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长时间使用双向可控硅（TRIAC）耦合器应采取哪些预防措施？
当长时间连续给LED供电时，其光输出会逐渐降低。由于上述原因，LED触发电流IFT会大于其初始值。通过使用有关LED随时间推移衰减的数据，必须设置IF的初始值，以便在经过设计时间后其也会超过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”。
（https://toshiba.semicon-storage.com/cn/semiconductor/knowledge/application-note.html）