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LM3150加负载输出电压会下降,空载与加负载上端mos发热严重,过一会会烧



Vin=28V, Vout=12V,10A,空载时Vfb= 0.6V,加负载后, Vfb= 0.3V,加负载后,输出电压为3V , 4V左右变化,且上端MOS管发烫,过一会会烧,不加负载时也会发烫严重,烧上端mos管,请求大神帮忙解决一下,不胜感激!