NCS1 Series www.murata-ps.com Isolated 1W 4:1 Input Single Output DC/DC Converters Order Code Efficiency Input Voltage Output Output 5V or 24V Input. Voltage Current Nom. V V mA Min. % Typ. % Min. % Typ. % 12 12 12 24 24 24 3.3 5 12 3.3 5 12 303 200 83 303 200 83 73 76 75 76 79 80 77 79 78 78.5 82 83 71 74 75 73 77 77 75 77 79 76 80 80 NCS1S1203SC NCS1S1205SC NCS1S1212SC NCS1S2403SC NCS1S2405SC NCS1S2412SC FEATURES UL 60950 recognition pending 4:1 Wide range voltage input Operating temperature range -40°C to 105°C with derating 1 kVDC Isolation Efficiency 12V Input. Ripple and Noise Typ. Max. mVp/p mVp/p 24 25 40 35 27 28 70 50 120 70 50 120 Isolation Capacitance SELECTION GUIDE pF MTTF1 Hrs 24 30 35 28 42 42 INPUT CHARACTERISTICS Parameter Voltage range Conditions Min. Typ. Max. 12V input types 4.5 12 18 24V input types 9 24 36 NCS1S12XX Input current 5V input voltage 0.26 12V input voltage 0.1 12V input voltage 0.1 24V input voltage 0.05 3.3V, 5V & 12V outputs No electrolytic capacitors NCS1S12XX 5 30 NCS1S24XX 5 15 Continuous short circuit protection V A NCS1S24XX Input ripple current Units mA p-p OUTPUT CHARACTERISTICS PRODUCT OVERVIEW Parameter The NCS1 series of DC/DC converters offers a single output voltage from input voltage ranges of 4.5-18V and 9-36V. The NCS1 is housed in an industry standard package with a standard pinout. Rated power All output types Minimal load to meet datasheet specification Voltage set point accuracy All output types Line regulation Low line to high line Load regulation All output types Peak deviation (12.5-37.5% & 37.5-12.5% swing) Transient response Settling time (within 5% Vout Nom.) Applications include telecommunications, battery powered systems, process control and distributed power systems. Conditions Min. Typ. Max. 1 Units W ±2 ±0.5 0.5 5 % % % % %Vout 10 ±1 2 ms ISOLATION CHARACTERISTICS Parameter Conditions Min. Isolation test voltage Resistance Flash tested for 1 minute Viso = 1kVDC 1000 1 Typ. Max. Units VDC GΩ GENERAL CHARACTERISTICS1 Parameter Conditions Min. Switching frequency Control pin input Typ. 100 Module on, pin unconnected or open collector floating Module off Max. Units 400 kHz 0.8 V 1 Calculated using MIL-HDBK-217 FN2, parts stress method 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 All enquiries: www.murata-ps.com/support KDC_NCS1.A02 Page 1 of 8 NCS1 Series Isolated 1W 4:1 Input Single Output DC/DC Converters TEMPERATURE CHARACTERISTICS Parameter Conditions Operation Storage Case temperature above ambient Min. Typ. Max. Units °C 15 105 125 22 -40 -50 100% Load, Nom VIN, Still Air ABSOLUTE MAXIMUM RATINGS Short-circuit protection (for SELV input voltages) Control pin input voltage Lead temperature 1.0mm from case for 10 seconds (to JEDEC JESD22-B106 ISS C) Input voltage, NCS1 12V input types Input voltage, NCS1 24V input types Continuous 18V Max 260°C 25V 40V APPLICATION NOTES Start-up times 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 times ms 6 9 20 12 7 12 Part No. NCS1S1203SC NCS1S1205SC NCS1S1212SC NCS1S2403SC NCS1S2405SC NCS1S2412SC Control Pin The