Featuring a full 30 Watt output in 1.8 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 0.92" x 1.92" x 0.35"
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 tightly
regulated and may be trimmed within ±10%
of nominal output. Applications include small
instruments, computer-based systems, data com-
munications equipment, remote sensor systems,
vehicle and portable electronics.
The UEI 30W Series includes full magnetic
and optical isolation up to 2250 Volts DC (basic
insulation), Q48 models. 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 compatibility to circuits using CPU’s, ASIC’s,
programmable logic and FPGA’s. No minimum
load is required. For systems requiring controlled
startup/shutdown, 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 and overtem-
perature 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
0.92" x 1.92" x 0.35" open frame package
Wide range input voltages 9-36 and 18-75Vdc
Assembly and attachment for RoHS-6 hazard-
ous substance compliance
Isolation up to 2250 VDC (basic), Q48 models
Up to 30W total output power with
overtemperature shutdown
High efficiency synchronous rectifier forward
topology
Stable no-load operation with no required
external components
–40 to +85°C temperature range; see derating
Certified to UL60950-1, CSA-C22.2 No. 234,
EN60950-1 safety approvals
Extensive self-protection shut down features
RoHS-6 hazardous substance compliant
SIMPLIFIED SCHEMATIC
+V
OUT
+V
IN
GATE
DRIVE
–V
IN
–V
OUT
ISOLATION
BARRIER
On/Off
Control
Control
For full details go to
www.murata-ps.com/rohs
Typical topology is shown.
OPTO
ISOLATION
Reference, trim &
Error Amplifier
TRIM
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MDC_UEI Series 30W.A18
Page 1 of 18
UEI30 Series
30W 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)
Part Number
UEI30-033-Q12P-C
UEI30-033-Q48N-C
UEI30-050-Q12P-C
UEI30-050-Q48N-C
UEI30-120-Q12P-C
UEI30-120-Q48N-C
UEI30-150-Q12P-C
UEI30-150-Q48N-C
3.3
3.3
5
5
12
12
15
15
9
9
6
6
2.5
2.5
2
2
29.7
29.7
30
30
30
30
30
30
25
50
35
50
60
30
40
50
35
75
50
75
120
60
65
100
±0.2% ±0.25%
±0.2% ±0.25%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.2%
±0.1%
±0.1%
±0.1%
±0.1%
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
,
I
IN
, full
no load
load (A)
(mA)
130
50
130
130
75
40
95
50
1.39
0.69
1.4
0.69
1.4
0.7
1.4
0.7
Efficiency
Min.
87.3%
87%
88%
89.5%
87.5%
87.5%
87.5%
87.5%
Typ.
89%
89.5%
89.5%
91%
89%
89%
89%
89.5%
Open Frame
Package, C80
Case
C80
C80
C80
C80
C80
C80
C80
C80
Pinout
P21
P21
P21
P21
P21
P21
P21
P21
Please refer to the part number structure for additional options and complete ordering part numbers.
All specifications are at nominal line voltage and full load, +25 deg.C. unless otherwise noted. See
detailed specifications.
Output capacitors are 1 μF ceramic in parallel with 10 μF electrolytic. Input cap is 22 μF, low ESR.
These I/O caps are necessary for our test equipment and may not be needed for your application.
Sense input is not included for 12 Vout and higher models. Sense is optional for 5 Vout and lower.
PART NUMBER STRUCTURE
UEI30
-
050
-
Q48 N Lx
-
C
RoHS-6 hazardous substance compliance
(does not claim EU RoHS exemption 7b–lead in solder)
Nominal Output Voltage
In tenths of a volt
Pin Length Option
Blank
= Std. pin length 0.25˝ (6.3mm)
L1
= 0.110˝ (2.79mm)*
L2
= 0.145˝ (3.68mm)*
On/Off Control Polarity:
*Special quantity order is required;
P
= Positive
no sample quantities available.
N
= Negative
Positive “P” polarity is standard for Q12 models and optional special
order for Q48 models. Negative “N” polarity is standard for Q48
models and optional special order for Q12 models.
Note:
Some model number combinations
may not be available. Please contact
Murata Power Solutions.
Input Voltage Range:
Q12
= 9-36V
Q48
= 18-75V
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifica-
tions may cause damage to the product. Your production environment may differ; 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
Maximum Pot Temperature
Maximum Solder Dwell Time
115° C.
270° C.
7 seconds
For Sn/Pb based solders:
Maximum Preheat Temperature
Maximum Pot Temperature
Maximum Solder Dwell Time
105° C.
250° C.
6 seconds
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MDC_UEI Series 30W.A18
Page 2 of 18
UEI30 Series
30W Isolated Wide-Range DC/DC Converters
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
3.75
6
17.3
16.0*
1.89
6
1
1
OFF=Gnd pin or
OFF=open pin
9.5
8.0
3.75
6
None,
50
–0.7 to +1.2V
or +10 to +15V
17.0
16.2
1.89
6
install
30
0.05
L-C
max. ON=open
max. ON=Gnd
external
9.5
8.3
3.75
3
6
3.5
pin or +10 to
pin or –0.7 to
fuse
17.0
16.5
1.85
4
+15V max.
+1.2V max.
