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https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/769327/tps5450-what-happens-if-the-input-voltage-drops-below-the-configured-output-voltage
如果输入电压降至配置的输出电压以下会发生什么情况？
1、输出电压=输入电压 x 0.89 (典型最大值 占空比)。
2.输出振荡
无输出、关断。
4.其他？
