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TPS54340纹波过大求助

Other Parts Discussed in Thread: TPS54340

TPS54340做了一个12V转5V的电源,5V电源通过FPC线到屏端又转了一下变成3V3给触摸屏供电,触摸屏很卡顿。测了一下电源的纹波很大,12V的就很大,经过DCDC到5V之后还是很大,然后经过一个LDO TLV70033后的3V3纹波也比较大,我的理解是应该输出5V的那里的纹波没有控制好,下面是电路。

请问PIN6的COMP中的R1123,C1127和1128对纹波的改善有没有帮助,请问该怎么调节?

各位高手帮忙给点思路。谢谢。