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请教一个问题关于LM5085的问题,短路输出电流达不到设定值



用TI的WENBENCH设计的电路图,输出电流设定为5A.但焊好元器件后测量短路电流只有0.8A的电流。C6串联一个0.22Ω电阻后,电流变为2.5A,但仍旧达不到5A的设计值。设计的电路是用来驱动24V电机的。请问是什么原因呢?原理图和PCB布线如下: