Design of high performance point of load converters with ultra-low output voltage ripple

This paper introduces a simple and practical design solution for high performance integrated power management Point of Load (POL) with ultra-low output voltage ripple. The simple design is based on the commonly used, simple and effective analog voltage-mode-control. Using two-stage LC output filter is very effective technique to decrease the output voltage ripple, however it generates 4^th order system which cannot be stabilized using regular voltage-mode-control. However, in this paper two design techniques for the output filter are introduced to keep the total POL system stable. Through this paper, the advantage of the two proposed techniques has been made clear through analyzing their analytical theory and simulation. Moreover, the two proposed techniques have been compared for their effect on the POL converter performances. Finally, an experimental set-up has been test to validate the proposed technique and prove the ability of designing a high performance POL converter with ultra-low output voltage ripple. Experimental results have agreed with the analytical and simulation results in a good matching.