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TPS40170 电压输出正常,带不了负载。各位大神帮忙分析一下啊!!!急着用啊!!急!急!急!急!急!急!急!急!急!急!急!急

电路如上所示,本来带3A的负载。现在带不了。电压输出正常,灯显示也正常。ILIM电阻R21调了也没什么用。输入电压超过28V,还容易烧芯片,有那位大神知道这是为什么吗?以前论坛上也有这么一个贴,但没看到有什么解决的办法啊。。。。。。。