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[求助] Buck Converter的操作频率选择

Other Parts Discussed in Thread: TPS40077, TINA-TI

各位前辈好
小弟目前在学习电源转换,最近要实务一转换器BUCK转换器,虽然对于理论有基本了解,但是在实务设计上却卡住了。

预估采用TPS40077做设计,
规格如下Vin:10V〜14V   Vout:5V   Vout_Ripple = Vout * 1%   Pout:100W
EFF:92%
但一开始就遇到问题,我该如何确定我的操作频率为多少,来设计磁性元件呢?

由输出电压涟波反推?还是先决定所要用铁芯?或是先选择MOSFET的操作极限?该由哪些条件下去选用频率?