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对于晶体管输出光耦,当LED电流IF传递至输入侧时,集电极电流IC在输出侧流动。Ic与IF的传输比称为电流传输比(CTR),并由以下公式定义:
CTR=(IC/IF)×100(%)
与晶体管的hFE一样,电流传输比是晶体管输出光耦的一个重要参数。
另见东芝应用说明《Basic Characteristics and Application Circuit Design of Transistor Couplers》第1-1节“Current Transfer Ratio”。
(https://toshiba.semicon-storage.com/cn/semiconductor/knowledge/application-note.html)
然而,对于IC输出光耦、光继电器和双向可控硅输出光耦,输入电流IF的电流阈值反转为输出状态以便在输出侧工作,将其定义为输入电流阈值;而对于光继电器和双向可控硅输出光耦,该值被定义为LED触发电流。当使用以上任何一种光耦和光继电器时,必须针对驱动LED电流设置一个等于或大于数据表中写入的“输入电流阈值(最大值)”或“LED触发电流(最大值)”的数值。
另见东芝应用说明《Basic Characteristics and Application Circuit Design of IC Couplers》第2.3.3节“Threshold input current
IFLH、IFHL”。
(https://toshiba.semicon-storage.com/cn/semiconductor/knowledge/application-note.html)