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NCS12S4805C Datasheet(PDF) 3 Page - Murata Power Solutions Inc. |
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NCS12S4805C Datasheet(HTML) 3 Page - Murata Power Solutions Inc. |
3 / 14 page NCS12 Series Isolated 12W 4:1 Input Single & Dual Output DC/DC Converters KDC_NCS12C.A02 Page 3 of 14 All enquiries: www.murata-ps.com/support www.murata-ps.com APPLICATION NOTES Output Capacitance and start-up times The NCS12 series does not require output capacitors to meet datasheet specification. To meet datasheet specification, total output capacitance should not exceed: Part No. Maximun Load Capacitance (per output) Start-up times μF ms NCS12S1203C 470 16 NCS12S1205C 470 22 NCS12S1212C 220 7 NCS12S1215C 220 8.5 NCS12S4803C 470 14 NCS12S4805C 470 22 NCS12S4812C 220 8 NCS12S4815C 220 8.5 NCS12D1205C 220 5 NCS12D1212C 100 8 NCS12D1215C 100 9 NCS12D4805C 220 5 NCS12D4812C 100 7.5 NCS12D4815C 100 7 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 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. 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 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 polyure- thane) 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 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. RoHS COMPLIANCE INFORMATION This series is compatible with RoHS soldering systems with a peak wave solder temperature of 260ºC 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 |
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