Fast Line Voltage Transient Response

Fast line voltage transient response is a characteristic of a power supply’s (i.e. DC-DC converter) ability to respond to abrupt changes in line (input) voltage. Fast Line Voltage Transient Response implies that the power supply is able to quickly regulate changes in the input voltage.  This means that the output voltage will not be affected by changes in the input voltage.
Line voltage transients are measured in volts per second (or V/μs). For power supply’s, this spec is the maximum line voltage transient that it can regulate (handle, without experiencing an unwanted change in output voltage). 
Line transient response is different from power-supply rejection ratio (PSRR).  In some applications fast voltage transients cannot be dissipated as heat; they need to be regulated.
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Line and Load Transient Testing for Power Supplies
Fast input-voltage transient response
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