www.murata-ps.com NCS Series Isolated W : Input Single & Dual Output DC-DC Converters FEATURES UL 9 recognised RoHS compliant : Wide range voltage input Operating temperature range C to 8 C Typical load regulation from.%.kvdc Isolation Typical efficiency to 8% V & 8V Nominal input Power density.9w/cm UL 9V- Package materials No electrolytic capacitors Low noise Under voltage lock out Current fold back PRODUCT OVERVIEW The NCS series of DC-DC converters offers single & dual output voltages from input voltage ranges of 9-V and 8-V. The NCS is housed in an industry standard package with a standard pinout. The NCS is packaged in a metal case for improved EMI shielding and is also encapsulated for superior thermal performance. Applications include telecommunications, battery powered systems, process control and distributed power systems. For full details go to www.murata-ps.com/rohs SELECTION GUIDE Input Output Input Current Ripple & Efficiency Voltage Output Current Noise Order Code Voltage % % % Nom. Load (Typ.) Min. Typ. Load Load MTTF V V A ma ma mv p-p % % Hrs NCSDC ± ±. 8 8 8, NCSDC ± ±. 8 8 8, NCSDC ± ±. 8 8 8,9 NCSSC.. 8, NCSSC. 9 8,9 NCSSC. 8 8 8, NCSSC. 8 8 8,8 NCSD8C 8 ± ±. 9 8,9 NCSD8C 8 ± ±. 8 8 9, NCSD8C 8 ± ±. 8 8, NCSS8C 8.. 8, NCSS8C 8. 8 8,8 NCSS8C 8. 8 8 8, NCSS8C 8. 8 8,9 INPUT CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units V input types 9 Voltage range V 8V input types 8 8 Turn on threshold V input types 8. Turn off threshold V input types. Under voltage lock out V Turn on threshold 8V input types. Turn off threshold 8V input types.8 Single output types V input types Dual output types Reflected ripple current Single output types 9 8V input types ma p-p Dual output types OUTPUT CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units V, V & V output types Rated power W.V output types Positive outputs ± Voltage set point accuracy Negative outputs ± % Positive outputs.. Line regulation Low line to high line % Negative outputs.9. V outputs.. Load Regulation Cross Regulation Start-up Time % total load to % total load % voltage change on negative output when positive load varies from.% to.% with negative load fixed at %.V & V output types V output types V output types V positive outputs.. V & V positive outputs.. All negative outputs.. V V & V. Single output types. Dual output types Single output types. Dual output types Single output types. Dual output types Calculated using MIL-HDBK-F FN, parts stress method with nominal input voltage at full load. All specifications typical at TA= C, nominal input voltage and rated output current unless otherwise specified. % % ms KDC_NCSC.D Page of
NCS Series Isolated W : Input Single & Dual Output DC-DC Converters ISOLATION CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Isolation test voltage Flash tested for seconds VDC Resistance Viso = kvdc GΩ Capacitance pf ABSOLUTE MAXIMUM RATINGS Short-circuit protection (for SELV input voltages) Continuous Internal power dissipation.w Lead temperature.mm from case for seconds (to JEDEC JESD-B ISS C) C Minimum output load for specification (see application notes) % of rated load Input voltage, NCS V input types V Input voltage, NCS 8V input types 8V GENERAL CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Switching frequency 8 khz TEMPERATURE CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Operation - 8 Storage - Case temperature rise above ambient % Load, Nom VIN, Still Air 8VIN Dual outputs All other output types V V V.V V V 8 V Thermal shutdown Case Temperature C KDC_NCSC.D Page of
TECHNICAL NOTES NCS Series Isolated W : Input Single & Dual Output DC-DC Converters 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 NCS series of DC-DC converters are all % production tested at their stated isolation voltage. This is.kvdc for second. A question commonly asked is, What is the continuous voltage that can be applied across the part in normal operation? The NCS has been recognised by Underwriters Laboratory for functional isolation. Both input and output should normally be maintained within SELV limits i.e. less than.v peak, or VDC. 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 NCS series has an ER ferrite core, with no additional insulation between primary and secondary windings of enamelled 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 % from specified test voltage. This consideration equally applies to agency recognised 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 NCS series has been recognised by Underwriters Laboratory (UL) to UL 9 for functional insulation in a maximum ambient temperature of 8ºC and/or case temperature limit of ºC (case temperature measured on the face opposite the pins). File number E applies. Note: This series gained UL 9 recognition for products manufactured on or after datecode G, any NCS parts manufactured before this date code should not be considered UL 9 recognised. Any NCS that is UL recognised will be printed with the UL logo. RoHS COMPLIANCE INFORMATION This series is compatible with RoHS soldering systems with a peak wave solder temperature of ºC for seconds. The pin termination finish on this product series is a Gold flash (.-. micron) over Nickel Preplate. The series is backward compatible with Sn/Pb soldering systems. For further information, please visit www.murata-ps.com/rohs KDC_NCSC.D Page of
