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LM3478的补偿

Other Parts Discussed in Thread: LM3478

AN-1990 Compensation for Current mode Control Sepic Converter这篇文章中,附录B提到的参数,Tm=Tsw/2(2mc+Vin/L1+Vin/L2);

这里的Tsw/2,究竟是一个常数,还是一个变量?是不是仅仅因为在文章中的例子里,因为占空比为50%,所以是Tsw/2?

根据式子里的看,似乎应该是一个变量,实际是Tsw乘以占空比?或者着个参数不重要,按照Tsw*50%计算即可?

另外ti的WEBENCH里设计电路,lm3478的频率范围是固定的,不可调吗?有功能更强些的设计软件吗?