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TPS54160芯片问题

Other Parts Discussed in Thread: TPS54160

1,请问该类型芯片的电压反馈部分(Vsense引脚)的匹配电阻在设置上有什么要求吗?比如TPS54160芯片的R2电阻数据手册中建议是10K或更大,如果该电阻设置过小会造成什么影响?

2,TPS54160芯片在使用中我们遇到了一个问题:根据电压反馈电阻设置的输出电压是13.4V,但电路有时在空载时输出确是15V,有时又是正常的,带载情况下均是正常的。