MEF1 Series www.murata-ps.com Isolated 1W Regulated Single Output DC/DC Converters Operation to zero load Output regulation <1% Power density 0.85W/cm3 Single isolated output UL 94V-0 package material Footprint from 1.17cm2 1kVDC or 3.5kVDC isolation options MEF1S0303SP3C MEF1S0305SP3C MEF1S0503SP3C MEF1S0505SP3C MEF1S1203SP3C MEF1S1205SP3C MEF1S2403SP3C MEF1S2405SP3C 3.3 3.3 5 5 12 12 24 24 3.3 5 3.3 5 3.3 5 3.3 5 Input Current (Typ.) Ripple & Noise (Max.) % % pF kHrs 63 68 65 69 65 69 64 68 66 71 68.5 73 69 73.5 69 73 40 30 40 50 40 60 35 45 495 867 665 1051 511 1044 580 834 63 68 65 69 65 69 64 68 66 71 68.5 73 69 73.5 69 73 40 30 40 50 40 60 35 45 495 867 665 1051 511 1044 580 834 mA mVp-p Efficiency (Min.) mA 303 11 35 460 200 9 35 430 303 8 30 290 200 10 40 275 303 11 35 120 200 10 35 115 303 13 40 60 200 13 40 55 3.5kVDC Isolation Part Numbers 303 11 35 460 200 9 35 430 303 8 30 290 200 10 40 275 303 11 35 120 200 10 35 115 303 13 40 60 200 13 40 55 Ripple & Noise (Typ.) MTTF1 Short circuit protection 3.3 5 3.3 5 3.3 5 3.3 5 Isolation Capacitance UL60950 recognised V 3.3 3.3 5 5 12 12 24 24 Efficiency (Typ.) FEATURES V MEF1S0303SPC MEF1S0305SPC MEF1S0503SPC MEF1S0505SPC MEF1S1203SPC MEF1S1205SPC MEF1S2403SPC MEF1S2405SPC Output Current Order Code Nominal Input Voltage Output Voltage SELECTION GUIDE 3.3V, 5V, 12V & 24V input INPUT CHARACTERISTICS 3.3V & 5V output Parameter Conditions Min. Typ. Max. Voltage range Continuous operation, 3.3V input types Continuous operation, 5V input types Continuous operation, 12V input types Continuous operation, 24V input types 3.135 4.75 11.4 22.8 3.3 5 12 24 5 3.465 5.25 12.6 25.2 20 mA p-p Typ. Max. Units 0.3 ± 2.5 ±2 1 0.25 1 SMD construction Fully encapsulated with toroidal magnetics DESCRIPTION Reflected ripple current The MEF1 series of DC/DC converters is used where a tightly regulated supply is required. They are ideal for situations where the input voltage is not tightly controlled. The single rail regulated output makes the ideal choice to power sensors, such as pressure transducers, hall effect sensors and mass airflow sensors. OUTPUT CHARACTERISTICS Parameter Voltage set point accuracy Rated power Line regulation Load regulation Conditions 3.3V Output 5V Output TA= -40°C to 85°C High VIN to low VIN 10% load to rated load Min. Units V % W %/% % ABSOLUTE MAXIMUM RATINGS Short-circuit protection Lead temperature 1.5mm from case for 10 seconds Internal power dissipation Input voltage VIN, MEF1S03 types Input voltage VIN, MEF1S05 types Input voltage VIN, MEF1S12 types Input voltage VIN, MEF1S24 types Continuous 260°C 450mW 4V 7V 18V 28V 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_MEF1.C02 Page 1 of 7 MEF1 Series Isolated 1W Regulated Single Output DC/DC Converters ISOLATION CHARACTERISTICS Parameter Conditions Min. SPC Versions Flash tested for 1 second SP3C Versions Flash tested for 1 minute Viso= 1kVDC 1000 3500 10 Parameter Conditions Min. Switching frequency 0303 5V input types 12V input types & 0305 24V input types Isolation test voltage Resistance Typ. Max. Units VDC GΩ GENERAL CHARACTERISTICS Typ. Max. 45 50 60 75 Units kHz TEMPERATURE CHARACTERISTICS Parameter Conditions Min. Specification Case temperature above ambient Storage Cooling All output types -40 -50 Typ. Max. Units 85 40 125 °C Free air convection TEMPERATURE DERATING GRAPH RoHS COMPLIANCE INFORMATION Output Power (W) 1.5 1.0 0.5 0 -40 This series is compatible with RoHS soldering systems with a peak wave solder temperature of 260ºC for 10 seconds. The pin termination finish on the SIP package type is Tin Plate, Hot Dipped over Matte Tin over Nickel Preplate. This series is backward compatible with Sn/Pb soldering systems. 