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TPS40210输出3A电流时,芯片不工作

Other Parts Discussed in Thread: TPS40210

用TPS40210做升压电路,16V升压到24V,输出能力为5A,参考TI的设计软件进行的器件选型,但是输出超过2.5A后,芯片就不工作了,输出电压等于输入电压了,用示波器测量时发现,6毫欧的采样电阻处电压杂波很大,有几百mV的杂波,希望有人帮我解决一下