NCS1 converters have a shutdown feature which enables the user to put the converter into a low power state. The control pin connects directly to the base of an internal transistor, and the switch off mechanism for the NCS1 works by forward biasing this NPN transistor. If the pin is left open (high impedance), the converter will be ON (there is no allowed low state for this pin), but once a control voltage is applied with sufficient drive current, the converter will be switched OFF. A suitable application circuit is shown below. D1 (e.g. 1N4003) is required to provide high impedence when the signal is low. From the NCS1 specification, the drive current to operate this function is recommended to be 3mA, and hence the value of R1 can be derived as follows: NCS1 VIN R2 VC OV -VIN R1 www.murata-ps.com D1 CTRL Q1 R1 = VC - VD - VQ IC Assuming VC=5V, VD=0.7V and VQ=1V: R1= 5 - 0.7 - 1.0 = 1100Ω 3 x 10-3 All enquiries: www.murata-ps.com/support KDC_NCS1.A02 Page 2 of 8 NCS1 Series Isolated 1W 4:1 Input 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 specifi ed time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. Murata Power Solutions NCS1 series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1.0kVDC 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 specific agency approvals, such as the NCS1 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 NCS1 series has a toroid core, 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. RoHS COMPLIANCE INFORMATION This series is compatible with RoHS soldering systems with a peak wave solder temperature of 260ºC for 10 seconds. The pin termination finish on this product series is Tin Plate, Hot Dipped over Matte Tin with Nickel Preplate. The series is backward compatible with Sn/Pb soldering systems. CHARACTERISATION TEST METHODS 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 All enquiries: www.murata-ps.com/support KDC_NCS1.A02 Page 3 of 8 NCS1 Series Isolated 1W 4:1 Input Single Output DC/DC Converters EFFICIENCY VS LOAD NCS1S1203SC NCS1S1205SC 90 80 80 70 70 60 60 40 4.5 Vin 5 Vin 12 Vin 30 18 Vin Efficiency (%) Efficiency (%) 50 50 4.5 Vin 40 5 Vin 12 Vin 18 Vin 30 20 20 10 10 0 0 0 10 20 30 40 50 60 70 80 90 0 100 10 20 30 40 Load (%) 50 60 70 80 90 100 Load (%) NCS1S1212SC NCS1S2403SC 90 90 80 80 70 70 60 Efficiency (%) 4.5 Vin 40 5 Vin 12 Vin Efficiency (%) 60 50 18 Vin 30 50 9 Vin 12 Vin 40 24 Vin 36 Vin 30 20 20 10 10 0 0 0 10 20 30 40 50 60 70 80 90 0 100 10 20 30 40 50 60 70 80 90 100 Load (%) Load (%) NCS1S2405SC NCS1S2412SC 90 90 80 80 70 70 60 9 Vin 12 Vin 40 24 Vin 36 Vin Efficiency (%) Efficiency (%) 60 50 50 9 Vin 12 Vin 40 24 Vin 30 30 20 20 10 10 36 Vin 0 0 0 10 20 30 40 50 Load (%) www.murata-ps.com 60 70 80 90 100 0 10 20 30 40 50 60 70 80 90 100 Load (%) All enquiries: www.murata-ps.com/support KDC_NCS1.A02 Page 4 of 8 NCS1 Series Isolated 1W 4:1 Input Single Output DC/DC Converters TEMPERATURE DERATING NCS1S1203SC NCS1S1205SC 100 100 90 95 80 90 70 85 Load (%) Load (%) 60 50 40 80 75 30 70 20 65 10 60 0 25 75 95 25 100 85 105 Ambient Temperature