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TPS5430芯片输出电压波动

Other Parts Discussed in Thread: TPS5430

用TPS5430把12V电压降压成5V输出,5V上接有一个3.3V的LDO,3.3V上有1000多uF的电容,当使能3.3V的LDO时,5V电压会有一个大的波动,最高有5.7V,最低有4.4V,现在3.3V的LDO在另一块板上没法改动,有什么方法使5V输出波动变小吗?