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ML0308AMRG データシート(PDF) 6 Page - Minilogic Device Corporation Limited |
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ML0308AMRG データシート(HTML) 6 Page - Minilogic Device Corporation Limited |
6 / 9 page ML0308 Preliminary ______________________________________________________________________________________________________ 6/9 Rev. B, July 2005 Best results will be obtained when IPEAK is kept below 300mA. Capacitor Selection Low ESR (Equivalent Series Resistance) capacitors should be used at the output to minimize the output ripple voltage. Multilayer ceramic capacitors are the best choice, as they have a very low ESR and are available in very small packages. Their small size makes them a good companion to the ML0308 SOT23 package. Solid tantalum capacitors can be used, but they will occupy more board area than a ceramic and will have a higher ESR. Always use a capacitor with a sufficient voltage rating. Ceramic capacitors also make a good choice for the input decoupling capacitor, which should be placed as close as possible to the ML0308. A 4.7uF input capacitor is sufficient for most applications. Diode Selection For most ML0308 applications, the Motorola MBR0520 surface mount Schottky diode (0.5A, 20V) is an ideal choice. Schottky diodes, with their low forward voltage drop and fast switching speed, are the best match for the ML0308. Many different manufacturers make equivalent parts, but make sure that the component is rated to handle at least 0.35A. Lowering Output Voltage Ripple Using low ESR capacitors will help minimize the output ripple voltage, but proper selection of the inductor and the output capacitor also plays a big role. The ML0308 provides energy to the load in bursts by ramping up the inductor current, then delivering that current to the load. If too large of an inductor value or too small of a capacitor value is used, the output ripple voltage will increase because the capacitor will be slightly overcharged each burst cycle. To reduce the output ripple, increase the output capacitor value or add a 4.7pF feed-forward capacitor in the feedback network of the ML0308 (see the circuits in the Typical Applications section). Adding this small, inexpensive 4.7pF capacitor will greatly reduce the output voltage ripple. |
同様の部品番号 - ML0308AMRG |
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同様の説明 - ML0308AMRG |
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