MEV3 View Datasheet(PDF) - Murata Manufacturing

Part Name

Description

Manufacturer

MEV3

3kVDC Isolated 3W Single Output DC/DC Converters

Murata Manufacturing 

MEV3 Series

3kVDC Isolated 3W Single Output DC/DC Converters

TEMPERATURE DERATING GRAPH

4.5

3.0

85°C

OUTPUT VOLTAGE TOLERANCE ENVELOPE

5%

VNOM

Typical Load Line

2%

0%

1.5 Safe Operating Area

0

-40 0 50 100 150

Ambient Temperature (°C)

-4%

10 25

50

75 100

Output Load Current (%)

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.

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 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?”

The MEV3 series has been recognized 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 sys-

tem. 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 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

The MEV3 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 MEV3 Series of converters are not internally fused so to meet the requirements of UL 60950 an input line fuse should always be used. An anti-surge 2.5A should be used for

MEV3S05xxSC models, and an anti-surge 1A should be used for MEV3S12xxSC models. All fuses should be UL approved and rated to at least the maximum allowable DC input

voltage.

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 finish 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

www.murata-ps.com/support

KDC_MEV3.C01 Page 2 of 7

Share Link: