UEI15_10 Datasheet, PDF (7/14 Pages) Murata Power Solutions Inc. – Isolated Wide Input Range 15-Watt DC/DC Converters

UEI15 Series
Isolated Wide Input Range 15-Watt DC/DC Converters
ABSOLUTE MAXIMUM RATINGS
Input
Voltage
Q12 models
Q48 models
Volts Max. continuous
Volts, transient 100mS
Volts Max. continuous
Volts, transient 100mS
On/Off control,
referred to –VIN
Volts, Min.
Volts, Max.
Input Reverse Polarity Protection
Output Overvoltage, Volts Max.
Output Current, sustained short circuit
Storage Temperature
Range, Min. ºC
Max. ºC
36 VDC
50 VDC
75 VDC
100 VDC
–0.3
15
See fuse section
VOUT nom. +20%
Current-limited, see specs
-55
+125
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 Specifi-
cations is neither implied nor recommended.
SPECIFICATION NOTES
(1) All models are tested and specified with external capacitors listed in the
table below. The external capacitors listed below are ONLY for establishing test
specifications. They are required for our test fixtures and equipment. Your applica-
tion may not need them. The converter is stable with no external capacitors but
Murata Power Solutions strongly recommends external caps. All caps are low-ESR
types. Where two or more capacitors are listed, these are connected in parallel. All
caps should mount close to the DC/DC using short leads.
All specifications are typical unless noted. General conditions for Specifica-
tions are +25 deg.C, VIN=nominal, VOUT=nominal, full load. Adequate airflow
must be supplied for extended testing under power.
(2) Input Ripple Current is tested and specified over a 5 Hz to 20 MHz band-
width. Input filtering is CIN=33 μF, 100V tantalum, CBUS=220 μF, 100V elec-
trolytic, 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.
INPUT/OUTPUT EXTERNAL TEST CAPACITORS
Model
Input Capacitor Output Capacitor(s)
UEI15-033-Q12
100 μF
1 μF & 10 μF
UEI15-033-Q48
4.7 μF ceramic
1 μF & 10 μF
UEI15-050-Q12
100 μF
1 μF & 10 μF
UEI15-050-Q48
4.7 μF ceramic
1 μF & 10 μF
UEI15-120-Q12
100 μF
1 μF & 10 μF
UEI15-120-Q48
4.7 μF ceramic
1 μF & 10 μF
UEI15-150-Q12
100 μF
1 μF & 10 μF
UEI15-150-Q48
4.7 μF ceramic
1 μF & 10 μF
(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 controlled by a switch. But it may also be
driven with external logic or by applying appropriate external voltages which
are referenced to Input Common. The On/Off Control Input should use either an
open collector or open drain transistor.
(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. This
may damage the outputs.
(8) Output noise may be further reduced by adding an external filter. See
I/O Filtering and Noise Reduction.
(9) All models are fully operational and meet published specifications,
including “cold start” at –40⁰ 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 after fault
removal. 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.
(13) Do not exceed maximum power specifications when adjusting the
output trim.
(14) At zero output current, the output may contain low frequency com-
ponents 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.
(16) “Hiccup” operation repeatedly attempts to restart the converter with
a brief, full-current output. If the overcurrent 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 con-
verter immediately recovers normal operation.
(17) On model UEI15-050-Q48, if VIN <20V, output trim may only be adjusted
downwards from +5.0V (more negative).
(18) Shown at Vin = 10V.
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.
www.murata-ps.com
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20 Apr 2010 MDC_UEI15W.B37 Page 7 of 14