CME Series www.murata-ps.com Isolated 0.75W Single Output Isolated DC/DC Converters 5 5 12 CME0303S3C CME0305S3C CME0505S3C CME0512S3C 3.3 3.3 5 5 3.3 5 5 12 10 12 15 25 150 150 10 12 15 25 63 5 7 20 30 3KVDC isolation options 227 9 12 15 25 150 9 12 15 25 150 9 12 15 25 63 5 7 10 15 Single Isolated output 1kVDC or 3kVDC option Wide temperature performance at full 0.75W load -40 C to 85C° Industry Standard Pinout 3.3V and 5V Inputs Parameter Voltage range Pin Compatible with LME, MEE1, MEE3, NKE, NME, & NML series Reflected ripple current 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. mA % Min. Typ. pF kHrs 218 218 195 67 67 72 70 70 77 30 30 33 3400 3400 2200 300 300 218 200 66 68 65 70 73 73 70 75 30 35 28 30 1230 630 2400 630 INPUT CHARACTERISTICS 3.3V, 5V & 12V outputs PRODUCT OVERVIEW MTTF1 5 5 5 Isolation Capacitance CME0505DC CME0505SC CME0512SC % mV p-p Typ. Max. Typ. Max. Efficiency Output Current mA Input Current at Rated Load Output Voltage V Ripple & Noise Nominal Input Voltage V Order Code FEATURES Load Regulation SELECTION GUIDE Conditions Min. Typ. Max. Continuous operation, 3.3V input types Continuous operation, 5V input types 3.3V input types 5V input types 2.97 4.5 3.3 5.0 1.5 2 3.63 5.5 2 2.5 Units Typ. Max. Units 0.75 W 1.2 %/% Max. Units V mA OUTPUT CHARACTERISTICS Parameter Conditions Min. Rated Power TA=-40°C to 120°C, see derating graphs Voltage Set Point Accuracy See tolerance envelope Line regulation High VIN to low VIN 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 CME0505 All other types Min. Typ. Max. 120 135 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 260°C 5.5V 7V 1. Calculated using MIL-HDBK-217F with nominal input voltage at full load. All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support KDC_CME.A04 Page 1 of 7 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 Free air convection Typ. Max. Units 85 130 41 32 °C 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?” For a part holding no specific agency approvals, such as the CME 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 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 www.murata-ps.com/support KDC_CME.A04 Page 2 of 7 CME Series Isolated 0.75W Single Output Isolated DC/DC Converters TEMPERATURE DERATING GRAPHS 0303, 0305 types only. Output Power (W) Output Power (W) All other types. 85°C 0.75 Safe Operating Area 0 -40 100 50 0 Ambient Temperature (°C) Safe Operating Area 120°C 0 -40 150 85°C 0.75 100 50 0 Ambient Temperature (°C) 150 TOLERANCE ENVELOPES 5V output types. +8% Output Voltage +3% VNOM -2% Typica l Load Line 0% -5% -10% 10 75 50 25 Output Load Current (%) 100 +12% +8% +4% VNOM Output Voltage 3.3V output types. Typical L o ad Line +4% -0% -4% 10 75 50 25 Output Load Current (%) 100 12V output types. Output Voltage +8% +5% +2% VNOM 10 Typical L oad Lin e +3% 0% -3% 75 50 25 Output Load Current (%) 100 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.A04 Page 3 of 7 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 Start-up time μs 1000 1000 5600 540 1300 1080 5000 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.A04 Page 4 of 7 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 L, μH 47 47 68 10 47 10 68 Inductor SMD 82473C 82473C 82683C 82103C 82473C 82103C 82683C C Load DC Through Hole 11R473C 11R473C 11R683C 11R103C 11R473C 11R103C 11R683C Capacitor C, μF 4.7 4.7 1 4.7 4.7 4.7 0.68 www.murata-ps.com/support KDC_CME.A04 Page 5 of 7 CME Series Isolated 0.75W Single Output Isolated DC/DC Converters PACKAGE SPECIFICATIONS 3C Package DC Package SC Package 11.48 (0.45) 11.48 (0.45) 9.80 (0.386) 6.00 (0.236) CME0505DC 6.00 (0.236) XYYWW 11.50 (0.453) 7.46 (0.293) CME0505S3C 6.80 (0.267) 0.55 (0.022) 0.45 (0.018) XYYWW 10.0 (0.393) CME0505SC 0.55 (0.022) 0.45 (0.018) XYYWW 1 4.60 (0.181) 3.60 (0.142) 2 3 4 4.60 (0.181) 3.60 (0.142) 2.18±0.50 (0.086±0.0197) 1 0.55 (0.022) 0.45 (0.018) 0.50±0.05 (0.0196±0.00196) 2.54 (0.1) 0.30 (0.0118) 0.20 (0.0078) 1 2 3 4 4.60 (0.181) 3.60 (0.142) 4 0.55 (0.022) 0.45 (0.018) 1.89 (0.074) 2.77 (0.109) 1.09 (0.043) 0.30 (0.0118) 0.20 (0.0078) 7.62 (0.3) 1.25 (0.049) 7 0.30 (0.0118) 0.20 (0.0078) 7.62 (0.3) 1.25 (0.049) 5 5.08 (0.2) 7.62 (0.3) 7.62 (0.3) 1.94 (0.0763) All dimensions in millimetres ±0.25mm (“ ±0.01”). All pins on a 2.54 (0.1) pitch and within ± 0.25 (0.01) of true position. PIN CONNECTIONS - 8 PIN DC Weight: 1.09g (3C) 1.30g (SC) 1.38g (DC) PIN CONNECTIONS - 4 PIN 3C & SC Pin Function Pin 1 -VIN 1 -VIN 4 +VIN 2 +VIN 5 +VOUT 3 -VOUT 7 -VOUT 4 +VOUT Function www.murata-ps.com/support KDC_CME.A04 Page 6 of 7 CME Series Isolated 0.75W Single Output Isolated DC/DC Converters PACKAGE SPECIFICATIONS (continued) RECOMMENDED FOOTPRINT DETAILS 8 Pin DC Package 4 Pin 3C & SC Package 4 HOLES 0.1 (0.00394) 1.15 (0.0453) Ø 1.00 (0.0394) 2.54 (0.1) 2.54 (0.1) 4 HOLES 0.1 (0.00394) Ø 1.15 (0.0453) 1.00 (0.0394) 2.54 (0.1) 2.54 (0.1) TUBE OUTLINE DIMENSIONS SC Tube 3C Tube 9.30 (0.366) 14.80 (0.583) 12.43 (0.489) 7.70 (0.303) 0.50 (0.020) 5.07 (0.199) 18.00 (0.709) 14.50 (0.571) 9.30 (0.366) 0.60±0.15 (0.0236±0.006) DC Tube 12.0 (0.472) 5.10 (0.2) 0.65 (0.026) Unless otherwise stated all dimensions in inches (mm) ±0.5mm. Tube length (8 Pin DIP) : 20.47 (520mm ±2mm). Tube length (4 Pin SIP) : 20.67 (525mm ±2mm). 5.00 (0.2) 4.45 (0.175) Tube Quantity : 40 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 Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED 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. © 2015 Murata Power Solutions, Inc. www.murata-ps.com/support KDC_CME.A04 Page 7 of 7