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关于LM21215A-1 开关频率 不正确问题



使用LM21215A-1 IC分别做了2块板,输出2.5V/8A ,SYNC引脚空接,默认开关频率500KHZ,其中一块板SW波形周期2us、纹波都输出正常。但是另一块板SW开关频率始终为6us左右,无论空载还是带负载输出均没有变化,目前调整过输出电容、补偿参数,开关频率就是不对。不知道问题出在什么地方?