MEV3 Series
3kVDC Isolated 3W Single Output DC/DC Converters
KDC_MEV3C.A01 Page 1 of 5
Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232www.murata-ps.com
For full details go to
www.murata-ps.com/rohs
SELECTION GUIDE
Order Code
Nominal Input
Voltage
Output
Voltage
Output Current
Input Current at
Rated Load
Load Regulation
(Typ)
Load Regulation
(Max)
Ripple & Noise
(Typ)1
Ripple & Noise
(Max)1
Effi ciency (Min.)
Effi ciency (Typ.)
Isolation
Capacitance
MTTF2
V V mA mA % mVp-p % % pF kHrs
MEV3S0505SC 5 5 600 700 6.8 8 39 50 81.5 83 28 6029
MEV3S0509SC 5 9 333 680 5.5 7 24 35 85.3 87 43 5163
MEV3S0512SC 5 12 250 700 5 7 20 35 81.5 85.5 32 5995
MEV3S0515SC 5 15 200 700 5 6 18 30 85 87.5 40 5426
MEV3S1205SC 12 5 600 300 4.5 6 34 50 81.5 84 34 6063
MEV3S1209SC 12 9 333 280 3.6 5 22 35 85.5 87.5 50 6056
MEV3S1212SC 12 12 250 280 3.2 4.5 16 30 86 88 63 6572
MEV3S1215SC 12 15 200 280 2.8 4 13 30 87 89 70 5754
INPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Voltage range Continuous operation, 5V input types 4.5 5 5.5 V
Continuous operation, 12V input types 10.8 12 13.2
Refl ected ripple current 5V input types 8 18 mA p-p
12V input types 6.5 15
OUTPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Rated Power TA=-40°C to 85°C 3W
Voltage Set Point Accuracy See tolerance envelope
Line regulation High VIN to low VIN 1.01 1.1 %/%
ISOLATION CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Isolation test voltage Flash tested for 1 minute 3000 VDC
Resistance Viso= 1000VDC 10 GΩ
GENERAL CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Switching frequency 60 kHz
TEMPERATURE CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Specifi cation All output types -40 85
°C
Storage -50 125
Case Temperature rise
above ambient
MEV3S0505SC 37
All other types 35
Cooling Free air convection
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds 260°C
Internal power dissipation 700mW
Input voltage VIN, MEV05 types 7V
Input voltage VIN, MEV12 types 15V
PRODUCT OVERVIEW
The MEV3 series is a new range of high
performance 3W DC/DC converters, offering 3W
of available output power in a previously rated
2W package capable of operation over the full
industrial temperature range of -40ºC to 85ºC.
Available in an industry standard SIP package,
with a pin compatible power upgrade path from
the 1W NMV/MEV and 2W NMK series’, they
are ideally suited for providing local supplies on
control system boards with the added benefit of
3kVDC galvanic isolation.
FEATURES
RoHS compliant
Typical effi ciency from 83%
Power density 1.9W/cm3
Wide temperature performance at full
3 Watt load, –40°C to 85°C
UL 94V-0 package material
No heatsink required
Industry standard pinout
3kVDC isolation (1 minute)
5V & 12V input
5V, 9V, 12V, & 15V output
Fully encapsulated with toroidal
magnetics
No external components required
No electrolytic or tantalum capacitors
UL 60950 recognition pending
1. See Ripple & Noise characterisation method.
2. Calculated using MIL-HDBK-217F FN2 with nominal input voltage at full load.
All specifi cations typical at TA=25°C, nominal input voltage and rated output current unless otherwise specifi ed.
MEV3 Series
3kVDC Isolated 3W Single Output DC/DC Converters
KDC_MEV3C.A01 Page 2 of 5
Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232www.murata-ps.com
TEMPERATURE DERATING GRAPH OUTPUT VOLTAGE TOLERANCE ENVELOPE
The voltage tolerance envelope shows typical load regulation characteristics for
this product series. The tolerance envelope is the maximum output voltage varia-
tion due to changes in output loading.
Output Load Current (%)
egatloV tu
ptuO
VNOM
5%
0%
-4%
2%
Typical Load Line
100
75
50
25
10
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 specifi ed time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.
Murata Power Solutions MEV3 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?”
For a part holding no specifi c agency approvals, such as the MEV3 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 materials,
construction and environment. The MEV3 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 specifi ed 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.
RoHS COMPLIANT INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder temperature of
260°C for 10 seconds. The pin termination fi nish on the SIP package type is Tin Plate, Hot Dipped
over Matte Tin with Nickel Preplate. They are backward compatible with Sn/Pb soldering systems.
