1. Calculated using MIL-HDBK-217 FN2 calculation model with nominal input voltage at full load.
2. See ripple & noise test method.
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
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KDC_NMJ.H01
Page 1 of 6
NMJ Series
5.2kVDC Isolated 1W DC/DC Converters
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Resistance
Conditions
Flash tested for 1 second
Viso= 500VDC
Min.
5200
Typ.
1
Max.
Units
VDC
GΩ
GENERAL CHARACTERISTICS
Parameter
Switching frequency
Conditions
Single output
Dual output
Min.
Typ.
45
70
Max.
Units
kHz
TEMPERATURE CHARACTERISTICS
Parameter
Specification
Storage
Case Temperature above ambient
Cooling
Conditions
All output types, see safety approval section for UL temperature specification
All output types
Free air convection
Min.
-40
-55
Typ.
Max.
85
130
33
Units
°C
TEMPERATURE DERATING GRAPH
1.5
Output Power (W)
1.0
0.5
0
-40
Safe Operating Area
85ºC
0
40
Ambient Temperature (ºC)
90
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 NMJ series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 5.2kVDC for 1 second.
A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”
The NMJ series has been recognized by Underwiters Laboratory to 300Vrms for Supplementary Insulation and 150Vrms for Reinforced Insulation.
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. 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.
SAFETY APPROVAL
The NMJ series has been recognised by Underwriters Laboratory (UL) to UL 60950 for supplementary insulation up to 300Vrms and reinforced insulation up to 150Vrms at a
maximum ambient temperature of 75ºC, measured on the side opposite the pins. 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
www.murata-ps.com/support
KDC_NMJ.H01
Page 2 of 6
NMJ Series
5.2kVDC Isolated 1W DC/DC Converters
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%.
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.
Start-up time
μs
2530
7865
13080
21560
2770
20455
14475
22300
530
576
Start-up time
μs
1059
3454
7980
11505
1286
3548
7355
11535
Typical Start-Up Wave Form
NMJ0505SC
NMJ0509SC
NMJ0512SC
NMJ0515SC
NMJ1205SC
NMJ1209SC
NMJ1212SC
NMJ1215SC
NMJ0303SAC
NMJ0503SAC
NMJ0505SAC
NMJ0509SAC
NMJ0512SAC
NMJ0515SAC
NMJ1205SAC
NMJ1209SAC
NMJ1212SAC
NMJ1215SAC
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test configuration.
C1
1μF X7R multilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter
10μF tantalum capacitor, voltage rating to be a minimum of 1.5 times the output voltage of the DC/DC converter with an ESR of less
C2
than 100mΩ at 100 kHz
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
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KDC_NMJ.H01
Page 3 of 6
NMJ Series
5.2kVDC Isolated 1W DC/DC Converters
APPLICATION NOTES (continued)
Output Ripple Reduction
By using the values of inductance and capacitance stated, the output ripple at the rated load is lowered to 5mV p-p max.
Component selection
Capacitor: It is required that the ESR (Equivalent Series Resistance) should be as low as possible, ceramic types are recommended.
The voltage rating should be at least twice (except for 15V output), the rated output voltage of the DC/DC converter.
Inductor: The rated current of the inductor should not be less than that of the output of the DC/DC converter. At the rated current, the DC resistance of the inductor should
be such that the voltage drop across the inductor is <2% of the rated voltage of the DC/DC converter. The SRF (Self Resonant Frequency) should be >20MHz.
L
Power
Source
DC
C
Load
DC
Inductor
Through Hole
22R223C
22R223C
22R473C
22R224C
22R224C
Capacitor
C, μF
4.7
4.7
2.2
0.47
0.47
3.3V single output types
5V single output types
9V single output types
12V single output types
15V single output types
L, μH
22
22
47
220
220
SMD
82223C
82223C
82473C
82224C
82224C
+V
OUT
Power
Source
L
C
Load
Load
DC
DC
OV
C
-V
OUT
L
w
5V dual output types
9V dual output types
12V dual output types
15V dual output types
L, μH
22
47
220
220
Inductor
Through Hole
22R223C
22R473C
22R224C
22R224C
SMD
82223C
82473C
82224C
82224C
Capacitor
C, μF
4.70
2.2
0.47
0.47
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KDC_NMJ.H01
Page 4 of 6
NMJ Series
5.2kVDC Isolated 1W DC/DC Converters
TOLERANCE ENVELOPES
The voltage tolerance envelopes show typical load regulation characteristics for this product series. The tolerance envelope is the maximum output voltage variation due to
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