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下载“第Ⅴ章:光半导体” (PDF:1.8MB)
第1步:设计LED输入电流和输入电阻RIN。
光耦的输入电流(IF)是多少?
它将由(1)输入电源电压(5V),(2)限流电阻(RIN)和(3)LED正向电压(VF)决定。
根据规格示例,确定限流电阻和输入电流(IF)。
RIN=(VCC-VF)/IF=(5V-1.3V)/10mA=370Ω