NMK Series
www.murata.com
3kVDC Isolated 2W Single & Dual Output DC-DC Converters
NMK0505SAC
NMK0505TSAC
NMK0512SAC
NMK0515SAC
NMK1205SAC
NMK1212SAC
NMK1215SAC
NMK1515SAC
NMK2405SAC
NMK2409SAC
NMK2415SAC
NMK0505SC
NMK0509SC
NMK0512SC
NMK1212SC
NMK1215SC
NMK1515SC
NMK2415SC
5
5
5
5
12
12
12
15
24
24
24
5
5
5
12
12
15
24
5
5
12
15
5
12
15
15
5
9
15
±5
±9
±12
±12
±15
±15
±15
400
400
167
133
400
167
133
133
400
222
133
±200
±111
±83
±83
±67
±67
±67
470
470
450
450
200
190
185
149
99
95
93
470
455
450
190
190
150
93
5.7
5.8
3.8
3.4
4.2
2.4
2.0
2.4
4.2
2.7
2.2
5
3.9
3.7
2.2
1.9
2.0
1.7
7.3
8
5.1
4.5
4.9
2.9
2.4
3.5
5.5
3.5
3
6.2
5.3
4.8
2.7
2.4
3
3
24
25
18
17
25
17
14
20
42
30
34
24
18
14
13
13
14
17
NMK0509SAC
NMK0515SC
NMK1205SC
NMK1209SAC
NMK1209SC
NMK1509SC
NMK1512SC
NMK2409SC
NMK2412SC
5
5
12
12
12
15
15
24
24
9
±15
±5
9
±9
±9
±12
±9
±12
222
±67
±200
222
±111
±111
±83
±111
±83
455
450
200
190
190
153
151
94
93
4.2
3.5
3.4
2.6
2.4
2.4
2.2
2.3
1.9
5.9
5.2
3.9
3.1
2.8
3.5
3
3.5
3
NMK1509SAC
NMK1512SAC
NMK1505SC
NMK2405SC
15
15
15
24
9 222 153
12 167 150
±5 ±200 156
±5 ±200 96
3
2.5
3.7
3.4
4
3.5
5
5
%
%
pF
40
50
20
20
30
23
25
40
70
55
70
40
30
20
20
20
35
35
80
77
83
84
80
85
84
85
80
83
85
81
83
84
84
83
85
85
83
83
87
87
83
88
89
88
84
87
88
83
86
87
87
87
88
89
28
30
36
34
33
62
56
72
41
59
85
28
33
35
53
57
74
86
3998
2995
3328
2855
3532
2246
2020
2220
1618
2032
1558
2324
2158
1931
1821
1574
1404
1581
20
12
21
19
16
19
18
26
24
25
20
30
20
20
35
35
45
45
83
84
80
83
83
82
84
84
85
86
87
84
87
87
86
88
87
89
36
31
35
53
50
47
65
65
82
3718
1655
1952
2417
2021
1957
1515
2571
2134
11117
10279
12903
12888
MEJ2S0509SC
MEJ2D0515SC
MEJ2D1205SC
MEJ2S1209SC
MEJ2D1209SC
MEJ2D1509SC
MEJ2D1515SC
Contact Murata
Contact Murata
21
20
27
30
40
40
50
50
83
84
81
81
86
87
84
84
51
63
43
43
2478
1825
1466
2268
11668
10324
8190
12558
MEJ2S1509SC
MEJ2S1512SC
MEJ2D1505SC
NMH2405SC
mVp-p
Recommended
Alternative
MTTF2
%
Ripple & Noise (Typ)1
Isolation Capacitance
mA
Efficiency (Typ.)
mA
Efficiency (Min.)
Output Current
Input Current at Rated
Load
V
Ripple & Noise (Max)1
Output Voltage
V
Order Code3
Load Regulation (Typ)
Nominal Input Voltage
Load Regulation (Max)
SELECTION GUIDE
MIL. Tel.
kHrs
FEATURES
UL60950 recognised4
RoHS compliant
Efficiency from 77%
Power density 1.31W/cm3
Wide temperature performance at full
2 Watt load, –40°C up to 105°C
UL 94V-0 package material
No heatsink required
Industry standard pinout
3kVDC isolation (1 minute) ‘Hi Pot Test’
5V, 12V, 15V & 24V inputs
5V, 9V, 12V & 15V outputs
Fully encapsulated with toroidal
magnetics
No electrolytic or tantalum capacitors
Pin compatible with MEV1, MEV3 & NMV
series
PRODUCT OVERVIEW
The NMK series of industrial temperature range
DC-DC converters, available in industry standard
SIP packaging offers a power upgrade path from
the 1W NMV series. The un-regulated NMK series
has superior output voltage set point accuracy in
conjunction with excellent load regulation for this
converter type.
