NDTS Series
Isolated 3W Single Output DC/DC Converters
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
8 Hours
Lead temperature 1.5mm from case for 10 seconds
Minimum output load for specification3
Input voltage 05 types
300°C
25% of rated output
10V
Input voltage 12 types
20V
Input voltage 24 types
40V
Input voltage 48 types
80V
Free air space
10mm Min. around component
GENERAL CHARACTERISTICS
Parameter
Conditions
Min.
70
Typ.
Typ.
Max.
650
Units
kHz
Switching frequency
100% to 25% load, VIN Min. to Max.
ISOLATION CHARACTERISTICS
Parameter
Isolation voltage
Conditions
Flash tested for 1 second
Resistance
Min.
1000
1
Max.
Units
VDC
GΩ
Resistance
TEMPERATURE CHARACTERISTICS
Parameter
Operation
Storage
Conditions
Min.
-40
Typ.
30
Max.
85
Units
ºC
-50
130
NDTS0515C, NDTS1205C, NDTS1212C, NDTS1215C, NDTS2405C,
NDTS2412C, NDTS2415C, NDTS4812C & NDTS4815C
Case temperature rise above ambient
in still air
NDTS0505C, NDTS0512C, NDTS1203C, NDTS2403C, NDTS4803C &
NDTS4805C
40
50
NDTS0503C
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 NDTS 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?”
For a part holding no specific agency approvals, such as the NDTS 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 NDTS series has an EI ferrite core, 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.
RoHS COMPLIANCE INFORMATION
This series is compatible with RoHS soldering systems with a peak wave solder
temperature of 300ºC for 10 seconds. The pin termination finish on this product series
is Tin. The series is backward compatible with Sn/Pb soldering systems.
For further information, please visit www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232
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