Power Supply Management — Principles , Problems , and Parts

The monitoring and control of a growing number of power-supply voltage rails has been vital for safety, economy, durability, and proper operation of electronic systems for many years—especially for systems employing microprocessors. Determining whether a voltage rail is above a threshold or within an operating window— and whether that voltage is powered on or off in the correct sequence with respect to the other rails—is crucial to operational reliability and safety.