The amount of time, measured in in milliseconds that a
power supply unit (PSU) can maintain output
within the specified voltage range after a loss of input power. The hold-up time
is thje amount of time that the system can continue to run without resetting or
rebooting during a power interruption. Some power supplies may also includes a
battery to maintain power in the event of a power outage. These are called an
uninterruptible power supply.
Power supply design optimizes capacitors Microprocessor-based devices require a regulated power supply unit that detects the loss of input power and continues to supply power for the length of time it takes to complete a memory backup.
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