85°C Safe Operating Area 100 50 0 Ambient Temperature (°C) 150 For further information, please visit www.murata-ps.com/rohs www.murata-ps.com/support KDC_MEF1.C02 Page 2 of 7 MEF1 Series Isolated 1W Regulated Single Output DC/DC Converters EFFICIENCY VS LOAD 5V Input 90 80 80 70 70 60 60 Efficiency (%) Efficiency (%) 3.3V Input 90 50 40 MEF1S0303SPC 30 50 40 MEF1S0503SPC 30 MEF1S0305SPC 20 20 10 10 MEF1S0505SPC 0 0 0 10 20 30 40 50 60 70 80 90 0 100 10 20 30 40 12V Input 60 70 80 90 100 24V Input 90 90 80 80 70 70 60 60 Efficiency (%) Efficiency (%) 50 Load (%) Load (%) 50 40 30 40 30 MEF1S1205SPC 20 50 MEF1S2405SPC 20 MEF1S1203SPC MEF1S2403SPC 10 10 0 0 0 10 20 30 40 50 60 Load (%) 70 80 90 100 0 10 20 30 40 50 60 70 80 90 100 Load (%) www.murata-ps.com/support KDC_MEF1.C02 Page 3 of 7 MEF1 Series Isolated 1W Regulated Single Output DC/DC Converters APPLICATION NOTES 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. Start-up time μs 310 550 225 460 185 390 160 430 310 550 225 460 185 390 160 430 MEF1S0303SPC MEF1S0305SPC MEF1S0503SPC MEF1S0505SPC MEF1S1203SPC MEF1S1205SPC MEF1S2403SPC MEF1S2405SPC MEF1S0303SP3C MEF1S0305SP3C MEF1S0503SP3C MEF1S0505SP3C MEF1S1203SP3C MEF1S1205SP3C MEF1S2403SP3C MEF1S2405SP3C MEF1S0305SP3C 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_MEF1.C02 Page 4 of 7 MEF1 Series Isolated 1W Regulated Single Output DC/DC Converters 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 MEF1 series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second for SPC versions and 3.5kVDC for 1 minute for SP3C versions. A question commonly asked is, “What is the continuous voltage that can be applied across the part in normal operation?” The MEF1 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 materials, construction and environment. The MEF1 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 MEF1 series has been recognized by Underwriters Laboratory (UL) to UL 60950 for functional insulation, file number E151252 applies. The MEF1 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. MEF1S03xxxC: 600mA MEF1S05xxxC: 400mA MEF1S12xxxC: 160mA MEF1S24xxxC: 100mA All fuses should be UL approved and rated to at least the maximum allowable DC input voltage. www.murata-ps.com/support KDC_MEF1.C02 Page 5 of 7 MEF1 Series Isolated 1W Regulated Single Output DC/DC Converters PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS PIN CONNECTIONS - SPC SPC SP3C 19.65 [0.774] MAX 19.65 [0.774] MAX 6.15 [0.242] MAX 10.15 [0.400] MAX 4.10±0.50 [0.161±0.020] 1 2 4 6 2.54 [0.100] 0.40 [0.016] MIN 0.40 [0.016] MIN 6.15 [0.242] MAX 10.15 [0.400] MAX 4.10±0.50 [0.161±0.020] 0.50 [0.020] 1 2 5 7 2.54 [0.100] 0.50 [0.020] Pin Function 1 2 4 6 +VIN -Vin -VOUT +VOUT PIN CONNECTIONS - SP3C Pin Function 1 2 5 7 +VIN -VIN -VOUT +VOUT 5.08 [0.200] 5.08 [0.200] 1.45 1.00 2.52 1.54 [ ] [ ] 0.057 0.039 12.70 [0.500] 0.099 0.061 1.45 1.00 [ ] 2.52 1.54 0.057 0.039 0.25 [0.010] 15.24 [0.600] [ ] 0.099 0.061 Weight: 1.6g All dimensions in mm (mm ±0.25mm) inches ±0.01. All pins on a 2.54 (0.1) pitch and within ±0.25 (0.1) of true position. www.murata-ps.com/support KDC_MEF1.C02 Page 6 of 7 MEF1 Series Isolated 1W Regulated Single Output DC/DC Converters PACKAGE SPECIFICATIONS (continued) RECOMMENDED FOOTPRINT DETAILS SPC SP3C 1.15 (0.045) Ø 1.00 (0.039) 1.15 (0.045) Ø 1.00 (0.039) 4 HOLES 4 HOLES 0.1 (0.004) 0.1 (0.004) 2.54 (0.1) 2.54 (0.1) 2.54 (0.1) 2.54 (0.1) All dimensions in mm ±0.25mm (inches ±0.01). TUBE OUTLINE DIMENSIONS 7 Pin SIP Tube 5.00 (0.2) 9.30 (0.366) 18.00 (0.709) 12.43 (0.489) 0.50 (0.020) Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED All dimensions in mm ±0.25mm (inches ±0.01). Tube length (7 Pin SIP) : 20.47 (520mm ±2mm). Tube Quantity : 25 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. © 2014 Murata Power Solutions, Inc. www.murata-ps.com/support KDC_MEF1.C02 Page 7 of 7