NML0505SC 查看數據表（PDF） - Murata Power Solutions
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NML0505SC Datasheet PDF : 5 Pages
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NML Series
Isolated 2W Single Output DC/DC Converters
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
3
2
85°C
1 Safe Operating Area
0
-40 0 50 100 150
Ambient Temperature (°C)
Min.
Typ.
Max.
Units
90
kHz
90
Min.
Typ.
Max.
Units
-40
85
-50
130
°C
45
36
TOLERANCE ENVELOPE
+10%
+5%
VNOM
Typical Load Line
+2.5%
-2.5%
-7.5%
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 variation 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 NML 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?”
The NML series has been recognised 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
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 materi-
als, construction and environment. The NML 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 lim-
ited. 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 recognised 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 NML 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 100ºC as measured at any point on the case of the unit (hotspot).
The NML series of converters are not internally fused so to meet the requirements of UL 60950 an anti-surge input line fuse should always be used with ratings as defined below.
NML05xxSC: 0.8A
NML12xxSC: 0.315A
All fuses should be UL recognized and rated to 125V. File number E151252 applies.
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KDC_NML.F01 Page 2 of 5
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