OC Ambient Temperature OC NCS1S1212SC NCS1S2403SC 100 100 95 90 90 85 80 80 75 70 70 65 60 Load (%) Load (%) 60 50 40 55 50 45 40 35 30 30 25 20 20 15 10 10 5 0 25 85 95 0 105 25 Ambient Temperature OC 75 95 100 Ambient Temperature OC NCS1S2405SC NCS1S2412SC 100 100 95 90 90 85 80 80 75 70 70 65 60 Load (%) Load (%) 60 55 50 45 50 40 40 35 30 30 25 20 20 15 10 10 5 0 0 25 75 Ambient Temperature OC www.murata-ps.com 105 25 85 95 105 Ambient Temperature OC All enquiries: www.murata-ps.com/support KDC_NCS1.A02 Page 5 of 8 NCS1 Series Isolated 1W 4:1 Input Single Output DC/DC Converters EMC FILTERING AND SPECTRA FILTERING The module includes a basic level of filtering, the following table shows the additional input capacitor and input inductor typically required to meet EN 55022 Curve A Quasi-Peak EMC limit, as shown in the following plots. Part Number Capacitor Inductor NCS1S1203SC NCS1S1205SC NCS1S1212SC NCS1S2403SC NCS1S2405SC NCS1S2412SC 330nF 330nF 2.2μF 330nF 330nF 330nF 500μH 500μH 2.2mH 500μH 500μH 500μH www.murata-ps.com Common Mode Choke 700μH All enquiries: www.murata-ps.com/support KDC_NCS1.A02 Page 6 of 8 NCS1 Series Isolated 1W 4:1 Input Single Output DC/DC Converters EMC FILTERING AND SPECTRA 80 70 60 50 40 30 20 10 0 1.00E+05 NCS1S1205SC dBuV dBuV NCS1S1203SC 1.00E+06 1.00E+07 1.00E+08 80 70 60 50 40 30 20 10 0 1.00E+05 1.00E+06 1.00E+07 1.00E+08 80 70 60 50 40 30 20 10 0 1.00E+05 Frequency (Hz) 1.00E+06 1.00E+07 1.00E+08 NCS1S2412SC dBuV dBuV 1.00E+08 Frequency (Hz) NCS1S2405SC 80 70 60 50 40 30 20 10 0 1.00E+05 1.00E+07 NCS1S2403SC dBuV dBuV NCS1S1212SC 80 70 60 50 40 30 20 10 0 1.00E+05 1.00E+06 Frequency (Hz) Frequency (Hz) 1.00E+06 1.00E+07 Frequency (Hz) www.murata-ps.com 1.00E+08 80 70 60 50 40 30 20 10 0 1.00E+05 1.00E+06 1.00E+07 1.00E+08 Frequency (Hz) All enquiries: www.murata-ps.com/support KDC_NCS1.A02 Page 7 of 8 NCS1 Series Isolated 1W 4:1 Input Single Output DC/DC Converters PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS PIN CONNECTIONS 21.87 [0.861] MAX 8.2 [0.323] MAX Pin Function Single 1 2 3 6 7 -VIN +VIN Control +VOUT -VOUT TUBE OUTLINE DIMENSIONS 0.50 (0.0197) NCS1S1205SC 11.30 [0.445] MAX XYYWW 12.30 (0.484) 0.40 [0.016] MIN 4.10±0.50 [0.161±0.020] 1 2 3 0.75 (0.0295) ±0.20 (0.0079) 6 7 0.50±0.05 [0.020±0.002] 2.54 [0.100] 5.00 (0.1969) 2.00 (0.0787) 2.00 (0.0787) 8.20 (0.3228) 15.24 [0.600] All dimensions in millimetres ±0.5 (inches ±0.01). Tube length: 520±2 (20.47 inches ±0.079). 3.52 2.87 0.25±0.05 [0 0.113 ] [0.139 RECOMMENDED FOOTPRINT DETAILS .010±0.002] 2.62 1.92 Quantity: 23 2.54 [0.100] 0.076 ] [0.103 x6 HOLES Ø 0.045 0.039 Ø 1.15 1.00 2.54 [0.100] All dimensions in millimetres (inches) ± 0.5 (0.020) except pin to pin tolerance ±0.25 (0.010). All pins on a 2.54 (0.100) pitch and within 0.25 (0.010) of true position. Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED www.murata-ps.com/support Weight: 3.3g [ ] 0.1 All dimensions in mm (inches) ±0.25 (± 0.010). 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. All enquiries: www.murata-ps.com/support KDC_NCS1.A02 Page 8 of 8