CME Series www.murata-ps.com Isolated 0.75W Single Output Isolated DC/DC Converters SELECTION GUIDE % mV p-p % MIL. Tel. V V mA mA pF Typ. Max. Typ. Max. Min. Typ. kHrs CME0505DC 5 5 150 218 10 12 15 25 67 70 30 3400 FEATURES CME0505SC 5 5 150 218 10 12 15 25 67 70 30 3400 CME0512SC 5 12 63 195 5 7 20 30 72 77 33 2200 Short circuit protection options 3KVDC isolation options UL 60950 recognised CME0303S3C 3.3 3.3 227 300 9 12 15 25 66 73 30 1230 CME0305S3C 3.3 5 150 300 9 12 15 25 68 73 35 630 Single Isolated output CME0505S3C 5 5 150 218 9 12 15 25 65 70 28 2400 1kVDC or 3kVDC option Hi Pot Test CME0512S3C 5 12 63 200 5 7 10 15 70 75 30 630 Wide temperature performance at full Short Circuit Protection Options CME0505SPC 5 5 150 195 7.5 9 11 25 74 76.5 22 2887 47047 0.75W load -40C to 85C CME0505DPC 5 5 150 195 7.5 9 11 25 74 76.5 22 2887 47047 Industry Standard Pinout INPUT CHARACTERISTICS 3.3V and 5V Inputs Parameter Conditions Min. Typ. Max. Units 3.3V, 5V & 12V outputs Continuous operation, 3.3V input types 2.97 3.3 3.63 Voltage range V Continuous operation, 5V input types 4.5 5.0 5.5 Pin Compatible with LME, MEE1, MEE3, Input short circuit current Short circuit variants 95 mA NKE, NME, & NML series 3.3V input types 1.5 2 Input reected ripple mA p-p 5V input types 2 2.5 current Short circuit types 3 15 PRODUCT OVERVIEW OUTPUT CHARACTERISTICS The CME series are a cost effective 0.75W DC/DC Parameter Conditions Min. Typ. Max. Units converter series, in industry standard packages 2 with industry standard pinout, Popular input and Rated Power TA=-40C to 85C, see derating graphs 0.75 W output voltages are available as a lower power Voltage Set Point Accuracy See tolerance envelope alternative to a 1W DC/DC converter. The galvanic High VIN to low VIN Short circuit types 1.15 1.2 Line regulation %/% isolation allows the device to be congured to High VIN to low VIN All other output types 1.0 1.2 provide an isolated negative rail in systems where only positive rails exist. The wide temperature ISOLATION CHARACTERISTICS range guarantees startup from 40C and full 0.75 Parameter Conditions Min. Typ. Max. Units watt output at 85C. For the short circuit protected C Versions Flash tested for 1 second 1000 Isolation test voltage VDC parts (PC) protection is continuous and 3C Versions Flash tested for 1 second 3000 auto-resetting on removal of the short circuit. Resistance Viso= 1000VDC 10 G GENERAL CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units CME0505XC 120 Switching frequency Short circuit types 91 kHz All other types 135 ABSOLUTE MAXIMUM RATINGS Lead temperature 1.5mm from case for 10 seconds 260C Input voltage VIN, 3.3V input 5.5V Input voltage VIN, 5V input 7V 1. Calculated using MIL-HDBK-217 FN2 and Telcordia SR-332 calculation model with nominal input voltage at full load. 2. See derating curve. 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 CME.B01 Page 1 of 11 Order Code Nominal Input Voltage Output Voltage Output Current Input Current at Rated Load Load Regulation Ripple & Noise Efciency Isolation Capacitance 1 MTTFCME Series Isolated 0.75W Single Output Isolated DC/DC Converters TEMPERATURE CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Specication All output types -40 85 Storage -50 130 3.3V & 5V output types 41 C Case temperature rise above 12V output types 32 ambient Short circuit types (DIP) 23 24 Short circuit types (SIP) 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 specied time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. Murata Power Solutions CME 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 CME has 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 CME 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 CME series has been recognised by Underwriters Laboratory (UL) to UL 60950 for functional insulation in a maximum ambient temperature of 85C and/or case temperature limit of 100C for CMExxxxxC, 130C for CMExxxxS3C. Case temperature measured on the face opposite the pins. The CME series of converters are 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. CME03xxS3C: 0.9A CME05xxxxC: 0.5A All fuses should be UL recognized and rated to 125V. File number E151252 applies. www.murata-ps.com/support KDC CME.B01 Page 2 of 11