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发那科模块IC693ALG392LT
IC693ALG392LT功能需要:输出侧在电气上不共地,因此输入输出侧隔离,否则将造成原来不共地的地方共地而短路。典型的例子就是IGBT上下管的驱动电路,两只管子没有公共的地端,二者不能共地,否则将导致短路。
对于光耦的选型,根据不同用途需要考虑隔离电压、延迟时间、输入输出电流等主要指标。下面是几种常用的光耦:
通用型光耦:
常用的有PC817(sharp公司出品),隔离电压5000V,线性放大,响应时间4~18us,输入输出额定电流为50mA。
TLP181(东芝公司出品),隔离电压3500V,线性放大,响应时间5us左右,输入输出额定电流为50mA。
TLP521(东芝公司出品),隔离电压2500V,线性放大,响应时间5us左右,输入输出额定电流为50mA。
上述三种光耦电流传输特性曲线接近直线,并且小信号时性能较好,能以线性特性进行隔离控制,用于传输速度要求不高的场合,如X端子输入,Y端子输出,Fo故障信号的输出等处,也可用于开关电源。
IC693ALG392LT
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