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关于TPS54160升压电路板的问题

Other Parts Discussed in Thread: TPS54160

输出电容用的220uF并10uF,电感大小为22uH,是按照开关频率为250KHZ设计的,并且在Rt引脚也是加了相应的近500K的电阻设置开关频率,可是实际运行中的开关频率只能到60KHZ,导致纹波在600mv,有时还伴随有频率不稳定,电感滋滋响的问题,求解答!