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ACE725E bảng dữ liệu(PDF) 9 Page - ACE Technology Co., LTD. |
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ACE725E bảng dữ liệu(HTML) 9 Page - ACE Technology Co., LTD. |
9 / 11 page ACE725E 24V , 1.2A High Efficiency Step-Down Converter VER 1.1 9 Output Capacitor Selection For most applications a nominal 22μF or larger capacitor is suitable. The ACE725E internal compensation is designed for a fixed corner frequency that is equal to 1 For example, for VOUT=5V, L=6.8μH, C OUT=22μF. The output capacitor keeps output ripple small and ensures control-loop stability. The output capacitor must also have low impedance at the switching frequency. Ceramic, polymer, and tantalum capacitors are suitable, with ceramic exhibiting the lowest ESR and high-frequency impedance. Output ripple with a ceramic output capacitor is approximately as follows: VRIPPLE = IL(PEAK)[1 / (2π x fOSC x COUT)] If the capacitor has significant ESR, the output ripple component due to capacitor ESR is as follows: VRIPPLE(ESR) = IL(PEAK) x ESR Input Capacitor Selection The input capacitor in a DC-to-DC converter reduces current peaks drawn from the battery or other input power source and reduces switching noise in the controller. The impedance of the input capacitor at the switching frequency should be less than that of the input source so high-frequency switching currents do not pass through the input source. The output capacitor keeps output ripple small and ensures control-loop stability. Components Selection VOUT (V) COUT (μF) L (μH) 8 22x2 10 to 15 5 22x2 6.8 to 10 3.3 22x2 4.7 to 10 2.5 22x2 3.3 to 10 FC= 2 ∗ π√COUT∗ L=20Khz |
Số phần tương tự - ACE725E |
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Mô tả tương tự - ACE725E |
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