在使用TPS767D301时，二通道输出正常，fixout 3.3v，但是一通道从上电开始从1.6v一直增加到输入电压，换了两个出现该问题，
并且，已将输出管脚和后续电路隔离。
feedback根据手册悬空处理，即为fixout输出模式，但是这个fixout究竟是多少伏特也没有说明。
感谢各位解答！
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