NMA 24V & 48V SeriesA www.murata-pss.com Isolated 1W Dual Output DC/DC ConvertersW SELECTION GUIDE Nominal Recommended Output Output Isolation 1 Input Efciency MTTF Package Alternatives Voltage Current Capacitance Order Code Voltage Style (click for data sheet) V V mA % pF kHrs Not recommended for new designs: NMA2405SC 24 5 100 70 39 194 MEA1D2405SC NMA2409SC 24 9 55 77 85 129 MEA1D2409SC SIP NMA2412SC 24 12 42 80 65 134 MEA1D2412SC FEATURES NMA2415SC 24 15 33 80 95 101 MEA1D2415SC Obsolete: RoHS compliant NMA2405DC 24 5 100 70 39 194 MEA1D2405DC Efciency up to 80% NMA2409DC 24 9 55 77 85 129 MEA1D2409DC 3 NMA2412DC 24 12 42 80 65 134 MEA1D2412DC Power density up to 0.85W/cm NMA2415DC 24 15 33 80 95 101 MEA1D2415DC DIP Dual output from a single input rail NMA4805DC 48 5 100 70 26 206 MEA1D4805DC NMA4809DC 48 9 55 80 38 174 MEA1D4809DC UL 94V-0 package material NMA4812DC 48 12 42 80 52 139 MEA1D4812DC No heatsink required NMA4815DC 48 15 33 80 56 104 MEA1D4815DC 2 Footprint from 1.17cm NMA4805SC 48 5 100 70 26 206 MEA1D4805SC NMA4809SC 48 9 55 80 38 174 MEA1D4809SC Industry standard pinout SIP NMA4812SC 48 12 42 80 52 139 MEA1D4812SC Power sharing on output NMA4815SC 48 15 33 80 56 104 MEA1D4815SC When operated with additional external load capacitance the rise time of the input voltage will determine the maximum external 1kVDC isolation capacitance value for guaranteed start up. The slower the rise time of the input voltage the greater the maximum value of the additional external capacitance for reliable start up. 24V & 48V input 5V, 9V, 12V and 15V output INPUT CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Internal SMD construction Continuous operation, 24V input types 21.6 24 26.4 Voltage range V Fully encapsulated with toroidal Continuous operation, 48V input types 43.2 48 52.8 magnetics OUTPUT CHARACTERISTICS No external components required Parameter Conditions Min. Typ. Max. Units 2 Rated Power 1W TA=0C to 70C DESCRIPTION Voltage Set Point Accuracy See tolerance envelope The NMA series of DC/DC converters are the Line regulation High VIN to low VIN 1.2 %/% standard buliding blocks for on-board distrib- 10% load to rated load, 5V output types 15 uted power systems. They are ideally suited for Load Regulation % 10% load to rated load, all other output types 10 providing dual rail supplies on primarily digital Ripple and Noise BW=DC to 20MHz, all input types 150 mV p-p boards with the added benet of galvanic isolation to reduce switching noise. All of the rated power ABSOLUTE MAXIMUM RATINGS may be drawn from a single pin provided the total Lead temperature 1.5mm from case for 10 seconds 300C load does not exceed 1 watt. Internal power dissipation 450mW Input voltage VIN, NMA24 types 28V Input voltage VIN, NMA48 types 54V 1. Calculated using MIL-HDBK-217F with nominal input voltage at full load. 2. See derating graph. All specications typical at TA=25C, nominal input voltage and rated output current unless otherwise specied. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support KDC NMAC2.G02 Page 1 of 4 NOT RECOMMENDED FOR NEW DESIGNSSNMA 24V & 48V Series Isolated 1W Dual Output DC/DC Converters ISOLATION CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Isolation test voltage Flash tested for 1 second 1000 VDC Resistance Viso= 500VDC 10 G GENERAL CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Switching frequency All input types 100 kHz TEMPERATURE CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Specication All output types 0 70 C Storage -55 150 Cooling Free air convection RoHS COMPLIANCE INFORMATION This series is compatible with RoHS soldering systems with a peak wave solder temperature of 300C for 10 seconds. The pin termination nish on the SIP package type is Tin Plate, Hot Dipped over Matte Tin with Nickel Preplate. The DIP types are Matte Tin over Nickel Preplate. Both types in this series are backward compatible with Sn/Pb soldering systems. For further information, please visit www.murata-ps.com/rohs 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 NMA 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 specic agency approvals, such as the NMA 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 NMA 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. APPLICATION NOTES Minimum load The minimum load to meet datasheet specication is 10% of the full rated load across the specied input voltage range. Lower than 10% minimum loading will result in an increase in output voltage, which may rise to typically double the specied output voltage if the output load falls to less than 5%. www.murata-ps.com/support KDC NMAC2.G02 Page 2 of 4