用TPS54331做降压（8-28转5V），2A重载输出时关掉输入端供电的开关电源，发现输出电压有回沟。
对比5V和EN及输入端电压Vin波形波形，发现tps54331关掉后vin会升高，导致en有效，5V有输出。
直接拔tps54331的供电电源线不会有这个问题。初步判断是供电的开关电源引起，实际使用中有没有办法避免出现输出电压回沟？难道要换带滞回功能的芯片？
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