additional external load capacitance the rise time of the input voltage will determine the maximum external
capacitance value for guaranteed start up. The slower the rise time of the input voltage the greater the maximum value of the
additional external capacitance for reliable start up.
INPUT CHARACTERISTICS
Parameter
Voltage range
Reflected ripple voltage
Conditions
Continuous operation, 5V input types
Continuous operation, 12V input types
BW=DC to 20MHz, all output types
Min.
4.5
10.8
Typ.
5.0
12.0
Max.
5.5
13.2
200
Units
V
mV
OUTPUT CHARACTERISTICS
Parameter
Rated Power
Voltage Set Point Accuracy
Line regulation
Load Regulation
Ripple and Noise
Conditions
T
A
= 0°C to 70°C
See tolerance envelope
High V
IN
to low V
IN
10% load to rated load, 5V output types
10% load to rated load, 12V & 15V output types
BW=DC to 20MHz, all output types
Min.
Typ.
Max.
5.0
Units
W
%/%
DESCRIPTION
The NMXU series of DC/DC converters is par-
ticularly suited to isolating and/or converting DC
power rails. The galvanic isolation allows the
device to be configured to provide an isolated
negative rail in systems where only positive rails
exist. The devices are particularly suited for use
in distributed power systems where there is low
variation in the bus voltage levels.
1.1
7
5
12
7.5
125
%
mV p-p
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
2
Lead temperature 1.5mm from case for 10 seconds
Input voltage V
IN
, NMXU05 types
Input voltage V
IN
, NMXU12 types
1 second
300°C
7V
15V
1. Calculated using MIL-HDBK-217F with nominal input voltage at full load.
2. Supply voltage must be disconnected at the end of the short circuit duration.
All specifications typical at T
A
=25°C, nominal input voltage and rated output current unless otherwise specified.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
KDC_NMXU.F01
Page 1 of 3
NMXU Series
Isolated 5W Single & Dual Output DC/DC Converters
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Resistance
Conditions
Flash tested for 1 second
Viso= 1000VDC
Min.
1000
1
Typ.
Max.
Units
VDC
GΩ
GENERAL CHARACTERISTICS
Parameter
Switching frequency
Conditions
All input types
Min.
Typ.
70
Max.
Units
kHz
TEMPERATURE CHARACTERISTICS
Parameter
Specification
Storage
Case temperature rise above
ambient
Cooling
Conditions
All output types
5V output types
All other output types
Free air convection
Min.
0
-55
Typ.
Max.
70
100
Units
°C
30
20
TOLERANCE ENVELOPE
+10%
+5%
V
NOM
RoHS COMPLIANCE INFORMATION
Typical
Lo
ad Line
+2.5%
-2.5%
-7.5%
Output Voltage
This series is compatible with RoHS soldering
systems with a peak wave solder temperature of
300ºC for 10 seconds. The pin termination finish
on this product series is Matte Tin over Nickel
Preplate. The series is backward compatible with
Sn/Pb soldering systems.
10
75
50
25
Output Load Current (%)
100
For further information, please visit www.murata-ps.com/rohs
TECHNICAL NOTES
ISOLATION VOLTAGE
‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Voltage’ & ‘Isolation Test Voltage’ are all terms that relate to the same thing, a test voltage,
applied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.
Murata Power Solutions NMXU series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
For a part holding no specific agency approvals, such as the NMXU series, both input and output should normally be maintained within SELV limits i.e. less than 42.4V peak, or
60VDC. The isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation system. The part
could be expected to function correctly with several hundred volts offset applied continuously across the isolation barrier; but then the circuitry on both sides of the barrier must
be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-accessible circuitry according to
safety standard requirements.
REPEATED HIGH-VOLTAGE ISOLATION TESTING
It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materi-
als, construction and environment. The NMXU series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enameled wire.
While parts can be expected to withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any material, including this enamel
(typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited.
We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from specified test voltage.
This consideration equally applies to agency recognized parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further
insulation system of physical spacing or barriers.
www.murata-ps.com/support
KDC_NMXU.F01
Page 2 of 3
NMXU Series
Isolated 5W Single & Dual Output DC/DC Converters
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
0.985 (25.03)
PIN CONNECTIONS
Single Output Variants
Pin
Function
Dual Output Variants
Pin
Function
1
2
3
4
5
V
IN
+V
IN
+V
OUT
Common
-V
OUT
0.925
(23.50)
NMXD0515UC
XYYWW
1
2
3
4
5
-V
IN
+V
IN
+V
OUT
Not fitted
-V
OUT
0.394
(10.00)
RECOMMENDED FOOTPRINT DETAILS
0.157 (4.0)
0.2 (5.08)
1
0.80
(20.32)
5
0.063 (1.59)
0.093 (2.35)
0.4 (10.16)
2
0.035±0.00197
(0.90±0.05)
*
4
3
0.0098±0
(0.25±0.
0.4 (10.16)
Weight: 10g
* Hole not required for single output variants
All dimensions in inches ±0.01 (mm ±0.25mm).
Pin not fitted on single output variants.
All dimensions in inches ±0.01 (mm ±0.25mm). All pins on a 0.1 (2.54) pitch and within ±0.01 (0.25) of true position.
*
TUBE OUTLINE DIMENSIONS
Not to scale.
All dimensions in inches ±0.01 (mm ±0.25mm).
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following
operating requirements
and the
Life and Safety Critical Application Sales Policy:
Refer to:
http://www.murata-ps.com/requirements/
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
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