Tuesday, 7 March 2017

buck - Resonant Frequency of LC Circuit in Switching Converter


Why do we set resonant frequency of LC circuit in a buck converter to be less than 10% of Fsw? For example, if Fsw is 300 kHz, why should resonant frequency be around 30KHZ. I am guessing it is due to voltage spikes at resonance, but can't it be just twice, if that's the case?




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