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NPH15S Datasheet(PDF) 5 Page - Murata Power Solutions Inc. |
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NPH15S Datasheet(HTML) 5 Page - Murata Power Solutions Inc. |
5 / 8 page NPH15S Series Isolated 15W Single Output DC-DC Converters KDC_NPH15S.F06 Page 5 of 8 www.murata-ps.com/support EMC FILTERING AND SPECTRA FILTERING The module includes a basic level of filtering, sufficient for many applications. Where lower noise levels are desired, filters can easily be added to achieve any required noise performance. A DC-DC converter generates noise in two principle forms: that which is radiated from its body and that conducted on its external connections. There are three separate modes of conducted noise: input differential, output differential and input-output. This last appears as common mode at the input and the output, and cannot therefore be removed by filtering at the input or output alone. The first level of filtering is to connect a capacitor between input and output returns, to reduce this form of noise. It typically contains high harmonics of the switching frequency, which tend to appear as spikes on surrounding circuits. The voltage rating of this capacitor must match the required isolation voltage. (Due to the great variety in isolation voltage and required noise performance, this capacitor has not been included within the converter.) Input ripple is a voltage developed across the internal Input decoupling capacitor. It is therefore measured with a defined supply source impedance. Although simple series inductance will provide filtering, on its own it can degrade the stability. A shunt capacitor is therefore recommended across the converter input terminals, so that it is fed from a low impedance. If no filtering is required, the inductance of long supply wiring could also cause a problem, requiring an input decoupling capacitor for stability. An electrolytic will perform well in these situations. The input-output filtering is performed by the common-mode choke on the primary. This could be placed on the output, but would then degrade the regulation and produce less benefit for a given size, cost, and power loss. Radiated noise is present in magnetic and electrostatic forms. The latter is suppressed by the metal case, which is connected to the output return, typically a zero-volt point. Thanks to the small size of these units, neither form of noise will be radiated “efficiently”, so will not normally cause a problem. Any question of this kind usually better repays attention to conducted signals. EMC FILTER AND VALUES TO OBTAIN SPECTRA AS SHOWN Component reference C1 C2 C3 C4 L1 L2 L3 NPH15S2403 10μF 100V 2.2μF 63V 47μF 63V 10μF 25V MPS 18R333C 33μH 2A MPS 18R472C 4.7μH 5.35A NPH15S2405 10μF 100V 2.2μF 63V 47μF 63V 10μF 25V MPS 18R333C 33μH 2A MPS 18R103C 10μH 3.45A NPH15S2412 10μF 100V 2.2μF 63V Not required 10μF 25V MPS 18R333C 33μH 2A MPS 18R333C 33μH 2.00A NPH15S2415 10μF 100V 2.2μF 63V 47μF 63V 10μF 25V MPS 18R333C 33μH 2A MPS 18R333C 33μH 2.00A NPH15S4803 10μF 100V Not required Not required 10μF 25V MPS 18R104C 100μH 1.2A MPS 18R472C 4.7μH 5.35A NPH15S4805 10μF 100V Not required Not required 10μF 25V MPS 18R104C 100μH 1.2A MPS 18R103C 10μH 3.45A NPH15S4812 10μF 100V Not required Not required 10μF 25V MPS 18R104C 100μH 1.2A MPS 18R333C 33μH 2.00A NPH15S4815 10μF 100V Not required Not required 10μF 25V MPS 18R104C 100μH 1.2A MPS 18R333C 33μH 2.00A C1, C2 & C4 : Electrolytic capacitors C3 : Polyester or ceramic capacitor EMC Spectra red limit line is EN 55022 curve B Quasi-peak average limit. |
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