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UCC28610芯片反馈FB引脚滤波器转折频率计算和设计,疑官方资料出错

Other Parts Discussed in Thread: UCC28610

UCC28610芯片手册SLUS888F(2012)第19页,第一段第5-6行:The corner frequency of the filter in Figure 24 should be at least a decade above the
maximum switching frequency of the converter, as given in Equation 11.

中文意思应该是:图24中的滤波器转折频率必须在转换器最大开关频率的10倍以上,该滤波器转折频率由等式11给出。

该芯片最大开关频率133KHz,那么滤波器转折频率应该是其10倍以上,即大于1330KHz。

但是在官方推荐的电路中Rfb = 20.5K ,Cfb = 100 pF,按11式计算Ffb = 77.67KHz,这远远小于1330KHz,

到底是官方这个算法有问题,还是本人的理解出错,求解!!!

附官方推荐电路和芯片手册如下

ucc28610 (1).pdf