supplies on primarily digital boards with the added
benefit of galvanic isolation to reduce switching
noise. Surface mount technology and advanced
packaging materials produce rugged reliable
performance over an extended temperature range
from -40ºC to 85ºC. For the NMR100PC protection
is continuous and auto-resetting on removal of the
short circuit.
Input short circuit current
Input reflected ripple
current
mA
mA p-p
OUTPUT CHARACTERISTICS
Parameter
Rated Power
2
Voltage Set Point Accuracy
Line regulation
Conditions
T
A
=-40°C to 85°C, See derating graph
See tolerance envelope
High V
IN
to low V
IN
; Short circuit types
High V
IN
to low V
IN
; All other output types
Min.
Typ.
Max.
1.0
Units
W
1.15
1.0
1.2
1.2
%/%
ISOLATION CHARACTERISTICS
Parameter
Isolation voltage
Resistance
Conditions
Flash tested for 1 second
Viso=1000VDC
Min.
1000
10
260°C
7V
15V
18V
28V
Typ.
Max.
Units
VDC
GΩ
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds
Input voltage V
IN
, NMR100C, NMR101C, NMR102C
Input voltage V
IN
, NMR106C, NMR107C, NMR108C
Input voltage V
IN
, NMR112C, NMR113C, NMR114C
Input voltage V
IN
, NMR118C, NMR119C, NMR120C
For full details go to
www.murata-ps.com/rohs
1. Calculated using MIL-HDBK-217 FN2 and Telcordia SR-332 calculation model with nominal input voltage at full load.
2. See derating graph.
3. See ripple & noise characterisation method.
All specifications typical at T
A
=25°C, nominal input voltage and rated output current unless otherwise specified.
www.murata-ps.com/support
KDC_NMR.F01
Page 1 of 10
NMR Series
Isolated 1W Single Output DC/DC Converters
GENERAL CHARACTERISTICS
Parameter
Conditions
5V input types
12V input types
15V input types
24V input types
Short circuit types
Min.
Typ.
110
160
90
80
97
Max.
Units
Switching frequency
kHz
TEMPERATURE CHARACTERISTICS
Parameter
Specification
Storage
Case Temperature above ambient
Cooling
Conditions
All output types
5V output types
All other output types
Short circuit types
Free air convection
Min.
-40
-50
Typ.
Max.
85
130
Units
33
28
18
°C
TOLERANCE ENVELOPES
NMR118
+7%
+4%
+2%
V
NOM
NMR113, NMR 114, NMR119, NMR120
Output Voltage
Output Voltage
0%
-5%
V
NOM
+1%
-3%
10
75
50
25
Output Load Current (%)
100
10
75
50
25
Output Load Current (%)
100
All other output types:
+10%
Short circuit types:
+10%
Output Voltage
Output Voltage
+2.5%
V
NOM
-7.5%
10
25
50
75
100
+5%
V
NOM
0%
-6%
10
25
50
75
100
Output Load Current (%)
Output Load Current (%)
The voltage tolerance envelope shows typical load regulation characteristics for this product series. The tolerance envelope is the maximum output voltage variation due to
changes in output loading.
www.murata-ps.com/support
KDC_NMR.F01
Page 2 of 10
NMR Series
Isolated 1W Single Output DC/DC Converters
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 NMR 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?”
The NMR is recognised by Underwriters Laboratory for functional insulation, 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 materials,
construction and environment. The NMR 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.
SAFETY APPROVAL
UL60950
The NMR series is recognised by Underwriters Laboratory (UL) to UL 60950 for functional insulation in a maximum still air ambient temperature of 100°C as measured at any point
on the case of the unit (hotspot).
FUSING
The NMR Series of converters are not internally fused so to meet the requirements of UL an anti-surge input line fuse should always be used with ratings as defined below.
Input Voltage, 5V 0.5A
Input Voltage, 12V 0.25A
Input Voltage, 24V 0.12A
All fuses should be UL recognized, 125V rated.
File number E151252 applies.
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature of 260ºC for 10 seconds. The pin termination finish
on this product series is Tin Plate, Hot Dipped over Matte Tin with Nickel Preplate. The series is backward compatible with Sn/Pb soldering
systems.
For further information, please visit www.murata-ps.com/rohs
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