The use of pseudo-random binary sequences to predict a DC-DC converter´s control-to-ouput transfer function in continuous conduction mode

The design of a dc-dc converter´s regulation loop requires prior knowledge of its open-loop frequency response characteristics which are generally obtained experimentally using a prototype and a network analyzer or through small-signal models. In order to obtain these characteristics more precisely than through modeling without having to build a circuit prototype beforehand, we propose the use of time-domain simulation of the dc-dc converter using a pseudo-random binary sequence to perturb the converter´s duty cycle in order to obtain its ac small-signal control-to-output frequency response characteristics. The technique introduced in this paper offers a new strategy for obtaining data which is essential for a converter´s regulator loop design