NKE Series

Isolated Sub-Miniature 1W Single Output DC/DC Converters

KDC_NKE.K03 Page 2 of 7

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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, 3.3V output types & 0309

10

15

%

10% load to rated load, 5V output types

12

15

10% load to rated load, 9V output types

7.5

10

10% load to rated load, 12V output types

6.5

9.5

10% load to rated load, 15V output types

6.0

8.5

Ripple and Noise

BW=DC to 20MHz, 3.3V output types & 0305, 0505SEC, 0505DEC

40

80

mV p-p

BW=DC to 20MHz, other 5V output types

77

100

BW=DC to 20MHz, 9V output types

43

90

BW=DC to 20MHz, 12V output types

35

65

BW=DC to 20MHz, 15V output types

32

55

ISOLATION CHARACTERISTICS

Parameter

Conditions

Min.

Typ.

Max.

Units

Isolation test voltage

Flash tested for 1 second

3000

VDC

Resistance

Viso= 1000VDC

10

GΩ

GENERAL CHARACTERISTICS

Parameter

Conditions

Min.

Typ.

Max.

Units

Switching frequency

All output types

115

kHz

TEMPERATURE CHARACTERISTICS

Parameter

Conditions

Min.

Typ.

Max.

Units

Specification

All output types

-40

85

°C

Storage

-50

130

Case temperature rise above

ambient

0505D/S, 1205D/S

41

All other output types

32

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 NKE series of dc/dc converters are all 100% production tested at their stated isolation voltage. This is 1000V DC for 1 second.

A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?”

The NKE 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 materi-

als, construction and environment. While manufactured parts can 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.

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

SAFETY APPROVAL

The NKE 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 E179522 applies.