3kVDC Isolated 1W Single & Dual Output DC/DC Converters
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
2
Lead temperature 1.5mm from case for 10 seconds
Input voltage V
IN
, NMV24 types
Input voltage V
IN,
NMV48 types
1 second
300°C
28V
54V
OUTPUT CHARACTERISTICS
Parameter
Rated Power
Voltage Set Point Accuracy
Line regulation
1
Conditions
T
A
=0
°C
to 70
°C
See tolerance envelope
High V
IN
to low V
IN
Min.
Typ.
Max.
1
1.2
Units
W
%/%
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Resistance
Conditions
Flash tested for 1 minute
Viso= 1000VDC
Min.
3000
1
Typ.
Max.
Units
VDC
GΩ
GENERAL CHARACTERISTICS
Parameter
Switching frequency
Conditions
All input types
Min.
Typ.
100
Max.
Units
kHz
TEMPERATURE CHARACTERISTICS
Parameter
Specification
Storage
Cooling
Conditions
All output types
Free air convection
Min.
0
-55
Typ.
Max.
70
150
Units
°C
TEMPERATURE DERATING GRAPH
1.5
TOLERANCE ENVELOPE
+10%
70°C
+5%
V
NOM
Output Power (W)
Typical
L
1.0
0.5
0
oad Line
+2.5%
-2.5%
-7.5%
Safe Operating
Area
0
150
50
100
Ambient Temperature (°C)
Output Voltage
10
75
50
25
Output Load Current (%)
100
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 NMV 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 NMV 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 NMV 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.
近期，中国科学院合肥物质科学研究院固体物理研究所研究员费广涛课题组在柔性应变传感器的制备及力敏特性研究方面取得新进展，相关研究成果以Flexible strain sensor with high performance based on PANI/PDMS films 为题发表在Organic Electronics（47 (2017) 51-56）杂志上。 随着科学技术的快速发展...[详细]
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