Unbalanced loading capabilities on dual output
variants, all of the rated output power may be
drawn from a single output 3.
For full details go to
https://www.murata.com/englobal/products/power/rohs
74887
13067
9838
12177
11155
11747
12750
1. See Ripple & Noise characterisation method.
2. Calculated using MIL-HDBK-217 FN2 and Telcordia SR-332 calculation model with nominal input voltage at full load.
3. See application notes on page 4.
4. The NMK0505TSAC is pending recognition to UL62368-1.
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
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KDC_NMK.L01 Page 1 of 10
NMK Series
3kVDC Isolated 2W Single & Dual Output DC-DC Converters
INPUT CHARACTERISTICS
Parameter
Voltage range
Reflected ripple current
Conditions
Min.
Typ.
Max.
Units
Continuous operation, 5V input types
Continuous operation, 12V input types
Continuous operation, 15V input types
Continuous operation, 24V input types
NMK0505TSAC
NMK2405SAC, NMK2409SAC, NMK2405SC, NMK2409SC
All other variants
4.5
10.8
13.5
21.6
5
12
15
24
5
14
7.5
5.5
13.2
16.5
26.4
V
25
15
mA p-p
Conditions
TA=-40°C to 105°C
Min.
Typ.
Max.
Units
2
W
1.1
1.05
1.2
1.2
%/%
Typ.
Max.
Units
OUTPUT CHARACTERISTICS
Parameter
Rated Power
Voltage Set Point Accuracy
See tolerance envelope
Line regulation
High VIN to low VIN
NMK0505TSAC
All other variants
ISOLATION CHARACTERISTICS
Parameter
Conditions
Min.
Isolation test voltage
Resistance
Flash tested for 1 minute
Viso= 1000VDC
3000
10
Parameter
Conditions
Min.
Switching frequency
NMK0505TSAC
All other variants
VDC
GΩ
GENERAL CHARACTERISTICS
Typ.
Max.
50
60
Units
kHz
TEMPERATURE CHARACTERISTICS
Parameter
Specification
Conditions
Min.
NMK0505TSAC
-40
105
All other output types, see safety approval section for UL temperature
specification
-40
85
Storage
Case Temperature above ambient
Cooling
Typ.
-50
NMK0505TSAC
5V output types & NMK1509SAC (Except NMK1505S(A)C & NMK2405S(A)
NMK1505S(A)C & NMK2405S(A)C
All other output types
Free air convection
Max.
125
Units
°C
22
28
32
25
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds
260°C
Wave Solder
Wave Solder profile not to exceed the profile recommended in IEC 61760-1 Section 6.1.3.
Please refer to application notes for further information.
Input voltage VIN, NMK05 types
Input voltage VIN, NMK12 types
Input voltage VIN, NMK15 types
7V
15V
18V
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KDC_NMK.L01 Page 2 of 10
NMK Series
3kVDC Isolated 2W Single & Dual 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 NMK series of DC-DC converters are all 100% production tested at their stated isolation voltage. This is 3kVDC for 1 minute.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
The NMK series has been 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 NMK series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enamelled 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 recognised 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
The NMK series has been recognised by Underwriters Laboratory (UL) to UL 60950 for functional insulation in a maximum ambient temperature of 85ºC and/or case temperature
limit of 130ºC. Case temperature measured on the face opposite the pins. File number E151252 applies. The NMK0505TSAC is pending recognition to UL62368-1.
The NMK Series of converters are not internally fused so to meet the requirements of UL 60950 an anti-surge input line fuse should always be used as below:
NMK05xxSC/SAC: 2A
NMK12xxSC/SAC: 0.75A
NMK15xxSC/SAC: 0.75A
NMK24xxSC/SAC: 0.375A
RoHS COMPLIANT INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature of 260°C for 10 seconds. Please
refer to application notes for further information. The pin termination finish on the SIP package type is Tin Plate, Hot Dipped
over Matte Tin with Nickel Preplate. The DIP types are Matte Tin over Nickel Preplate. Both types in this series are backward
compatible with Sn/Pb soldering systems. For further information, please visit www.murata-ps.com/rohs
PART NUMBER STRUCTURE
NMK XX XX T S A C
Series name
RoHS compliant
Input voltage
Single output
Output voltage
Package type
Extended
temperature
range
S - SIP
D - DIP
M - Surface mount
Z - ZIP
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KDC_NMK.L01 Page 3 of 10
NMK Series
3kVDC Isolated 2W Single & Dual Output DC-DC Converters
CHARACTERISATION TEST METHODS
Ripple & Noise Characterisation Method
All measurement to be taken with the following components connected to the UUT as detailed below. 50 Ohm coax cable, solder connections one end, BNC plug
at the other end.
