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lm3150做的电源通电不正常

Other Parts Discussed in Thread: LM3150

用WEBENCH选择芯片LM3150及其推荐电路做的19-36V输入,5V5.5A输出电源加电后工作不正常,用线性电源加电,开始随着输入电压的增加而增加,当输入加到5V左右时,线性电源的输入电流突然从0突变到2A,输入电压再增加,线性电源保护。印制板是完全按照TI网站上的元件位置摆放的,不知道原因在哪儿