NCS Series Isolated W : Input Single & Dual Output DC-DC Converters APPLICATION NOTES Output Capacitors The NCS series does not require output capacitors to meet datasheet specification. To meet datasheet specification, total output capacitance should not exceed: Output Voltage (V) Output Capacitance (μf). Minimum Load The minimum load to meet full datasheet specification is % of the full rated load across the specified input voltage range. Between % and % output loading, the positive output voltage will remain within data sheet specification however, output ripple and noise will increase as well as a decrease in accuracy on negative outputs. CHARACTERISATION TEST METHODS Ripple & Noise Characterisation Method Ripple and noise measurements are performed with the following test configuration. C μf XR m ultilayer ceramic capacitor, voltage rating to be a minimum of times the output voltage of the DC-DC converter μf tantalum capacitor, voltage rating to be a minimum of. times the output voltage of the DC-DC converter with an ESR of less C than mω at khz C nf multilayer ceramic capacitor, general purpose R Ω resistor, carbon film, ±% tolerance R Ω BNC termination T T 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 to obtain the specified values. Differential Mode Noise Test Schematic DC/DC Converter OSCILLOSCOPE C C C R T R + + Y INPUT SUPPLY Input Output - - R LOAD KDC_NCSC.D Page of
NCS Series Isolated W : Input Single & Dual Output DC-DC Converters EFFICIENCY VS LOAD NCSSC NCSSC NCSS8C 9 NCSS8C 9 8 9 8 V V % % % % % % % 8% 9% % 8 8 8 8 % % % % % % % 8% 9% % % V V V 8V 8V V % % % % % % % 8% 9% % % % % % % % % 8% 9% % % NCSSC 9 8 % % % % % % % 8% 9% % NCSSC 9 8 9 8 V 8V % % % % % % % 8% 9% % % NCSS8C V V V V % % % % % % % 8% 9% % NCSS8C 9 8 V 8V % % % % % % % 8% 9% % % KDC_NCSC.D Page of
NCS Series Isolated W : Input Single & Dual Output DC-DC Converters EFFICIENCY VS LOAD NCSDC 8 8 V V 8 % % % % % % % 8% 9% % % NCSDC 9 NCSDC 9 8 8 V V % % % % % % % 8% 9% % % NCSD8C 8 8 8 8 V V 8V V % % % % % % % 8% 9% % % NCSD8C 9 8 8 V 8V % % % % % % % 8% 9% % % % % % % % % % 8% 9% % % NCSD8C 9 8 8 V 8V % % % % % % % 8% 9% % % KDC_NCSC.D Page of
NCS Series Isolated W : Input Single & Dual Output DC-DC Converters TEMPERATURE DERATING NCSSC NCSSC lfm lfm lfm - - - - 8 lfm lfm lfm - - - - 8 NCSSC NCSSC lfm lfm lfm - - - - 8 lfm lfm lfm - - - - 8 NCSS8C NCSS8C lfm lfm lfm - - - - 8 lfm lfm lfm - - - - 8 NCSS8C NCSS8C lfm lfm lfm lfm lfm - - - - 8 lfm - - - - 8 KDC_NCSC.D Page of
NCS Series Isolated W : Input Single & Dual Output DC-DC Converters TEMPERATURE DERATING NCSDC NCSDC lfm lfm lfm lfm lfm lfm NCSDC - - - - 8 NCSD8C - - - - 8 lfm lfm lfm lfm lfm lfm NCSD8C - - - - 8 NCSD8C - - - - 8 lfm lfm lfm - - - - 8 lfm lfm lfm - - - - 8 KDC_NCSC.D Page 8 of
NCS Series Isolated W : Input Single & Dual 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 typically required to meet EN Curve A Quasi-Peak EMC limit, as shown in the below plots. NCSDC.μF NCSSC.μF NCSDC none NCSSC.μF NCSDC none NCSSC μf NCSD8C μf NCSSC μf NCSD8C μf NCSS8C.μF NCSD8C μf NCSS8C μf NCSS8C μf NCSS8C μf NCSDC 9 8 NCSDC 9 8 NCSDC 9 8 NCSD8C 9 8 NCSD8C 9 8 NCSD8C 9 8 KDC_NCSC.D Page 9 of
NCS Series Isolated W : Input Single & Dual Output DC-DC Converters EMC FILTERING AND SPECTRA (continued) NCSSC 9 8 NCSSC NCSS8C NCSS8C 9 8 9 8 9 8 NCSSC 9 8 NCSSC 9 8 NCSS8C 9 8 NCSS8C 9 8 KDC_NCSC.D Page of
NCS Series Isolated W : Input Single & Dual Output DC-DC Converters PACKAGE SPECIFICATIONS MECHANICAL DIMENSIONS. (.8) NCSXXXXXC XYYWW. (.9). (.) PIN CONNECTIONS Pin Function Single Dual -VIN -VIN -VIN -VIN 9 No pin OV N/C -VOUT +VOUT +VOUT -VOUT OV +VIN +VIN +VIN +VIN. (.9). (.9) TUBE OUTLINE DIMENSIONS.±. (.±.). (.). (.). (.) 8. (.). (.9). (.).8 (.) 9. (.9). (.8) Tube length (.) All dimensions in mm (inches) ±. (.). Quantity:. (.) RECOMMENDED FOOTPRINT DETAILS 8 HOLES.mm Ø. (.). (.8). (.) All dimensions in mm (inches) ±. (.) except pin to pin tolerance ±. (.). All pins on a. (.) pitch and within. (.) of true position. Weight: g The copper case is connected to the output (-VOUT) pin. Care is needed in the design of this circuit board on which the converter is mounted. Top side tracks must not contact the edge of the case on the underside of the unit. Please note that from onwards, you may receive either a blue or a black case.. (.) All dimensions in mm (inches) ±. (±.). 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. 8 Murata Power Solutions, Inc. KDC_NCSC.D Page of
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