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这在很大程度上取决于产品类型以及相关产品的电流传输比。考虑到实际应用,具有通用性能的产品可在几毫安范围内的输入侧使用电流,而低输入类型(高度灵敏型)产品可在1mA左右的范围内使用。但这可能会根据所需的响应时间和负载电阻范围而发生很大的变化。
有关详情,参阅东芝应用说明《Basic Characteristics and Application Circuit Design of Transistor Couplers》第2-4节“Design Example for Interface Circuit Using Transistor Coupler”。
(https://toshiba.semicon-storage.com/cn/semiconductor/knowledge/application-note.html)