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使用TLV431对TPS659037输出电压进行钳位的问题

Other Parts Discussed in Thread: TPS659037

如上图所示,V3_3D是TPS659037其中一路BUCK输出电压(3.3V),V1_8D是其中一路LDO输出电压(1.8V)。据一款DEMO上说这个电路可以使得在意外掉电时,V3_3D永远不会低于V1_8D。目前我只能看出来在输出电压都正常时,Q26这个P管不导通,不会影响输出回路,但是掉电时是怎么进行钳位的没有看出来,仿真也未果。请高手帮下忙,多谢!