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TPS53355: TPS53355 12V转0.9V,21.2A,电感选择

Part Number: TPS53355

TPS53355 12V转0.9V,21.2A,开关频率500K,纹波系数0.3,电感选择:

1.通过公式计算得出最小电感是0.262uH,电感选择0.33uH,带入电感公式计算Iind(ripple)=6.36A,纹波系数为6.36/21.2=0.238,不满足手册0.25-0.5要求;

2.问题1:纹波系数是否必须满足0.25-0.5?如果不满足会有什么问题?

3.问题2:官方提供的TPS53355计算excel表格,纹波系数又调整为0.2-0.4,和手册不一致,已哪个为准?