第一次用这个电源芯片,原理图如上,输入电压12V,输入改变输出比较稳定。空载测得芯片VBF处电压0.81V,输出输出3.6V比计算值偏大,带两个内窥镜负载电压下降至3.2V,此时电流0.6A,请问下可能时什么原因引起的。
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