LM2940使用疑问

Output Voltage Trimmed Before Assembly

芯片是固定输出电压的。

在芯片组装前就已经将输出电压trim好了，保证了输出电压的精度。

Mirror Image Insertion Protection这个怎么理解？

Mirror-image insertion protection means that a regulator is designed for use when a voltage, usually not higher than the maximum input voltage of the regulator, is applied to its output pin while its input terminal is at a low voltage, volt-free or grounded. Some regulators can continuously withstand this situation; others might only manage it for a limited time such as 60 seconds, as usually specified in the datasheet. This situation can occur when a three terminal regulator is incorrectly mounted for example on a PCB, with the output terminal connected to the unregulated DC input and the input connected to the load. Mirror-image insertion protection is also important when a regulator circuit is used in battery charging circuits, when external power fails or is not turned on and the output terminal remains at battery voltage

怎么要同时施加直流与交流信号，LDO输出阻抗到底怎么测试呢？

》》》》就是在直流的基础上叠加一个交流信号。

Neil,您好！

       感谢您的解答，有没有LDO输出阻抗测试以及电源输出阻抗测试文档给我们分享下呢？

谢谢！