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TPS54386: OUTPUT2输出异常(仅0.8V),OUTPUT1输出正常

Part Number: TPS54386
Other Parts Discussed in Thread: TPS62933

我设计了一个TPS54386输出双路12V3A的电路,原理图及Layout参考如下,奇怪的是OUTPUT1输出正常(无负载情况),但OUTPUT2却输出异常

实测空载情况下FB2引脚是0.8V微微浮动(与之相对的FB1是0.8V稳定),SW2引脚是0.8V±0.1V左右的方波(与之相对的SW1是0-12V的不太标准的方波)