The Standard regulator is usually best for AC-powered applications, where the low cost and high load current make it the ideal choice. In AC-powered applications, the voltage across the regulator is usually at least 3V or more, so dropout voltage is not critical.
It is possible for RO to be negative – an undesirable characteristic often caused by poor layout design in the regulator wiring resulting in inadvertent positive feedback. With negative output resistance the output voltage increases with the load current.
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