MMV1 Series www.murata-ps.com 3kVDC Isolated 1W Single Output DC/DC Converters with Short Circuit Protection SELECTION GUIDE Order Code V V mA mA % mVp-p % pF kHrs MMV1S0505SC 5 5 200 250 9 11 20 40 75 78 20 2680 MMV1S0524SC 5 24 41.7 245 4.5 6 15 20 79 81 36 3432 FEATURES INPUT CHARACTERISTICS Short circuit protection Parameter Conditions Min. Typ. Max. Units Voltage range Continuous operation 4.5 5 5.5 V Efciency from 78% typical 5V output types 100 Input short circuit current I mA Wide temperature performance at full SC 24V output types 45 1 Watt load, 40C to 85C Reected ripple current 5 15 mA p-p UL 94V-0 package material ABSOLUTE MAXIMUM RATINGS 3kVDC isolation (1 minute) Hi Pot Test Lead temperature 1.5mm from case for 10 seconds 260C Input voltage VIN 7V Internal SMD construction Fully encapsulated with toroidal OUTPUT CHARACTERISTICS magnetics Parameter Conditions Min. Typ. Max. Units Rated Power 1W No external components required TA=-40C to 85C Voltage Set Point Accuracy See tolerance envelope No electrolytic or tantalum capacitors Line regulation High VIN to low VIN 1.1 1.2 %/% Patent pending ISOLATION CHARACTERISTICS UL60950 recognised Parameter Conditions Min. Typ. Max. Units Operation to zero load Isolation test voltage Flash tested for 1 minute 3000 VDC Resistance Viso= 1000VDC 10 G PRODUCT OVERVIEW GENERAL CHARACTERISTICS The MMV1S series of DC/DC converters are a high Parameter Conditions Min. Typ. Max. Units efciency version of the popular NMV series but Switching frequency 88 kHz with guaranteed short circuit protection across the operating temperature range. Short circuits of less TEMPERATURE CHARACTERISTICS than 1 cause the converter to enter a foldback Parameter Conditions Min. Typ. Max. Units limiting mode such that the the input current is Operating -40 85 approximately 100mA for 0505 variant and 45mA Storage -50 125 C for 0524 variant. Protection is continuous and 25 Case Temperature rise above ambient auto-resetting on removal of the short circuit. Cooling Free air convection 1. Calculated using MIL-HDBK-217 FN2 calculation model with nominal input voltage at full load. For full details go to All specications typical at TA=25C, nominal input voltage and rated output current unless otherwise specied. www.murata-ps.com/rohs www.murata-ps.com/support KDC MMV1.B02 Page 1 of 5 Nominal Input Voltage Output Voltage Output Current Input Current at Rated Load Load Regulation (Typ) Load Regulation (Max) Ripple & Noise (Typ) Ripple & Noise (Max) Efciency (Min.) Efciency (Typ.) Isolation Capacitance 1 MTTFTypical Load Line Typical Load Line MMV1 Series 3kVDC Isolated 1W Single Output DC/DC Converters with Short Circuit Protection 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 specied time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. Murata Power Solutions MMV1 series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 3kVDC for 1 minute. A question commonly asked is, What is the continuous voltage that can be applied across the part in normal operation The MMV1 has been recognized 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 materi- als, construction and environment. The MMV1 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 specied 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 MMV1 has been recognized by Underwriters Laboratory (UL) to UL 60950 for functional insulation in a maximum still air ambient temperature of 85C and/or case temperature limit of 155C (case temperature measured on the face opposite the pins). The MMV1 converter is not internally fused so to meet the requirements of UL 60950 an anti-surge input line fuse should always be used with ratings as dened below. MMV1S0505SC: 0.375A MMV1S0524SC: 0.4A The fuses should be UL recognized and rated to at least the maximum allowable DC input voltage. File number E151252 applies. TOLERANCE ENVELOPE The voltage tolerance envelopes show typical load regulation characteristics for this product series. The tolerance envelope is the maximum output voltage variation due to the changes in output loading. MMV1S0505SC MMV1S0524SC +10% +5% +4% +3% 1% 0% V V NOM NOM -2% -6% 75 100 100 10 25 50 10 25 50 75 Output Load Current (%) Output Load Current (%) www.murata-ps.com/support KDC MMV1.B02 Page 2 of 5 Output Voltage Output Voltage