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TPS54331电压输出问题

Other Parts Discussed in Thread: TPS54331

我用TPS54331搭的电路,开始还能正常工作(24v输入  8v输出),然后我想输出纹波小一点,就在输出端多并联了一个电容,结果输出为21v左右,反馈没作用了,我又把并联的电阻取下来,结果还是21v,不知道是不是芯片烧坏了,测量反馈端的电压有2.2v,不知道怎么回事,如果芯片问题,有什么办法测试芯片的好坏?如果不是芯片问题,那又是什么问题呢?求帮帮忙!