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TPS54340 输出带负载能力不够



我用的DS上的电路,输入24V,输出3.3V,上面的参数均没变,空载时电压3.45V电压输出。加10R负载,输出为3.41; 加5R负载,输出仅为1.6V,这个时候用万用表测得SW端电压值16V,请问这是什么原因导致的呢?