For further information, please visit www.murata-ps.com/rohs
150100
50
0
-40
0
1.5
3.0
4.5
Safe Operating Area
85°C
Ambient Temperature (°C)
Output Power (W)
MEV3 Series
3kVDC Isolated 3W Single Output DC/DC Converters
KDC_MEV3C.A01 Page 3 of 5
Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232www.murata-ps.com
APPLICATION NOTES
Minimum load
The minimum load to meet datasheet specifi cation is 10% of the full rated load across the specifi ed input voltage range. Lower than 10% minimum loading will result in
an increase in output voltage, which may rise to typically double the specifi ed 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.
Ripple & Noise Characterisation Method
Ripple and noise measurements are performed with the following test confi guration.
C1 1µF X7R m ultilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter
C2 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
than 100m at 100 kHz
C3 100nF multilayer ceramic capacitor, general purpose
R1 450 resistor, carbon fi 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 specifi ed values.
Differential Mode Noise Test Schematic
OSCILLOSCOPE
Y INPUT
SUPPLY
C1 C2 C3 R1 T1 R2
Input Output
DC/DC Converter
R LOAD
+
+
-
-
Start-up time
µs
MEV3S0505SC 165
MEV3S0509SC 300
MEV3S0512SC 650
MEV3S0515SC 1200
MEV3S1205SC 75
MEV3S1209SC 200
MEV3S1212SC 350
MEV3S1215SC 410
Typical Start-Up Wave Form
MEV3 Series
3kVDC Isolated 3W Single Output DC/DC Converters
KDC_MEV3C.A01 Page 4 of 5
Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232www.murata-ps.com
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.
EFFICIENCY VS LOAD
MEV3505xxSC Input Voltage MEV3512XXSC Input Voltage
DC
DC
L
CLoad
Power
Source
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100
Load (%)
Efficiency (%)
5V
9V
12V
15V
0
10
20
30
40
50
60
70
80
90
0 102030405060708090100
Load (%)
Efficiency (%)
5V
9V
12V
15V
Inductor Capacitor
L, µH SMD Through Hole C, µF
MEV3S0505SC 10 84103C 11R103C 4.7
MEV3S0509SC 22 84223C 11R223C 2.2
MEV3S0512SC 47 84473C 11R473C 1
MEV3S0515SC 47 84473C 11R473C 1
MEV3S1205SC 10 84103C 11R103C 4.7
MEV3S1209SC 22 84223C 11R223C 2.2
MEV3S1212SC 47 84473C 11R473C 1
MEV3S1215SC 47 84473C 11R473C 1
MEV3 Series
3kVDC Isolated 3W Single Output DC/DC Converters
KDC_MEV3C.A01 Page 5 of 5
Technical enquiries email: mk@murata-ps.com, tel: +44 (0)1908 615232www.murata-ps.com
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. Specifi cations are subject to change without
notice. © 2009 Murata Power Solutions, Inc.
USA: Mansfi eld (MA), Tel: (508) 339 3000, email: sales@murata-ps.com
Canada: Toronto, Tel: (866) 740 1232, email: toronto@murata-ps.com
UK: Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com
France: Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com
Germany: München, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com
Japan: Tokyo, Tel: 3-3779-1031, email: japan@murata-ps.com
Kyoto, Tel: 81-75-955-7269, email: japan@murata-ps.com
China: Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com
Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com
Singapore: Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A.
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 & ISO 14001 REGISTERED
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS RECOMMENDED FOOTPRINT DETAILS
TUBE OUTLINE DIMENSIONS
PIN CONNECTIONS
Pin Function
1+VIN
2-VIN
5-VOUT
7+VOUT
Unless otherwise stated, 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.
Weight: 2.9g
0.1 (2.54)
0.1 (2.54)
Ø
4 HOLES
0.00394 (0.1)
0.045 (1.15)
0.040 (1.00)
Unless otherwise stated all dimensions in inches (mm) ±0.5mm.
Tube length : 20.47 (520mm ±2mm).
Tube Quantity : 25
Unless otherwise stated all dimensions in inches (mm) ±0.5mm.
12 5 7
0.774 (19.65) (Max.)
0.301
(7.65)
(Max.)
0.4
(10.15)
(Max.)
0.181 (4.60)
0.142 (3.60)
0.0118 (0.30)
0.0079 (0.20)
0.6 (15.24)
0.057 (1.45)
0.039 (1.00)
0.099 (2.52)
0.061 (1.54)
0.0016
(0.40) Min.
0.1 (2.54)
MEV3S0505SC
XYYWW
0.50 (0.020)
