GE供应IC693APU302RR

GE供应IC693APU302RR

IC693APU302RR为了不使光耦原边工作电流过小，取R7=1KΩ，此时流过光耦副边的电流为：

(5-3.68)/1+1=2.32mA

根据PS2501资料查得此时光耦原边电流约1.55mA，压降

约1V。

③电阻R4、R5的选取

为了使电源有较好的电压调节范围，设计时选TL431第1脚的工作电压为10V左右。

R4(1.55+1/R5)+1=15-10=5V，取R4=R5，得R4=R5=2.6KΩ，实取R4=R5=2KΩ。此时TL431第1脚的工作电压为11V。

④比例电阻R3和积分电容C2的选取

此电源设计时其开关周期为24.4us，为使电源有较好的稳定度，选取R3C2约为开关周期的4~5倍，即

24.4*4=97.6

选R3=10KΩ，C2=10nF

IC693APU302RR 

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