UAD149A0011自動化模塊備件
確定設計是否能夠容忍“開放”的鐵芯幾何形狀
如棒或桶，它具有高磁場輻射，或者它是否需要一個封閉的磁芯，如環(huán)形線圈，以防止EMI問題。例如，人們不希望在磁存儲介質(zhì)旁邊有一個開放的核心！這是一個艱難的決定，因為棒或桶非常便宜和小，而且沒有有用的指南來計算磁場輻射何時會成為問題。4.開始選購符合鐵芯形狀、峰值電流（避免飽和）、平均電流（限制發(fā)熱）和故障電流要求的電感器。如果電感器過熱，導線絕緣將熔化并導致匝間短路。請記住，所有好的東西，如高效率、低調(diào)和高溫操作，都會增加成本，有時甚至會急劇增加。
輸出電壓紋波
在做出初步選擇后，考慮次要因素，如輸出電壓紋波、二次電源等。如果您對最終選擇不確定，請咨詢LTC應用部門的專家。他們有廣泛的電感器類型的經(jīng)驗，可以告訴你在低剖面、表面安裝等方面的最新發(fā)展。輸出電容器輸出電容器通常由其有效串聯(lián)電阻（ESR）選擇，因為這是決定輸出紋波電壓的因素。在500kHz時，任何極化電容器因此物理上較小的電容器具有高ESR。典型LT1370應用所需的ESR范圍為0.025? 至0.2?. 典型的輸出電容器是AVX型TPS，25V時22μF（每個兩個），保證ESR小于0.2?. 這是一個“D”尺寸的表面貼裝固體鉭電容器。TPS電容器采用特殊結(jié)構(gòu)，10個LT1370 sn1370 1370fs應用于ATIO UU W U輸出二極管。建議的輸出二極管（D1）為摩托羅拉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 ? to 0.2 ?. 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 ?. 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.
