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光耦的主要特性（触发LED电流）
下载“第Ⅴ章：光学半导体” (PDF:1.8MB)
触发LED电流
触发LED电流被指定用于执行输出开／关二进制操作的产品，比如逻辑输出的IC耦合器，光继电器，和可控硅输出耦合器.
触发LED电流”是指“触发状态发生变化的LED电流”。
IFT, IFH, IFLH, IFLH等用作符号。
规格书中显示的触发LED电流表示了产品保证的电流值。为了稳定运行，设计人员在设计时必须保证至少有触发LED电流（最大值）流动。
输入LED电流IF从0mA逐渐增大，如果输出在1mA时切换到导通状态，则IFT＝1mA。
在下面的规格书中，将输出切换到导通状态所需的IF
最大值为3mA。
触发LED电流是电路设计和使用寿命设计的重要项目。
