Datasheet

NKE Series
Isolated Sub-Miniature 1W Single Output DC/DC Converters
KDC_NKE.K07 Page 2 of 7
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OUTPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Rated Power TA=-40°C to 120°C, see derating graphs 1.0 W
Voltage Set Point Accuracy See tolerance envelope
Line regulation High V
IN to low VIN 1.0 1.2 %/%
Load Regulation
1
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 3000V 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 E151252 applies.