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常规BUCK转换器用于BUCK-BOOST拓扑的占空比问题

Other Parts Discussed in Thread: LMR14020, TPS54160, LMR16010

LMR14020这个芯片我想用作BUCK-BOOST拓扑,输出负电压,输入+18到30V输出负24V,所以需要比较大的占空比范围,最高可达到0.6左右,规格书上说在开关频率为200kHz时可以得到最大占空比,我想知道这个芯片在最高开关频率时能提供的最大占空比是多少?因为想降低电感量,所以想使用开关频率较高的芯片,有哪些更加合适的型号推荐给我?请给我点建议,非常感谢!