Contents
What is transient output?
Output transient response is one important characteristic of an output voltage. This “transient” means that the output current, which means the load current, fluctuates rapidly, and so a more accurate term would be the output voltage load transient response characteristic.
Which control the output of the power supply?
Power control, (a.k.a. power mode or power loop) is a third control mode that can be added to a variety of Spellman supplies to provide another means to control and regulate the output of the supply. Voltage mode and current mode are the primary controlling modes of most units.
How does a line transient affect a power supply?
A load transient injects disturbance into the output by stepping the load current, and a line transient does so by stepping the line voltage. The supply’s output response demonstrates its ability to attenuate the various frequency components of a line or load step.
How to measure ripple and transient in power supplies?
The start and end currents, along with slew rate, also determine the time that the current is changing and should match the specified conditions. To make the transient response measurement, the user will need two scope channels. The first probe should be across the output of the power supply close to the output pins or regulation point.
Line and load transient measurements illustrate a power supply’s ability to respond to abrupt changes in line voltage and load current. The test measurements can reveal significant overshoot or sustained ringing in the output as it attempts to maintain regulation. Line transient response is different from power-supply rejection ratio (PSRR).
What’s the difference between line transient and load transient?
A load transient is similar, except that it is a load current step and injects a disturbance into the power supply output. In contrast, a line transient injects the disturbance at the input.