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LM2623A带5V/500mA负载,输出电压下降厉害



原理图是datasheet里提供的典型应用。

其中L1为10uH功率电感,C3为6pF,D1为SS14二极管。

当没有负载时,输出电压为5V;当有负载时(500mA电流),输出电压约4.1V,下降得非常厉害。

请问是啥原因呢?