NCS1 Series www.murata-ps.com Isolated 1W 4:1 Input Single Output DC/DC Converters SELECTION GUIDE Input Efciency Efciency 1 Output Ripple and Noise MTTF Output Voltage 5V or 24V Input. 12V Input. Current Order Code Voltage Nom. Min. Typ. Min. Typ. Typ. Max. V V mA % % % % mVp/p mVp/p pF kHrs NCS1S1203SC 12 3.3 303 73 77 71 75 24 70 24 1020 NCS1S1205SC 12 5 200 76 79 74 77 25 50 30 915 NCS1S1212SC 12 12 83 75 78 75 79 40 120 35 1130 NCS1S2403SC 24 3.3 303 76 78.5 73 76 35 70 28 1217 NCS1S2405SC 24 5 200 79 82 77 80 27 50 42 1022 NCS1S2412SC 24 12 83 80 83 77 80 28 120 42 943 FEATURES INPUT CHARACTERISTICS UL 60950 recognised Parameter Conditions Min. Typ. Max. Units 4:1 Wide range voltage input 12V input types 4.5 12 18 Voltage range V 24V input types 9 24 36 Operating temperature range -40C to 5V input voltage 0.26 105C with derating NCS1S12XX 12V input voltage 0.1 Input current A 1kVDC Isolation Hi Pot Test 12V input voltage 0.1 NCS1S24XX 3.3V, 5V & 12V outputs 24V input voltage 0.05 NCS1S12XX 5 30 Input reected ripple No electrolytic capacitors mA p-p current NCS1S24XX 5 15 Continuous short circuit protection OUTPUT CHARACTERISTICS PRODUCT OVERVIEW Parameter Conditions Min. Typ. Max. Units Rated power All output types 1 W The NCS1 series of DC/DC converters offers a Minimal load to meet datasheet specication 10 % single output voltage from input voltage ranges Voltage set point accuracy All output types 1 2 % of 4.5-18V and 9-36V. The NCS1 is housed in an Line regulation Low line to high line 0.5 % industry standard package with a standard pinout. Load regulation All output types 0.5 % Peak deviation (12.5-37.5% & 37.5-12.5% swing) 5 %Vout Applications include telecommunications, battery Transient response Settling time powered systems, process control and distributed 2ms (within 5% V Nom.) out power systems. ISOLATION CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Isolation test voltage Flash tested for 1 second 1000 VDC Resistance Viso = 1kVDC 1 G GENERAL CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Switching frequency 100 400 kHz Module on, pin unconnected or open collector oating Control pin input Module off 0.8 V 1 Calculated using MIL-HDBK-217 FN2, parts stress method with nominal input voltage at full load. For full details go to All specications typical at TA=25C, nominal input voltage and rated output current unless otherwise specied. www.murata-ps.com/rohs www.murata-ps.com All enquiries: www.murata-ps.com/support KDC NCS1.D01 Page 1 of 8 Isolation CapacitanceNCS1 Series Isolated 1W 4:1 Input Single Output DC/DC Converters TEMPERATURE CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Operation -40 105 Storage -50 125 C Case temperature rise above ambient 100% Load, Nom VIN, Still Air 15 22 ABSOLUTE MAXIMUM RATINGS Short-circuit protection (for SELV input voltages) Continuous Control pin input voltage 18V Max Lead temperature 1.0mm from case for 10 seconds (to JEDEC JESD22-B106 ISS C) 260C Input voltage, NCS1 12V input types 25V Input voltage, NCS1 24V input types 40V APPLICATION NOTES Maximum Output Capacitance Maximum output capacitance should not exceed: Output Voltage Maximum Load Capacitance VF 3.3 470 5 470 12 220 Start-up times Typical start up times for this series, with a typical input voltage rise time of 2.2s and output capacitance of 10F, are shown in the table below. The product series will start into the maximum output capacitance with increased start times. Start-up times Part No. ms NCS1S1203SC 6 NCS1S1205SC 9 NCS1S1212SC 20 NCS1S2403SC 12 NCS1S2405SC 7 NCS1S2412SC 12 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 sufcient drive current, the converter will be switched OFF. A suitable application circuit is shown below. D (e.g. 1N4003) is required to provide high impedence when the signal is 1 NCS1 low. From the NCS1 specication, the drive current to operate this function is V IN recommended to be 3mA, and hence the value of R can be derived as follows: 1 R V - V - V 2 C D Q R = 1 I C V R D C 1 1 CTRL Q Assuming V =5V, V =0.7V and V =1V: C D Q OV 1 5 - 0.7 - 1.0 -V IN R = = 1100 1 -3 3 x 10 www.murata-ps.com All enquiries: www.murata-ps.com/support KDC NCS1.D01 Page 2 of 8