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
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 2,000,000
V
OUT
< V
SET
)
–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
www.murata-ps.com
27 May 2010
email: sales@murata-ps.com
MDC_UEI Series 50-60W.B31
Page 5 of 13
MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
