% V
OUT
100 to 2% V
OUT
200 to 1% V
OUT
400 to 1% V
OUT
150 to 1% V
OUT
150 to 1% V
OUT
50
50
275
250
265
255
mSec
mSec
KHz
275
280
Model Family
MISCELLANEOUS CHARACTERISTICS
Output Current
Limit Inception
Model Family
Output
Short
Circuit
98% of V
OUT
,
after warmup Protection
Method
A
20
23
13
15.5
6
6.1
5.3
5.8
as much output filtering as needed
to achieve your noise requirements. Excessive output capacitance
can retard transient response or possibly cause instability. Low ESR ceramic capacitors may degrade
dynamic performance. Be sure to thoroughly test your system under full load with all components
installed.
(9) All models are fully operational and meet published specifications, including “cold start” at –40°C.
(10) Regulation specifications describe the deviation as the line input voltage or output load current is
varied from a nominal midpoint value to either extreme.
(11) The output overvoltage protection is automatic recovery. The overvoltage may occur either from
internal failure or from an external forcing voltage as in a shared power system.
(12) Output current limit and short circuit protection is non-latching. When the overcurrent fault is
removed, the converter will immediately recover. After an output overcurrent or short circuit, “hiccup”
operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcur-
rent condition still exists, the restart current will be removed and then tried again. This short current
pulse prevents overheating and damaging the converter. Once the fault is removed, the converter
immediately resumes normal operation.
(13) Do not exceed maximum power specifications when adjusting the output trim.
(14) At zero output current, the output may contain low frequency components which exceed the
ripple specification. The output may be operated indefinitely with no load.
(15) If reverse polarity is accidentally applied to the input, to ensure reverse input protection with full
output load, always connect an external input
fuse
in series with the +Vin input. Use approximately
twice the full input current rating with nominal input voltage.
CAUTION:
This product is not internally fused. To comply with safety agency certifications and to
avoid injury to personnel or equipment, the user
must
connect an external fast-blow fuse to the input
terminals. See fuse information.
Output
Short
Circuit
Current
A
Output
Calculated
Short Circuit
Pre-biased
MTBF
Duration
setup
(output shorted
to ground)
Hours
3,858,079
Operating Temperature
Range
Relative
Storage
Thermal
Humidity,
temperature protection/
non-
range
shutdown
condensing
ºC
ºC
ºC
UEI-3.3/15-Q12
UEI-3.3/18-Q48
UEI-5/10-Q12
UEI-5/12-Q48
UEI-12/4.2-Q12
UEI-12/5-Q48
UEI-15/3.3-Q12
UEI-15/4-Q48
Specification Notes:
Current
limiting,
hiccup
auto
restart
0.5
Continuous
Monotonic
(external
V
OUT
< V
SET
) 2,000,000
–40 to +85ºC;
with Derating
(see Notes)
–55 to 125ºC
115
To +85ºC/
85%
(1) All models are tested and specified with external 1||10 μF output capacitors and a 22 μF external
input capacitor. All capacitors are low ESR types. These capacitors are necessary to accommodate
our test equipment and may not be required to achieve specified performance in your applications. All
models are stable and regulate within spec under no-load conditions.
All specifications are typical unless noted. General conditions for Specifications are +25 deg.C,
Vin=nominal, Vout=nominal, full load. Adequate airflow must be supplied for extended testing under
power.
(2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering
is Cin=33 μF, 100V, Cbus=220 μF, 100V, Lbus=12 μH.
(3) Note that Maximum Power Derating curves indicate an
average
current at nominal input voltage.
At higher temperatures and/or lower airflow, the DC/DC converter will tolerate brief full current
outputs if the total RMS current over time does not exceed the Derating curve. All Derating curves
are presented at sea level altitude. Be aware of reduced power dissipation with increasing density
altitude.
(4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3,
ground fixed conditions, Tpcboard=+25 deg.C, full load, natural air convection.
(5) The On/Off Control is normally selected by a switch or an open collector or open drain transistor.
But it may also be driven with external logic or by applying appropriate external voltages which are
referenced to Input Common and do not exceed the On/Off voltage specifications.
(6) Output current limiting begins when the output voltage degrades approximately 2% from the
selected setting.
(7) The outputs are not intended to sink appreciable reverse current.
(8) Output noise may be further reduced by adding an external filter. Low voltage logic circuits may
have a small voltage margin between logic ZERO and logic ONE, requiring noise suppression.
Use only
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MDC_UEI Series 50-60W.C11
Page 4 of 14
UEI Series
50-60W Isolated Wide-Range DC/DC Converters
Typical Performance Curves
UEI-3.3/15-Q12
Efficiency vs. Line Voltage and Load Current @ 25ºC
90
15.5
UEI-3.3/15-Q12N Maximum Current Temperature Derating at Sea Level
(V
IN
= 24V, air flow is from pin 2 to pin 1)
85
15.0
V
IN
= 10V
Efficiency (%)
80
V
IN
= 12V
V
IN
= 24V
Output Current (Amps)
14.5
Natural Convection
14.0
100 LFM
13.5
200 LFM
13.0
75
V
IN
= 36V
70
65
12.5
60
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
12.0
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Load Current (Amps)
Ambient Temperature (
°
C)
UEI-3.3/18-Q48
Efficiency vs. Line Voltage and Load Current @ 25ºC
90
88
86
18.0
17.5
UEI-3.3/18-Q48N Maximum Current Temperature Derating at Sea Level
(V
IN
= 48V air flow direction is transverse)
Efficiency (%)
84
82
80
78
76
74
72
70
1
2
3
4
5
6
7
8
9
10
V
IN
= 24V
V
IN
= 36V
V
IN
= 48V
V
IN
= 60V
Output Current (Amps)
V
IN
= 18V
17.0
16.5
16.0
Natural Convection
15.5
15.0
14.5
14.0
13.5
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
100 LFM
200 LFM
300 LFM
400 LFM
V
IN
= 75V
11
12
13
14
15
16
17
18
Load Current (Amps)
Ambient Temperature (
°
C)
UEI-5-10-Q12
Efficiency vs. Line Voltage and Load Current @ 25ºC
100
90
80
Efficiency (%)
VIN = 10V
70
60
50
40
30
1
2
3
4
5
6
7
8
9
10
VIN = 24V
VIN = 36V
Output Current (Amps)
10.5
UEI-5/10-Q12N Maximum Current Temperature Derating at Sea Level
(V
IN
= 24V, airflow is from pin 2 to pin 1)
10.0
9.5
Natural Convection
9.0
8.5
8.0
7.5
7.0
40
45
50
55
60
65
70
75
80
85
Load Current (Amps)
Ambient Temperature (
°
C)
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MDC_UEI Series 50-60W.C11
Page 5 of 14
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