C1
1μF X7R multilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC-DC converter
C2
10μF tantalum capacitor rated at minimum 1.5 x the output voltage of the UUT with ESR of less than 100 milliohms at 100 kHz e.g. AVX TPS
series.
C3
100nF multilayer ceramic capacitor, general purpose
R1
450Ω resistor, carbon film, ±1% tolerance
R2
50Ω BNC termination
T1
3T of the coax cable through a ferrite toroid
RLOAD
Resistive load to the maximum power rating of the DC-DC converter. Connections should be made via twisted wires
Measured values are multiplied by 10 to obtain the specified values.
Differential Mode Noise Test Schematic
DC/DC Converter
OSCILLOSCOPE
C1 C2 C3
+
SUPPLY
Input
-
+
R1
T1
R2
Y INPUT
Output
-
R LOAD
APPLICATION NOTES
Minimum Load
The minimum load to meet datasheet specification is 10% of the full rated load across the specified input voltage range. Lower than 10% minimum loading will result in an
increase in output voltage, which may rise to typically double the specified output voltage if the output load falls to less than 5%.
Unbalanced Load
The NMK series offers unbalanced loading capabilities with up to the full 2W available from a single output. However, when operated in this mode there may be a slight
performance decrease in efficiency and load regulation.
Capacitive loading and start up
Typical start up times for this series, with a typical input voltage rise time of 2.2μs and output capacitance of 10μF, are shown in the table below. The product series will
start into a capacitance of 47μF with an increased start time, however, the maximum recommended output capacitance is 10μF.
Typical Start-Up Wave Form
NMK0505TSAC
NMK05XXSAC
NMK12XXSAC
NMK15XXSAC
NMK24XXSAC
NMK05XXSC
NMK12XXSC
Start-up time
μs
110
Start-up time
μs
NMK15XXSC
NMK24XXSC
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KDC_NMK.L01 Page 4 of 10
NMK Series
3kVDC Isolated 2W Single & Dual Output DC-DC Converters
TOLERANCE ENVELOPES
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.
NMK0505TSAC
NMKXXXXSAC
5%
Typical Load Line
2%
1%
-4%
25
10
50
75
Output Load Current (%)
Output Voltage
Output Voltage
6%
Typical Load Line
0%
-4%
25
10
100
2%
50
75
Output Load Current (%)
100
NMKXXXXSC
Output Voltage
5%
Typical Loa
d
0%
Line
1%
-3%
25
10
50
75
Output Load Current (%)
100
TEMPERATURE DERATING GRAPH
NMK0505TSAC:
All other variants:
3
105°C
2
1
0
-40
Safe Operating Area
100
50
0
Ambient Temperature (°C)
150
Output Power (W)
Output Power (W)
3
2
1
0
-40
85°C
Safe Operating Area
100
50
0
Ambient Temperature (°C)
150
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KDC_NMK.L01 Page 5 of 10
NMK Series
3kVDC Isolated 2W Single & Dual Output DC-DC Converters
EFFICIENCY VS LOAD
NMK05XXSAC
NMK12XXSAC
90
90
80
15V
12V
9V
5V
70
60
50
Efficiency (%)
Efficiency (%)
80
40
30
70
15V
12V
9V
5V
60
50
40
30
20
20
10
10
0
0
0
10
20
30
40
50
60
70
80
90
0
100
10
20
30
40
50
60
70
80
90
100
110
Load (%)
Load (%)
NMK15XXSAC
NMK24XXSAC
90
90
80
80
70
15V
12V
9V
5V
60
50
40
Efficiency (%)
Efficiency (%)
70
30
60
40
30
20
20
10
10
0
15V
12V
9V
5V
50
0
0
10
20
30
40
50
60
Load (%)
70
80
90
100
0
110
10
20
30
60
70
80
90
100
70
80
90
NMK12XXSC
90
90
80
80
15V
12V
9V
5V
70
60
50
15V
12V
9V
5V
70
Efficiency (%)
Efficiency (%)
50
Load (%)
NMK05XXSC
40
30
60
50
40
30
20
20
10
0
40
10
0
10
20
30
40
50
Load (%)
60
70
80
90
100
0
0
10
20
30
40
50
60
100
Load (%)
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KDC_NMK.L01 Page 6 of 10
NMK Series
3kVDC Isolated 2W Single & Dual Output DC-DC Converters
EFFICIENCY VS LOAD (Continued)
NMK15XXSC
90
80
80
70
70
50
Efficiency (%)
15V
12V
9V
5V
60
Efficiency (%)
NMK24XXSC
90
40
30
60
40
30
20
20
10
10
0
0
10
20
30
40
50
60
Load (%)
70
80
90
100
15V
12V
9V
5V
50
0
110
0
10
20
30
40
50
60
Load (%)
70
80
90
100
110
NMK0505TSAC
90
80
70
Efficiency (%)
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
80
90
100
110
Load (%)
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KDC_NMK.L01 Page 7 of 10
NMK Series
3kVDC Isolated 2W Single & Dual Output DC-DC Converters
EMC FILTERING AND SPECTRA
FILTERING
The following filter circuit and filter table shows the input filters typically required to meet conducted emissions limits for EN 55022 curve B using Quasi-Peak and average
detectors according to CISPR 22.
