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FC100V5A Scheda tecnica(PDF) 6 Page - Power-One |
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FC100V5A Scheda tecnica(HTML) 6 Page - Power-One |
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6 / 41 page  MCD10059 Rev. 1.1, 21-Jan-10 Page 6 of 41 www.power-one.com F & FC Series DC-DC Converter Input Filters F4804A, 0-80V, 4 Amps, SMT Mount For additional information regarding layout and EMC, refer to the Layout Considerations and EMI Considerations Application notes. The following bulleted items are considerations regarding the external components for the typical application shown in Fig. 5. Input electrolytic capacitor C1. We recommend 1-2 µF/W for 48V applications. This capacitor is needed to ensure stability of converters in presence of their negative input impedance characteristic. Note that electrolytic capacitors at -40 ºC have 3-5 times less capacitance than at room temperature, and therefore it is good practice to check the power system at worst case conditions from this point of view, i.e. lowest ambient temperature, minimum input voltage, and maximum load. If electrolytic capacitors are restricted for use in the system, please contact the factory. Input capacitors C2, C3 are optional; they decrease input ripple current and improve EMI. One or two of the following ceramic chip capacitors per converter are recommended: – TDK C4532X7R2A105, 1.0 µF, 100 V Common-mode capacitor (Y-cap) values and their EMI attenuation effects depend on system grounding and layout. If connection of capacitors between input and output is prohibited because of system restrictions, connect Y-capacitors only from each input pin to system ground (CY1 and CY2 on Fig. 5). The value of these capacitors in this case is “the bigger the better” (preferably 0.1 µF or larger). Voltage rating of Y-capacitors depends on the system isolation and safety requirements. Output capacitors C8, C9 are optional to reduce output ripple. Addition of one-two 47 µF ceramic capacitors, for example, for low voltage applications 3.3 V and below, significantly decreases output ripple from 25-40 mV peak-to-peak to 5-10 mV. Recommended capacitor for these low voltage applications is C3225X5R0J476 from TDK. F4804A filter should be protected with a 5 Amps fuse (R451005 from Littelfuse). Smaller value fuses can be used as required for protection to a lower power limit. |
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