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TPS54531,输入端欠压如何维持

Other Parts Discussed in Thread: TPS54531, WEBENCH-POWER-DESIGNER

你们好,我遇到的问题是这样的,TPS54531分别稳压到5V和3.3V正常供电是12V没什么问题,但由于工作环境会出现拖拉机打火启动时,供电电压会短时间下降至5V或者6V,这时供电欠压,如何维持TPS54531输出的稳定。

1.TPS54531输出端加大电容(多大参数)维持输出的电压稳定。

2.供电端加大电容维持输入端的稳定。

这两种方法哪种起主要作用,带载电容能够起到作用吗。期待你们的回答谢谢