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CRE1 Fiches technique(PDF) 2 Page - Murata Power Solutions Inc. |
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CRE1 Fiches technique(HTML) 2 Page - Murata Power Solutions Inc. |
2 / 14 page CRE1 Series Isolated 1W Single Output Isolated DC-DC Converters KDC_CRE1.D02 Page 2 of 14 www.murata-ps.com/support TEMPERATURE CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Specification All output types1 -40 85 °C Storage -50 130 Case temperature rise above ambient 5V output types 41 All other output types 32 CRE1S0505MC 43 CRE1S0505MEC 12.5 Cooling Free air convection 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 CRE1 series of DC-DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second for C versions and 3kVDC for 1 second for 3C versions. A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?” The CRE1 series, through hole variants (excluding surface mount variants) have been recognised 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 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 CRE1 series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enamelled 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. SAFETY APPROVAL The CRE1 series has been recognised by Underwriters Laboratory (UL) to UL60950 for functional insulation in a maximum still air ambient temperature of 100°C for the C versions and 130°C for the 3C versions as measured on the case of the unit (hotspot). The CRE1S0505MC is not currently UL recognised. The CRE1 series of converters are not internally fused so to meet the requirements of UL60950 an anti-surge input line fuse should always be used with ratings as defined below. CRE1S03xxS3C: 1A CRE1S05xxxxC: 0.7A CRE1S12xxSC: 0.2A CRE1S24xxSC: 0.16A All fuses should be UL recognised, 125V rated. File number E151252 applies. ABSOLUTE MAXIMUM RATINGS Lead temperature 1.5mm from case for 10 seconds 260°C Input voltage VIN, 3.3V input 5.5V Input voltage VIN, 5V input 7V Input voltage VIN, 12V input 15V Input voltage VIN, 24V input 28V 1. 24V input parts prior to date code D1635 have operating temperature range of 0 to 70°C. |
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