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TPS40211设计问题

Other Parts Discussed in Thread: TPS40211

我做了一块板子,是参照EVM-352设计的,但是测试的时候发现输出升不起来,一升就断,看RC端的波形也是随着输出时好时坏,没升之前,锯齿波很好,一升起来,锯齿波里全是杂波,请问,是不是我布板的时候没布好,引入了干扰?还有11脚是否一定要接地