CME Series www.murata-ps.com Isolated 0.75W Single Output Isolated DC/DC Converters FEATURES 5 5 12 150 150 63 Short circuit protection options UL 60950 recognised Single Isolated output CME0303S3C CME0305S3C CME0505S3C CME0512S3C 3.3 3.3 5 5 3.3 5 5 12 227 150 150 63 1kVDC or 3kVDC option ‘Hi Pot Test’ Wide temperature performance at full 0.75W load -40°C to 85°C CME0505SPC CME0505DPC 5 5 5 5 150 150 Industry Standard Pinout 3.3V and 5V Inputs 3.3V, 5V & 12V outputs Pin Compatible with LME, MEE1, MEE3, NKE, NME, & NML series pF MIL. Tel. kHrs 67 67 72 70 70 77 30 30 33 3400 3400 2200 66 68 65 70 73 73 70 75 30 35 28 30 1230 630 2400 630 74 74 76.5 76.5 22 22 2887 47047 2887 47047 INPUT CHARACTERISTICS Parameter Voltage range Input short circuit current Input reflected ripple current PRODUCT OVERVIEW The CME series are a cost effective 0.75W DC/DC converter series, in industry standard packages with industry standard pinout, Popular input and output voltages are available as a lower power alternative to a 1W DC/DC converter. The galvanic isolation allows the device to be configured to provide an isolated negative rail in systems where only positive rails exist. The wide temperature range guarantees startup from –40°C and full 0.75 watt output at 85°C. For the short circuit protected parts (PC) protection is continuous and auto-resetting on removal of the short circuit. 218 10 12 15 25 218 10 12 15 25 195 5 7 20 30 3KVDC isolation options 300 9 12 15 25 300 9 12 15 25 218 9 12 15 25 200 5 7 10 15 Short Circuit Protection Options 195 7.5 9 11 25 195 7.5 9 11 25 MTTF1 5 5 5 % mV p-p % Typ. Max. Typ. Max. Min. Typ. Isolation Capacitance CME0505DC CME0505SC CME0512SC Efficiency mA Ripple & Noise mA Load Regulation Input Current at Rated Load V Nominal Input Voltage Output Voltage V Order Code Output Current SELECTION GUIDE Conditions Min. Typ. Max. Units Continuous operation, 3.3V input types Continuous operation, 5V input types Short circuit variants 3.3V input types 5V input types Short circuit types 2.97 4.5 3.3 5.0 95 1.5 2 3 3.63 5.5 V 2 2.5 15 mA p-p Typ. Max. Units 0.75 W 1.2 1.2 %/% Max. Units mA OUTPUT CHARACTERISTICS Parameter Conditions Min. Rated Power2 TA=-40°C to 85°C, see derating graphs Voltage Set Point Accuracy See tolerance envelope High VIN to low VIN ; Short circuit types Line regulation High VIN to low VIN ; All other output types 1.15 1.0 ISOLATION CHARACTERISTICS Parameter Isolation test voltage Resistance Conditions Min. C Versions Flash tested for 1 second 3C Versions Flash tested for 1 second Viso= 1000VDC 1000 3000 Typ. VDC 10 GΩ GENERAL CHARACTERISTICS Parameter Conditions Switching frequency CME0505XC Short circuit types All other types Min. Typ. Max. 120 91 135 Units kHz ABSOLUTE MAXIMUM RATINGS Lead temperature 1.5mm from case for 10 seconds Input voltage VIN, 3.3V input Input voltage VIN, 5V input For full details go to www.murata-ps.com/rohs 260°C 5.5V 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 specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified. www.murata-ps.com/support KDC_CME.B01 Page 1 of 11 CME Series Isolated 0.75W Single Output Isolated DC/DC Converters TEMPERATURE CHARACTERISTICS Parameter Conditions Min. Specification Storage All output types -40 -50 Case temperature rise above ambient Cooling 3.3V & 5V output types 12V output types Short circuit types (DIP) Short circuit types (SIP) Free air convection Typ. Max. Units 85 130 41 32 °C 23 24 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 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 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 CME series has been recognised by Underwriters Laboratory (UL) to UL 60950 for functional insulation in a maximum ambient temperature of 85ºC and/or case temperature limit of 100ºC for CMExxxxxC, 130ºC 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 defined 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 CME Series Isolated 0.75W Single Output Isolated DC/DC Converters RoHS COMPLIANCE INFORMATION This series is compatible with RoHS soldering systems with a peak wave solder temperature of 260°C for 10 seconds. The pin termination finish 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 TEMPERATURE DERATING GRAPHS All other types. Output Power (W) Output Power (W) 0303, 0305 & Short Circuit types. 