L
DC
C
DC
Inductor
Capacitor
Part Number
L, μH
SMD
C, μF
SMD
NMK0505TSAC
10μH
23100C
2.2μF
GRM188C71E225KE11D
NMK0505TSAC (Average)
80
80
70
70
60
60
50
50
dBuV
dBuV
NMK0505TSAC (Quasi-Peak)
40
40
30
30
20
20
10
10
0
1.00E+05
1.00E+06
1.00E+07
Frequency (Hz)
1.00E+08
0
1.00E+05
1.00E+06
1.00E+07
1.00E+08
Frequency (Hz)
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KDC_NMK.L01 Page 8 of 10
NMK Series
3kVDC Isolated 2W Single & Dual Output DC-DC Converters
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
PIN CONNECTIONS
Single output variants
Pin
Function
1
2
5
7
NMKXXXXSC
+VIN
-VIN
-VOUT
+VOUT
Dual output variants
Pin
Function
1
2
5
6
7
+VIN
-VIN
-VOUT
OV
+VOUT
TUBE OUTLINE DIMENSIONS
XYYWW
9.3 [0.366]
*
12.43 [0.489]
18.0 [0.709]
5.0 [0.197]
* Pin not fitted on single output variants.
All dimensions in mm (inches) Controlling dimension is mm.
All pins on a 2.54 (0.100) pitch and within ±0. l (0.004) of true position from pin l at seating plane ‘S’
Weight: 2.8g
Unless otherwise stated all dimensions in mm (inches) ±0.5mm.
Tube length : 520mm ±2mm (20.47).
Tube Quantity : 25
RECOMMENDED FOOTPRINT DETAILS
*
* Hole not required for single output variants.
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KDC_NMK.L01 Page 9 of 10
NMK Series
3kVDC Isolated 2W Single & Dual Output DC-DC Converters
DISCLAIMER
Unless otherwise stated in the datasheet, all products are designed for standard commercial and industrial applications and NOT for safety-critical and/or life-critical
applications.
Particularly for safety-critical and/or life-critical applications, i.e. applications that may directly endanger or cause the loss of life, inflict bodily harm and/or loss or severe
damage to equipment/property, and severely harm the environment, a prior explicit written approval from Murata is strictly required. Any use of Murata standard products for any safety-critical, life-critical or any related applications without any prior explicit written approval from Murata shall be deemed unauthorised use.
These applications include but are not limited to:
•
Aircraft equipment
•
Aerospace equipment
•
Undersea equipment
•
Power plant control equipment
•
Medical equipment
•
Transportation equipment ( automobiles, trains, ships, etc.)
•
Traffic signal equipment
•
Disaster prevention / crime prevention equipment
•
Data Processing equipment
Murata makes no express or implied warranty, representation, or guarantee of suitability, fitness for any particular use/purpose and/or compatibility with any application or device of the buyer, nor does Murata assume any liability whatsoever arising out of unauthorised use of any Murata product for the application of the buyer. The
suitability, fitness for any particular use/purpose and/or compatibility of Murata product with any application or device of the buyer remain to be the responsibility and
liability of the buyer.
Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards that anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause harm, and take appropriate remedial actions. Buyer will fully indemnify and hold
Murata, its affiliated companies, and its representatives harmless against any damages arising out of unauthorised use of any Murata products in any safety-critical and/
or life-critical applications.
Remark: Murata in this section refers to Murata Manufacturing Company and its affiliated companies worldwide including, but not limited to, Murata Power Solutions.
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: https://www.murata.com/en-eu/products/power/requirements
Murata Power Solutions (Milton Keynes) Ltd. 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 notice.
© 2022 Murata Power Solutions (Milton Keynes) Ltd.
www.murata.com
KDC_NMK.L01 Page 10 of 10