NXE2 Series
www.murata-ps.com
Isolated 2W Single Output SM DC/DC Converters
SELECTION GUIDE
1
Order Code
MIL. Tel.
V V mA mA % % mVp-p mVp-p % % pF kHrs
NXE2S0505MC 5 5 542 400 9 12 55 85 68.5 72 2.1 1853 18868
FEATURES
NXE2S1205MC 12 5 220 400 11 12 50 85 74.5 77 2.1 1800 46838
Patents pending
NXE2S1212MC 12 12 210 167 7 8.5 25 55 74.5 76.5 2.1 1848 22472
Lower Prole
NXE2S1215MC 12 15 205 133 8.5 11 30 60 76 79 2.1 1631 58568
UL60950 Recognition pending
INPUT CHARACTERISTICS
ANSI/AAMI ES60601-1 Recognition
Parameter Conditions Min. Typ. Max. Units
pending
Continuous operation, 5V input types 4.5 5 5.5
Voltage range V
Continuous operation, 12V input types 10.8 12 13.2
3kVDC Isolation Hi Pot Test
NXE2S0505MC 4
Substrate Embedded Transformer
Input reected ripple NXE2S1205MC 2.5
mA p-p
Automated Manufacture current NXE2S1212MC 3.3
NXE2S1215MC 2.8
Industry Standard Footprint
ISOLATION CHARACTERISTICS
3
Short Circuit Protection
Parameter Conditions Min. Typ. Max. Units
Production tested for 1 second 3000
Halogen Free
Isolation voltage VDC
Qualication tested for 1 minute 3000
Resistance Viso= 1000VDC 10 G
PRODUCT OVERVIEW
GENERAL CHARACTERISTICS
The NXE2 series is a new range of low cost, lower
Parameter Conditions Min. Typ. Max. Units
prole, fully automated manufacture surface
NXE2S0505MC 130
mount DC/DC converters. The NXE2 series
NXE2S1205MC 100
automated manufacturing process with substrate Switching frequency kHz
NXE2S1212MC 115
embedded transformer, offers increased product
NXE2S1215MC 100
reliability and repeatability of performance in a
OUTPUT CHARACTERISTICS
halogen free, iLGA inspectable package. The NXE2
Parameter Conditions Min. Typ. Max. Units
series, industry standard footprint is compatible
Rated power TA=-40C to 85C 2.0 W
with existing designs.
Voltage set point accuracy See tolerance envelopes
High VIN to low VIN, All other variants 1.15 1.2
The NXE2 series has a MSL rating 2, and is com-
4
Line regulation %/%
High VIN to low VIN ,1205 variant 1.15 1.26
patible with a peak reow solder temperature of
245 C as per J-STD-020 and J-STD-075.
TEMPERATURE CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Specication See derating graphs -40 85
Storage -50 125
NXE2S0505MC 36
C
NXE2S1205MC 32
Case temperature rise above ambient
NXE2S1212MC 28
NXE2S1215MC 27
Cooling Free air convection
ABSOLUTE MAXIMUM RATINGS
Input voltage VIN, NXE2S05 types 7V
Input voltage VIN, NXE2S12 types 15V
1. Components are supplied in tape and reel packaging, please refer to package specication section. Orderable part numbers are
NXE2S0505MC-R7 (180 pieces per reel), or NXE2S0505MC-R13 (800 pieces per reel).
2. Calculated using MIL-HDBK-217 FN2 and Telcordia SR-332 calculation model with nominal input voltage at full load.
3. Please refer to short circuit application notes.
For full details go to
4. NXE2S1205MC line regulation may increase to 2.15 %/% at the operating temperature limits.
www.murata-ps.com/rohs
All specications typical at TA=25C, nominal input voltage and rated output current unless otherwise specied.
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KDC_NXE2.A04 Page 1 of 9
Nominal Input
Voltage
Output Voltage
Input Current
Output Current
Load Regulation
(Typ)
Load Regulation
(Max)
Output Ripple
& Noise (Typ)
Output Ripple
& Noise (Max)
Efciency (Min)
Efciency (Typ)
Isolation
Capacitance
2
MTTFNXE2 Series
Isolated 2W Single Output SM 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 specied time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.
Murata Power Solutions NXE2 series of DC/DC converters are all 100% production tested at 3kVDC for 1 second and have been qualication tested at 3kVDC for 1 minute.
A question commonly asked is, What is the continuous voltage that can be applied across the part in normal operation?
When the insulation in the NXE2 series is not used as a safety barrier , i.e. provides functional isolation only, continuous or switched voltages across the barrier up to 3kV are
sustainable. Long term reliability testing at these voltages continues. Peak Inception voltages measured were in excess of 3.5kV when testing for partial discharge in accordance
with IEC 60270. Please contact Murata for further information.
The NXE2 series is pending recognition by Underwriters Laboratory.
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 NXE2 series has a PCB embedded isolated transformer, using FR4 as an insolation barrier between primary and secondary windings. While parts
can be expected to withstand several times the stated test voltage, the isolation capability does depend on the FR4 insulation properties. Any material, including FR4 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 should be reduced by 20% from specied test voltage.
This consideration equally applies to agency recognized parts rated for better than functional isolation where the insulation is always supplemented by a further insulation system
of physical spacing or barriers.
SAFETY APPROVAL
ANSI/AAMI ES60601-1
The NXE2 series is pending recognition ANSI/AAMI ES60601-1.
UL 60950
The NXE2 series is pending recognition by Underwriters Laboratory (UL) to UL 60950.
FUSING
The NXE2 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 dened below.
Input Voltage, 5V 1A
Input Voltage, 12V 400mA
All fuses should be UL recognized, V rated.
CHARACTERISATION TEST METHODS
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test conguration.
C1 1F X7R m ultilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter
10F 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 100m at 100 kHz
C3 100nF multilayer ceramic capacitor, general purpose
R1 450 resistor, carbon lm, 1% tolerance
R2 50 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 specied values.
Differential Mode Noise Test Schematic
DC/DC Converter
OSCILLOSCOPE
R2
C1 C2 C3 R1 T1
Y INPUT
+ +
SUPPLY Input Output
- -
R LOAD
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KDC_NXE2.A04 Page 2 of 9