85°C 0.75 Safe Operating Area 0 -40 100 50 0 Ambient Temperature (°C) 150 0.75 85°C Safe Operating Area 120°C 0 -40 100 50 0 Ambient Temperature (°C) 150 www.murata-ps.com/support KDC_CME.B01 Page 3 of 11 CME Series Isolated 0.75W Single Output Isolated DC/DC Converters EFFICIENCY VS LOAD CME0505XC CME0512SC CME0303S3C CME0305S3C CME0505S3C CME0512S3C www.murata-ps.com/support KDC_CME.B01 Page 4 of 11 CME Series Isolated 0.75W Single Output Isolated DC/DC Converters EFFICIENCY VS LOAD CONTINUED CME0505XPC 90 80 70 Efficiency (%) 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100 110 Load (%) TOLERANCE ENVELOPES 5V output types: +12% 3.3V output types: +8% 10 75 50 25 Output Load Current (%) 100 Output Voltage +8% -4% 10 75 50 25 Output Load Current (%) 100 +5% +3% +2% VNOM -3% 10 +4% +4% VNOM Short circuit types: +10% 12V output types: 75 50 25 Output Load Current (%) 100 Output Voltage Output Voltage -10% Output Voltage 0% VNOM -2% +2% VNOM -3% 10 25 50 100 75 Output Load Current (%) The voltage tolerance envelope shows typical load regulation characteristics for this product series. The tolerance envelope is the maximum output voltage variation due to changes in output loading. www.murata-ps.com/support KDC_CME.B01 Page 5 of 11 CME Series Isolated 0.75W Single Output Isolated DC/DC Converters APPLICATION NOTES Minimum load The minimum load to meet datasheet specification is 10% of the full rated load across the specified input voltage range. Lower than 10% minimum loading will result in an increase in output voltage, which may rise to typically double the specified output voltage if the output load falls to less than 5%. Capacitive loading and start up Typical start up times for this series, with a typical input voltage rise time of 2.2μs and output capacitance of 10μF, are shown in the table below. The product series will start into a capacitance of 47μF with an increased start time, however, the maximum recommended output capacitance is 10μF. Typical Start-Up Wave Form CME0505DC CME0505SC CME0512SC CME0303S3C CME0305S3C CME0505S3C CME0512S3C CME0505XPC Start-up time μs 1000 1000 5600 540 1300 1080 5000 350 Ripple & Noise Characterisation Method Ripple and noise measurements are performed with the following test configuration. C1 1μF X7R multilayer ceramic capacitor, voltage rating to be a minimum of 3 times the output voltage of the DC/DC converter 10μF tantalum capacitor, voltage rating to be a minimum of 1.5 times the output voltage of the DC/DC converter with an ESR of less C2 than 100mΩ at 100 kHz C3 100nF multilayer ceramic capacitor, general purpose R1 450Ω resistor, carbon film, ±1% tolerance R2 50Ω BNC termination T1 3T of the coax cable through a ferrite toroid RLOAD Resistive load to the maximum power rating of the DC/DC converter. Connections should be made via twisted wires Measured values are multiplied by 10 to obtain the specified values. Differential Mode Noise Test Schematic DC/DC Converter OSCILLOSCOPE C1 C2 C3 + SUPPLY Input - + R1 T1 R2 Y INPUT Output - R LOAD www.murata-ps.com/support KDC_CME.B01 Page 6 of 11 CME Series Isolated 0.75W Single Output Isolated DC/DC Converters APPLICATION NOTES (continued) Output Ripple Reduction By using the values of inductance and capacitance stated, the output ripple at the rated load is lowered to 5mV p-p max. Component