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lm5175输出功率低

Other Parts Discussed in Thread: LM5175

你好!

        用LM5175做了一个板,输入10-26v,输出14.8用做给锂电池充电。设计目标输出电流20A.在输入11v时,输出电流只有2.5a,且有啸叫声。

空载时测HDRV1  输出,如下图

什么原因?