1
1
9.5
8.3
80
3.72
6
16.9
16.3
50
1.83
4
Model Family
UEI30-033-Q12P-C
UEI30-033-Q48N-C
UEI30-050-Q12P-C
UEI30-050-Q48N-C
UEI30-120-Q12P-C
UEI30-120-Q48N-C
UEI30-150-Q12P-C
UEI30-150-Q48N-C
*Specified at half load
Line/Load
Regulation
UEI30-033-Q12P-C
UEI30-033-Q48N-C
UEI30-050-Q12P-C
UEI30-050-Q48N-C
UEI30-120-Q12P-C
UEI30-120-Q48N-C
UEI30-150-Q12P-C
UEI30-150-Q48N-C
% of V
NOM
2
Adjustment Temperature
Range
Coefficient Low ESR <0.02Ω Max,
resistive load
% of V
NOM
% of V
OUT
/ºC
μF
1
±10
±0.02
2,000
No
Magnetic
See ordering guide
feedback
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.
None, install external fuse
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 transient specifications indicate that sample lots were success-
fully 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 30W.A18
Page 3 of 18
OV
protection
method
Minimum
loading
Efficiency
Capacitive Loading Max.
Ripple/Noise
(20 MHz
bandwidth)
8
OUTPUT CHARACTERISTICS
V
OUT
Accuracy
Model Family
50% Load
Overvoltage
protection
Hiccup auto-start
after fault removal
V
5.0
5.0
7.0
7.3
15.5
14.1
18.5
24
UEI30 Series
30W Isolated Wide-Range DC/DC Converters
ISOLATION CHARACTERISTICS
Input to
Output.
Model Family
Min
VDC
UEI30-033-Q12P-C
UEI30-033-Q48N-C
UEI30-050-Q12P-C
UEI30-050-Q48N-C
UEI30-120-Q12P-C
UEI30-120-Q48N-C
UEI30-150-Q12P-C
UEI30-150-Q48N-C
2000
2250
2000
2250
2000
2250
2000
2250
10
Min
MΩ
Isolation
Resistance
Isolation
Capacitance Insulation Safety
Rating
pF
1000
1000
1000
1000
1500
1500
1500
2000
Basic
UEI30-033-Q12P-C
UEI30-033-Q48N-C
UEI30-050-Q12P-C
UEI30-050-Q48N-C
UEI30-120-Q12P-C
UEI30-120-Q48N-C
UEI30-150-Q12P-C
UEI30-150-Q48N-C
DYNAMIC CHARACTERISTICS
Start-up Time
Dynamic Load
Response
V
IN
to V
OUT
Remote On/Off Switching
(50-75-50% regulated
Frequency
to V
OUT
load step)
(Max.) regulated (Max.)
μsec
120 to 2%
180 to 2%
80 to 2%
100 to 1%
200 to 1%
150 to 1%
150 to 1%
150 to 1%
50
50
mSec
mSec
KHz
275
280
275
275
275
275
275
275
Model Family
MISCELLANEOUS CHARACTERISTICS
Output Current
Limit Inception
Model Family
Output
Short
Circuit
98% of V
OUT
,
after warmup Protection
Method
A
11.5
11.2
7.9
7.0
4.1
3.65
3.0
3.25
Current
limiting,
hiccup
auto
restart
Output
Short
Circuit
Current
A
0.3 max.
0.3 max.
3.0
0.3 max.
1.5
0.75
0.5
0.1 max.
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 overvoltage and short circuit protection is non-latching. When the overvoltage 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.
Relative
Storage
Thermal
Output Short
Humidity,
Output
Circuit Duration
Operating Temperature temperature protection/
non-
Pre-biased
range
shutdown
(output shorted
Range
condensing
setup
to ground)
ºC
ºC
ºC
UEI30-033-Q12P-C
UEI30-033-Q48N-C
UEI30-050-Q12P-C
UEI30-050-Q48N-C
UEI30-120-Q12P-C
UEI30-120-Q48N-C
UEI30-150-Q12P-C
UEI30-150-Q48N-C
Continuous
Monotonic
(external
V
OUT
< V
SET
)
–40 to +85ºC;
with Derating
(see Notes)
–55 to 125ºC
115
To +85ºC/
85% RH
Specification Notes:
(1) All models are tested and specified with external 1 μF and 10 μF parallel 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) Refer to page 10 for MTBF values.
(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 as much output filtering as needed
to achieve your noise requirements. Excessive output
www.murata-ps.com/support
MDC_UEI Series 30W.A18
Page 4 of 18
UEI30 Series
30W Isolated Wide-Range DC/DC Converters
PERFORMANCE DATA
Efficiency vs. Line Voltage and Load Current @ 25°C
UEI30-033-Q12
Maximum Current Temperature Derating @Sea Level
(V
IN
= 12V, airflow is from input to output)
90
9
8.8
85
8.6
8.4
Output Current (Amps)
80
Efficiency (%)
Vin = 36 V
75
8.2
8
7.8
7.6
7.4
7.2
7
20
25
30
35
40
45
50
55
Natural convection
100 LFM
200 LFM
300 LFM
400 LFM
Vin = 24 V
Vin = 12 V
Vin = 9 V
70
65
60
65
70
75
80
85
90
60
0
1
2
3
4
5
6
7
8
9
Ambient Temperature (ºC)
Load Current (Amps)
Efficiency vs. Line Voltage and Load Current @ 25°C
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