NTE Series

Isolated 1W Single Output SM DC/DC Converters

KDC_NTE.K04 Page 2 of 6

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OUTPUT CHARACTERISTICS

Parameter

Conditions

Min.

Typ.

Max.

Units

Rated power

1.0

W

Voltage set point accuracy

See tolerance envelope

Line regulation

1.0

1.2

%/%

10% load to rated load, 03XXMC, 0503MC, 0505MEC

10

14

%

10% load to rated load, 0505MC & 1205MC

12.8

15

10% load to rated load, 0506MC

9.2

10

10% load to rated load, 0509MC & 1209MC

8.3

9.0

10% load to rated load, 0512MC & 1212MC

6.8

7.5

10% load to rated load, 0515MC & 1215MC

6.3

7.0

Ripple and noise

BW=DC to 20MHz, 03XXMC, 0503MC, 0505MEC

40

60

mV p-p

BW=DC to 20MHz, 0505MC & 1205MC

62

85

BW=DC to 20MHz, 0506MC

103

170

BW=DC to 20MHz, 0509MC & 1209MC

49

75

BW=DC to 20MHz, 0512MC & 1212MC

39

65

BW=DC to 20MHz, 0515MC & 1215MC

38

76

TEMPERATURE CHARACTERISTICS

Parameter

Conditions

Min.

Typ.

Max.

Units

Specification

All output types

-40

85

°C

Storage

-55

125

Case temperature rise above

ambient

0305MC, 0309MC, 0315MC

25

0303MC, 0312MC, 0503MC, 0505MEC, 0509MC, 0512MC, 0515MC

30

0505MC, 1205MC

43

1209MC, 1212MC, 1215MC

40

Cooling

Free air convection

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 NTE series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second.

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 NTE 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 NTE 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.

1. 12V input types have typically 3% less load regulation change.

TEMPERATURE DERATING GRAPH

150

100

50

0

-40

0

0.5

1.0

1.5

Safe Operating Area

85°C

Ambient Temperature (°C)