Isolated 12W 4:1 Input Single & Dual Output DC/DC Converters
Load Regulation Positive Negative Positive Negative Output Typical Max %
FEATURES
UL 60950 recognition pending 4:1 Wide range voltage input Operating temperature range to 85�C Typical load regulation from 0.05% 1.5kVDC Isolation & 15V outputs UL 94V-0 Package materials No electrolytic capacitors Thermal shutdown Under voltage lock out Current fold back
The NCS12 series of DC/DC converters offers single & dual output voltages from input voltage ranges of 9-36V and 18-75V. The NCS12 is housed in an industry standard package with a standard pinout. The NCS12 is packaged in a metal case for improved EMI shielding and is also encapsulated for superior thermal performance. Applications include telecommunications, battery powered systems, process control and distributed power systems.
12V input types 48V input types Turn on threshold 12V input types Turn off threshold 12V input types Turn on threshold 48V input types Turn off threshold 48V input types NCS12X48 48V dual output types All other types
Power consumption at shutdown Reflected ripple current1 Calculated using MIL-HDBK-217 FN2, parts stress method with nominal input voltage at full load.
All specifications typical at TA=25�C, nominal input voltage and rated output current unless otherwise specified.
Rated power All output types Minimal load to meet datasheet specification Positive outputs Voltage set point accuracy Negative outputs Line regulation Cross Regulation Low line to high line
,D4812, D4815 Peak deviation & 37.5-12.5% swing) Single output types Settling time (within 1% Vout Nom.) Dual output types
Flash tested for 1 seconds Viso S4803, S4805 All other typesShort-circuit protection (for SELV input voltages) Control pin input voltage Lead temperature 1.0mm from case for 10 seconds (to JEDEC JESD22-B106 ISS C) Input voltage, NCS12 12V input types Input voltage, NCS12 48V input types 30 minutes 18V Max 40V 80V
& S4805 All other types Module on, pin unconnected or open collector floating Module offOperation Storage Case temperature above ambient
With derating - see derating graph NCS12D1205C, NCS12D4805C All other types Single & 5V outputs All other types
The NCS12 series does not require output capacitors to meet datasheet specification. To meet datasheet specification, total output capacitance should not exceed: Part No. NCS12D4812C NCS12D4815C Maximun Load Capacitance (per output) F Start-up times ms
`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 specifi ed time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. Murata Power Solutions NCS12 series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1.5kVDC 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 specifi c agency approvals, such as the NCS12 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.
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 NCS12 series has an ER 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 it is absolutely required, that the voltage be reduced by 20% from specifi ed 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.
This series is compatible with RoHS soldering systems with a peak wave solder temperature of 260�C for 10 seconds. The pin termination finish on this product series is a Gold flash (0.05-0.10 micron) over Nickel Preplate. The series is backward compatible with Sn/Pb soldering systems. For further information, please visit www.murata-ps.com/rohs
