The load-transient response characteristic and the line-transient response characteristic are characteristics that show the amount of output voltage change and responsiveness of the DC/DC and voltage regulator when the output current or the input voltage suddenly change.
Load-transient response characteristic
This shows how much the output voltage changes and how long takes it to converge when the output current suddenly changes.
The output voltage change amount is affected by the IC control method, the output current conditions, and the output capacity, etc.
For the voltage regulator, high-speed type voltage regulators have better load-transient response characteristics, but the quiescent current becomes large.
For DC/DC, the control method causes a large change in the load-transient response characteristic, so a product that uses a control method that allows a fast transient response must be selected.
In addition, using the load transient change, it is possible to determine the product stability from the output voltage response wavelength.
Line-transient response characteristic
This shows how much the output voltage changes and how long it takes it to converge when the input voltage suddenly changes.
The line-transient response characteristic is also affected by the IC control method, the input voltage conditions, and the output capacity, etc., the same as is the load-transient response characteristic.
Generally, products with a good load-transient response characteristic tend to also have a good line-transient response characteristic.
