UAD149A0011自动化模块备件
确定设计是否能够容忍“开放”的铁芯几何形状
如棒或桶，它具有高磁场辐射，或者它是否需要一个封闭的磁芯，如环形线圈，以防止EMI问题。例如，人们不希望在磁存储介质旁边有一个开放的核心！这是一个艰难的决定，因为棒或桶非常便宜和小，而且没有有用的指南来计算磁场辐射何时会成为问题。4.开始选购符合铁芯形状、峰值电流（避免饱和）、平均电流（限制发热）和故障电流要求的电感器。如果电感器过热，导线绝缘将熔化并导致匝间短路。请记住，所有好的东西，如高效率、低调和高温操作，都会增加成本，有时甚至会急剧增加。
输出电压纹波
在做出初步选择后，考虑次要因素，如输出电压纹波、二次电源等。如果您对最终选择不确定，请咨询LTC应用部门的专家。他们有广泛的电感器类型的经验，可以告诉你在低剖面、表面安装等方面的最新发展。输出电容器输出电容器通常由其有效串联电阻（ESR）选择，因为这是决定输出纹波电压的因素。在500kHz时，任何极化电容器因此物理上较小的电容器具有高ESR。典型LT1370应用所需的ESR范围为0.025Ω 至0.2Ω. 典型的输出电容器是AVX型TPS，25V时22µF（每个两个），保证ESR小于0.2Ω. 这是一个“D”尺寸的表面贴装固体钽电容器。TPS电容器采用特殊结构，10个LT1370 sn1370 1370fs应用于ATIO UU W U输出二极管。建议的输出二极管（D1）为摩托罗拉MBRD835L。
Determine if the design will tolerate "open" core geometry
For example, a rod or a barrel, which has high magnetic field radiation, or whether it needs a closed magnetic core, such as a loop coil, to prevent EMI problems. For example, people do not want an open core next to magnetic storage media! This was a difficult decision, because the rod or barrel was very cheap and small, and there was no useful guide to calculate when magnetic field radiation would become a problem. 4. Start to purchase inductors that meet the requirements of core shape, peak current (avoid saturation), average current (limit heating) and fault current. If the inductor overheats, the wire insulation will melt and cause a turn to turn short circuit. Keep in mind that all good things, such as high efficiency, low-key and high temperature operation, will increase the cost, sometimes even sharply.
Output Voltage Ripple
After making a preliminary selection, consider secondary factors, such as output voltage ripple, secondary power supply, etc. If you are uncertain about the final choice, please consult the experts of LTC Application Department. They have extensive experience in inductor types and can tell you the latest developments in low profile, surface mounting, etc. Output capacitor The output capacitor is usually selected by its effective series resistance (ESR), because this is the factor that determines the output ripple voltage. At 500kHz, any polarized capacitor thus has a high ESR for physically smaller capacitors. The ESR required for typical LT1370 applications ranges from 0.025 Ω to 0.2 Ω. The typical output capacitor is an AVX type TPS, 22 µ F at 25V (two for each), ensuring that the ESR is less than 0.2 Ω. This is a surface mount solid tantalum capacitor of "D" size. TPS capacitor adopts special structure, and 10 LT1370 sn1370 1370fs are used for ATIO UU WU output diode. The recommended output diode (D1) is Motorola MBRD835L.
