GE进口备件IC693APU302

GE进口备件IC693APU302

IC693APU302电压变化速度不快，故可采用低速光耦，适用的光耦有：TLP521、PS2501、PC817等，这里采用PS2501，其小电流传输比为80%。为了能反映反馈电压的变化，光

耦应工作于线性区，所以当反馈电压为+15V时，设计光耦副边电流为1mA，其原边电流IF=1.25mA，原边压降UD=1.2V，I431A≈2mA。此处TL431A作比较器用， 即由R1、R2确定的REF端电压U8与TL431A内部的2.5V基准电压进行比较，因此阴极电位由外部电路决定。当反馈电压为+15V时，U8=2.5V，设定阴极电位U阴极为11V(U阴极可以设定的范围为+5V~+12V，若设定值太大，管子功耗将大大增加)。当反馈电压大于+15V时，U8增大，U阴极减小，IF增大，UC2844调节副边电压降低。同理可分析反馈电压小于+15V的情况。

IC693APU302 

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