Datasheet

MTE1 Series
Isolated 1W Single Output SM DC/DC Converters
KDC_MTE1.B04 Page 2 of 11
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OUTPUT CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Rated power TA=-40°C to 85°C 1.0 W
Voltage set point accuracy See tolerance envelope
Line regulation High V
IN to low VIN 1.1 1.2 %/%
Ripple and noise BW=DC to 20MHz 25 70 mV p-p
TEMPERATURE CHARACTERISTICS
Parameter Conditions Min. Typ. Max. Units
Specification All output types -40 85
°C
Storage -50 130
Case temperature rise above ambient All output types
12.5 20
Cooling Free air convection
TECHNICAL NOTES
ISOLATION VOLTAGE
‘Hi Pot Test’, ‘Flash Tested’, ‘Withstand Voltage’, ‘Proof Voltage’, ‘Dielectric Withstand Volt-
age’ & ‘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 MTE1 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 MTE1 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 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 bar-
rier 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 MTE1 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 test-
ing, 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 func-
tional isolation where the wire enamel insulation is always supplemented by a further
insulation system of physical spacing or barriers.
TEMPERATURE DERATING GRAPH
150100
50
0
-40
0
0.5
1.0
1.5
Safe Operating Area
85°C
Ambient Temperature (°C)
Output Power (W)
SAFETY APPROVAL
The MTE1 series has been recognized by Underwriters Laboratory (UL) to UL 60950 for functional insulation in a maximum ambient temperature for 3.3V & 5V input models of
60°C and for 12V, 15V and 24V models of 85°C. File number E151252 applies. The MTE1 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.
MTE1S03xxxC: 1A
MTE1S05xxxC: 0.7A
MTE1S12xxxC: 0.2A
MTE1S15xxxC: 0.2A
MTE1S24xxxC: 0.16A
All fuses should be UL approved and rated to at least the maximum allowable DC input voltage.