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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
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输入电流阈值是多少？
当输入电流IF达到或超过某个值时，带有放大器电路的IC耦合器将以逻辑方式工作，其输出会反相。用于输出反相所需的输入电流的阈值称为“输入电流阈值”，并用IFHL和IFLH等符号表示。该值因产品而异，其变化的最大值可由IFHL（最大值）指定。在设计实际使用的IF时，考虑到LED性能随时间、温度和设计裕度而降低，必须为IF设置一个大于IFHL（最大）的值。
另见东芝应用说明《Basic Characteristics and Application Circuit Design of IC Couplers》第2.3.1节。
（https://toshiba.semicon-storage.com/cn/semiconductor/knowledge/application-note.html）