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二极管
晶体管
通用逻辑IC
模拟器件
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如何使用光耦“输出电流”
下载“第Ⅴ章：光半导体” (PDF:1.8MB)
第2步：根据IF和CTR计算光电晶体管的输出电流。
光耦的输出电流（IC）值是多少？
根据电流传输比（IC／IF）计算输入电流（IF）＝10mA时输出电流（IC）的变化。 从IC-IF曲线可以看出IC＝10mA（@IF＝5mA，VCE＝5V，Ta＝25℃）。所以这个样本的CTR是200%, 这与当BL最小时的值相同（200%到600%）。还可以看到IC＝20 mA（@IF＝10 mA、VCE＝5V、Ta＝25℃）。
接下来，我们用这里得到的IC值来推导RL。在这项计算中，设计RL的值，使得VCE即使在IC值最小时也成为饱和电压。
