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TPS51396AEVM: TPS51396AEVM负压问题求助

Part Number: TPS51396AEVM

HI,TI的工程师,您好。下图是我搭建的负压电路。遇到的问题为,输出设定为3.3V时,空载时3.3V,带载2A的时候电压下降到2.9V。我这边尝试在输入和输出增加100uF电容,并将电感调到4.7uH(电感额度电流为8A),问题没有得到改善,带载2A时,输出依然为2.9V.能否帮忙分析原因,并给出应对措施?