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关于TPS79650芯片的输入电压疑惑



TPS796xx手册中提到VIN5.5V。选择TPS79650输出5V电压,那么输入电压应该满足5V<VIN5.5V
常规5V电源输出的电压会在5V上下波动,不一定满足大于5V条件;选择过高的电压又担心损坏芯片。
请问这款芯片的应用背景是怎样的?