selection Capacitor: It is required that the ESR (Equivalent Series Resistance) should be as low as possible, ceramic types are recommended. The voltage rating should be at least twice (except for 15V output), the rated output voltage of the DC/DC converter. Inductor: The rated current of the inductor should not be less than that of the output of the DC/DC converter. At the rated current, the DC resistance of the inductor should be such that the voltage drop across the inductor is <2% of the rated voltage of the DC/DC converter. The SRF (Self Resonant Frequency) should be >20MHz. L DC Power Source CME0505DC CME0505SC CME0512SC CME0303S3C CME0305S3C CME0505S3C CME0512S3C CME0505XPC L, μH 47 47 68 10 47 10 68 22 Inductor SMD 82473C 82473C 82683C 82103C 82473C 82103C 82683C 82223C C Load DC Through Hole 11R473C 11R473C 11R683C 11R103C 11R473C 11R103C 11R683C 11R223C Capacitor C, μF 4.7 4.7 1 4.7 4.7 4.7 0.68 1 www.murata-ps.com/support KDC_CME.B01 Page 7 of 11 CME Series Isolated 0.75W Single Output Isolated DC/DC Converters EMC FILTERING AND SPECTRA FILTERING The following filter circuit and filter table shows the input filters typically required to meet EN 55022 Curve B, Quasi-Peak EMC limit, as shown in the following plots. The following plots show positive and negative quasi peak and CISPR22 Average Limit B (pink line) and Quasi Peak Limit B (green line) adherence limits. L DC C DC Inductor Capacitor Part Number L, μH SMD Through Hole C, μF CME0505XC CME0512SC CME0303S3C CME0305S3C CME0505S3C CME0512S3C CME0505XPC 10 82103C 13R103C 1 CME0505XC CME0512SC CME0303S3C CME0305S3C www.murata-ps.com/support KDC_CME.B01 Page 8 of 11 CME Series Isolated 0.75W Single Output Isolated DC/DC Converters EMC FILTERING AND SPECTRA CME0505S3C CME0512S3C CME0505XPC 80 70 60 dBuV 50 40 30 20 10 0 1.00E+05 1.00E+06 1.00E+07 1.00E+08 Frequency (Hz) www.murata-ps.com/support KDC_CME.B01 Page 9 of 11 CME Series Isolated 0.75W Single Output Isolated DC/DC Converters PACKAGE SPECIFICATIONS DC Package SC Package 11.6±0.15 [0.457±0.006] 9.9±0.15 [0.390±0.006] 6.9±0.15 [0.272±0.006] 0.40 [0.016] MIN 11.53±0.2 [0.454±0.008] 10.00±0.25 [0.394±0.010] S 4.10±0.5 [0.161±0.020] 0.5±0.05 [0.020±0.002] 1 4.10±0.5 [0.161±0.020] 2 3 4 1.99±0.25 [0.078±0.010] 2.54 [0.100] 4 1 1.14±0.25 [0.045±0.010] 7.62 [0.300] 7 0.50±0.05 [0.020±0.002] 0.25±0.05 [0.010±0.002] (2.21 [0.087]) 5 6.10 +0.15 -0.20 (1.13 [0.044]) 0.25±0.05 [0.010±0.002] 5.08 [0.200] -0.008 ] [0.240 +0.006 7.62 [0.300] 3C Package PIN CONNECTIONS - 4 PIN SIP Pin Function 1 -VIN 2 +VIN 3 -VOUT 4 +VOUT PIN CONNECTIONS - 8 PIN DIP Pin C US Function 1 -VIN 4 +VIN 5 +VOUT 7 -VOUT All dimensions in mm (inches) Controlling dimension is mm. All pins on a 2.54 (0.100) pitch and within ±0. l (0.004) of true position from pin l at seating plane ‘S’ Weight: 1.09g (3C) 1.30g (SC) 1.38g (DC) 1.5g (DPC) www.murata-ps.com/support KDC_CME.B01 Page 10 of 11 CME Series Isolated 0.75W Single Output Isolated DC/DC Converters PACKAGE SPECIFICATIONS (continued) RECOMMENDED FOOTPRINT DETAILS 8 Pin DIP Package 4 Pin SIP Package 2.54 [0.100] x4 HOLES Ø 0.045 0.039 Ø 1.15 1.00 2.54 (0.1) 4 HOLES 0.1 (0.00394) [ ] 2.54 [0.100] Ø 1.15 (0.0453) 1.00 (0.0394) 2.54 (0.1) TUBE OUTLINE DIMENSIONS 8 Pin DIP Package 4 Pin SIP 3C SIP 9.3 [0.366] 12.0 [0.472] 7.7 [0.303] 12.43 [0.489] 14.5 [0.571] 9.3 [0.366] 14.8 [0.583] 18.0 [0.709] 5.07±1.10[0.200±0.04] 5.05 [0.199] Unless otherwise specified all dimensions in mm [inches] ±0.55mm [0.022]. Tube Length (DC&SC): 520mm [20.472] ±2.0 [0.079]. Tube Length (3C): 525mm [20.669] ±2.0 [0.079]. Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED 5.0 [0.197] 4.45 [0.175] Tube Quantity(DC&SC): 35 (3C) : 40 This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. © 2016 Murata Power Solutions, Inc. www.murata-ps.com/support KDC_CME.B01 Page 11 of 11