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TPS5430输出电压波动

Other Parts Discussed in Thread: TPS5430

用TPS5430把电压从12V降到5V,同时在5V上有一个LDO输出3.3V,此3.3V上的电容有1000多uF,当3.3V的LDO使能时,5V会有一个大的波动,最高达到5.7V,最低有4.4V,现在3.3V的LDO在另外一块板子上没法改,有什么方法使5V的波动幅度减小,最高到5.2V,最低4.6V。