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LM3150空载正常,带负载不正常

原理图和PCB见下图。参数是WEBENCH生成的。

现在空载时,24V供电,可以正常输出12V。

HG、LG、SW波形如下。FB大约有0.45V电压。

现在接负载50欧姆功率电阻,输出电压就变成4V左右了。HG、LG、SW波形如下。

请大家多多指教!!!谢谢!!