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F4804A-G Datasheet(PDF) 10 Page - Power-One |
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F4804A-G Datasheet(HTML) 10 Page - Power-One |
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10 / 41 page  MCD10059 Rev. 1.1, 21-Jan-10 Page 10 of 41 www.power-one.com F & FC Series DC-DC Converter Input Filters F2410 & F4810, 0-45V/0-80V, 10 Amps, SMT Mount The F4810 and F2410 filters contain input and output capacitors, plus differential and common mode inductors. Shown in Fig. 1, the schematic diagrams of both filters are similar, the only difference are changes in C1, C2 capacitor values. The separate differential inductor, L2, allows a 50 Ω differential attenuation of 60 dB across the stated frequency range, a value substantially higher in comparison with other available off-the-shelf filters (typically 25-30 dB). The F4810 can be used in 24 V or 48 V systems without any limitations; however, in 24 V systems the F2410 differential attenuation is better. At low frequencies around 100-200 kHz the difference is 20dB, but at high frequencies the plots are close to identical. Absolute maximum voltage and maximum operating voltage in Electrical Specifications Table are for the filter itself; check maximum rating for corresponding dc-dc converters. The filter will not be damaged by reversed input voltage, or by applying voltage to the output pins. C2 L1-1 V OUT+ V OUT- L1-2 L2 C1 4.2 H V IN- V IN+ R1 49.9 4 F 3 F Fig. 1: Schematic diagram for F4810, F2410. The Capacitor values shown are for F4810; for F2410 C1=10 μF; C2=13 μF. Fig. 2: F4810 - Differential mode attenuation, 0.2-100 MHz. Source and load resistances are 50 Ω. Vertical scale: 10 dB/div, with zero level marked by arrow. No load, 25 ºC. Fig. 3: F2410 - Differential mode attenuation, 0.2-100 MHz. Source and load resistance 50 Ω. Vertical scale: 10 dB/div, with zero level marked by arrow. No load, 25 ºC. Differential attenuation plots for the F4810 and F2410 filters in the extended frequency range of 20 kHz-100 MHz are shown in Fig. 2 and Fig. 3, respectively, and can be seen to be flat (around 55-60 dB) from 0.35 MHz to 40 MHz. Fig. 4 shows Common mode attenuation with 50 Ω source and load. The attenuation is the same for both filters, and depends on the value of external Y-capacitors, connected between input pins and frame or a reference ground. Fig. 4: F4810/F2410 - Common Mode attenuation, 0.2-100 MHz. Source and load resistances are 50 Ω. Two 0.1uF Y- caps to common line. Vertical scale: 10 dB/div, with zero dB level marked by arrow. |
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