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UCC28C44: 关于UCC28C44的comp引脚输入问题

Part Number: UCC28C44

在这个应用场景中,当IC2感应到的电流降低时,通过什么途径使得com引脚的电压值变化的,因为我理解的光耦是电流传输,而IC2直接与com和gnd相连接,不清楚怎么实现电压变化