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TPS55289: 输出纹波大

Part Number: TPS55289

各位老大,求教:

3.4V输入,输出电压大于2.8V输出后(0.1A),输出纹波很大(Vripp=0.5V, Tripp=124us)。电感4.7uH,输出电容88uF。请教如何改进?哪些方向可以调整?