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TPS61196应用中遇到的一些问题

Other Parts Discussed in Thread: TPS61196EVM-600

按照典型应用搭的电路,每路电流设定为50mA,测试正常,总的输入电流大约0.29A,但点了一段时间后总的输入电流开始乱跳,同时MOS管发热,但单独测试的一路电流没有变化,LED灯的亮度也没有特别明显的变化,我怀疑增加的电流都是通过MOS管到地了。这种情况大约持续几十秒后又正常了,过段时间又会出现这种情况,这是什么原因?