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输入电压等于输出电压
技术规格书中明确指出，SYNC端如果不用，接地。
怎么测TPS55340是否坏了
SW点对地导通的话，说明内部MOS管已经被击穿，IC已经损坏。
SYNC要接地，芯片更换后是否可以工作，如果还不行，请上传一下你的layout以及SW波形
