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请教关于54040输入电压的问题

Other Parts Discussed in Thread: TPS54040

目前我考虑的方案中54040的输入电压取自总线,总线供电的同时传输信号,传输信号时总线电压会有相应频率和幅度的幅值跌落(跌落后的电压幅值任满足54040工作要求),跌落的瞬间54040输出同样会有跌落,这是否是54040的保护机制,因为缓慢的跌落不会有此问题。

此方案中又不能加大电容,输入端加大电容会影响通讯,输出端加大电容会影响54040启动时间,该如何解决此问题?