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NTV0505MC

3kVDC Isolated 1W Dual Output SM DC/DC Converters

Murata Power Solutions 

ISOLATION CHARACTERISTICS

Parameter

Conditions

Isolation test voltage

Flash tested for 1 minute

Resistance

Viso= 1000VDC

GENERAL CHARACTERISTICS

Parameter

Conditions

Switching frequency

5V input types

12V input types

TEMPERATURE CHARACTERISTICS

Parameter

Conditions

Specification

All output types

Storage

5V output types

Case temperature above ambient

All other output types

Cooling

Free air convection

TEMPERATURE DERATING GRAPH

1.5

1.0

85°C

0.5 Safe Operating Area

NTV Series

3kVDC Isolated 1W Dual Output SM DC/DC Converters

Min.

Typ.

Max.

Units

3000

VDC

10

GΩ

Min.

Typ.

Max.

Units

115

kHz

120

Min.

Typ.

Max.

Units

-40

85

-55

125

°C

33

25

TOLERANCE ENVELOPE

+10%

+5%

V

NOM

Typical Load Line

+2.5%

-2.5%

-7.5%

0

-40 0 50 100 150

Ambient Temperature (°C)

10 25

50

75 100

Output Load Current (%)

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, ap-

plied for a specified time, across a component designed to provide electrical isolation, to verify the integrity of that isolation.

Murata Power Solutions NTV 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 specific agency approvals, such as the NTV 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 NTV 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 there-

fore 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 insula-

tion system of physical spacing or barriers.

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%.

www.murata-ps.com/support

KDC_NTV.F02 Page 2 of 4

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