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NME0505SC Datasheet(PDF) 2 Page - Murata Manufacturing Co., Ltd. |
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NME0505SC Datasheet(HTML) 2 Page - Murata Manufacturing Co., Ltd. |
2 / 5 page KDC_NMEC.E04 Page 2 of 5 Technical enquiries - email: mk@murata-ps.com, tel: +44 (0)1908 615232 www.murata-ps.com NME 5V & 12V Series Isolated 1W Single Output DC/DC Converters GENERAL CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Switching frequency 5V input types 110 kHz 12V input types 145 ISOLATION CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Isolation test voltage Flash tested for 1 second 1000 VDC Resistance Viso= 1000VDC 10 GΩ TEMPERATURE CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Specification All output types -40 85 °C Storage -50 130 Case Temperature above ambient 5V output types 41 All other output types 32 Cooling Free air convection TEMPERATURE DERATING GRAPH 150 100 50 0 -40 0 0.5 1.0 1.5 Safe Operating Area 85°C Ambient Temperature (°C) 120°C TOLERANCE ENVELOPE +10% Output Load Current (%) +5% -7.5% -2.5% +2.5% Typical Load Line V NOM 100 75 50 25 10 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 NME 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 NME 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 NME 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. |
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