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SM055C475MHN480 データシート(PDF) 5 Page - AVX Corporation |
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SM055C475MHN480 データシート(HTML) 5 Page - AVX Corporation |
5 / 112 page 4 FOREWORD High speed switch mode power supplies place high demands on the capacitors used in the input or output filters of Resonant DC-DC or Pulse Modulated DC-DC converters. AVX Corporation has developed several multilayer ceramic (MLC) capacitor styles for these switcher applications. These capacitors have been extensively tested and characterized and found to have almost ideal performances to meet the stringent requirements of these applications. Input Filter Capacitor The Input Filter capacitor is required to perform two functions: To supply an unrestricted burst of current to the power supply switch circuitry and to not only do it without generating any noise, but to help suppress noise generated in the switch circuitry. It is, in effect, a very large decoupling capacitor. It must have very low ESL, capabilities for very high dv/dt, as well as di/dt and it must have a very low ESR to eliminate power loss. The distance from the primary DC source, as well as the type of capacitor used in this source (usually electrolytics), presents a very high inductance to the input of the Switcher. The MLC input capacitor, with its excellent ESL and ESR characteristics, is located physically close to the switch circuitry. Repetitive peak currents, inherent with the Switcher design, require a high ripple capability, as well as high surge capability for transients, both induced and conducted from other sources. MLCs have both these capabilities. Output Filter Capacitor The output from the switching circuit of a Switcher consists of current on and off. From an elevated DC reference, this current is an AC ripple additive on the DC. In order to smooth this ripple effect, a filter circuit (usually inductive input) is built to allow a storage of energy to take place during the rising ripple portion and to allow a discharge of energy during the falling ripple portion. The ESR and ESL of the capacitor contribute to the net ripple effect. The output filter capacitor is chosen for ESR, and with previous types of capacitors, multiples were used in an attempt to lower the net ESR. The MLC offers ESRs well below the minimum allowable to lower noise levels, thus eliminating the need for multiple units. Other MLC Capacitors for SMPS Applications AVX also manufactures coupling, decoupling, resonant and snubber capacitors for SMPS applications. Contact AVX for Application Specific S.M.P.S. capacitor requirements. Olean, NY, USA 716-372-6611 Coleraine, Northern Ireland ++44(0) 28703 44188 St. Apollinaire, France ++33(0) 38071 7400 SMPS Capacitors SMPS Capacitor Applications |
同様の部品番号 - SM055C475MHN480 |
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同様の説明 - SM055C475MHN480 |
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