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ucc28019芯片Vac(on)与Vac(off)疑问

Other Parts Discussed in Thread: UCC28019

图片在附件里面,问题一:UCC28019芯片里面计算Cout电容值的时候有计算那个什么电容率,Tholduuup=1/fline(min),这个fline(min)是什么哇,我看手册

应用反推回去是47HZ,所有的应用电路都是取这个值吗??

                            问题二:手册里面那个VAC(ON)和VAC(OFF)各表示什么电压??看不懂那个参数!!!!