原理图如上所示，第一次上电有12V输出，但后面就没有输出了。芯片已经换过了，还是一样的，FB现在只有0.6V，现在的输出电压为6V左右，SW和NMOS的G,S管脚震荡波形一样，找了几天也没找出具体原因，求大神们指点一下 啊。
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