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TPS55330带大负载启动不了

Other Parts Discussed in Thread: TPS55330

用TPS55330设计的升压电路,输入6.4-11.5V 输出12V 2A   电路图如下:

PCB布局参考TPS55330的评估板,现在有以下问题:

带16欧姆的负载,电源可以正常启动,带10欧姆的负载,电源启动不了,电感发出“滋滋滋”的声音,有一个奇怪的现象,我用手摸以下反馈电阻R45系统就可以启动了,请问这个是什么问题,该如何改进?