请教一下，我板子上有2路用TPS40055做的DC-DC，一路是24V转3.3V电流4A，一路是24V转12V 电流14A。负载满功率时候我把24V输入断掉，有时候3.3V会比12V先掉电。我要实现的是24V输入断开时，12V比3.3V先掉电，如何实现？电路图见附件
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