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对于双向可控硅元件的ON／OFF，应设置多大的输入电流？
当流经LED的电流增加时，具有光电双向可控硅元件导通阈值的电流定义为触发LED电流（IFT）。该电流值因产品而异。该变化的最大值用IFT（最大值）表示。但这并不意味着在电路设计中，LED电流IF不得超过该最大值。在设计IF时，还应考虑LED随时间、温度和设计裕度出现的性能下降，IF值必须设置大于IFT（最大值）。
有关详情，另见东芝应用说明《Triac couplers-basic properties and application design》，第9.1节“How to design the input-side LED current IF”。对于IF，还规定了包括温度降额在内的最大额定值，并且必须检查是否超过了该额定值。
（https://toshiba.semicon-storage.com/cn/semiconductor/knowledge/application-note.html）