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NCS1S2403SC Datasheet(PDF) 2 Page - Murata Power Solutions Inc. |
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NCS1S2403SC Datasheet(HTML) 2 Page - Murata Power Solutions Inc. |
2 / 8 page NCS1 Series Isolated 1W 4:1 Input Single Output DC/DC Converters KDC_NCS1.A02 Page 2 of 8 All enquiries: www.murata-ps.com/support www.murata-ps.com TEMPERATURE CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Operation -40 105 °C Storage -50 125 Case temperature 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) 260°C Input voltage, NCS1 12V input types 25V Input voltage, NCS1 24V input types 40V APPLICATION NOTES Start-up times Part No. Start-up times 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 sufficient drive current, the converter will be switched OFF. A suitable application circuit is shown below. D 1 (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 recom- mended to be 3mA, and hence the value of R 1 can be derived as follows: R 1 = Assuming V C =5V, V D =0.7V and V Q =1V: R 1 = = 1100Ω NCS1 V IN V C OV -V IN CTRL R 1 D 1 Q 1 R 2 V C - V D - V Q I C 5 - 0.7 - 1.0 3 x 10-3 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. |
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