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[求助] Buck Converter的操作频率选择

Ming Han Huang
Prodigy 81 points
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？