when we give the power supply a step load and look at its transient response) we can never be completely certain of how far away from instability we are.īy frequency domain analysis, what I mean is that I inject a small sinusoid of a certain frequency, let’s say 10 Hz, into my power supply and then measure how the shape of this sinusoid is modified by the time it goes through the PSU and eventually comes out. What is frequency domain design and why is it better than the time domain when applied to power supplies?Īs mentioned earlier, most experts design power supplies in the frequency domain, the main reason is that when we work in the frequency domain, we obtain a lot more information about the relative stability of our power supplies.
