Proposed Switching Losses Model for Integrated Point-of-Load Synchronous Buck Converters


Nowadays, point-of-load (POL) converters' investments are counted as a main part in power management markets; especially the synchronous buck converters. These days's products forces designers to highly integrate POL converters by increasing the switching frequency; so the newest technology has used megahertz range to get this target. On the opposite hand, increasing switching frequency means that increasing the switching losses. Therefore, it's terribly important to optimize the operating switching frequency tradeoff, which needs an accurate model taking in thought the converter operating conditions. This paper presents an correct mathematical loss model taking in thought the physical behavior of the MOSFET switch additionally to the converter operating conditions. This model introduces accurate equations for each switching intervals and thus accurate loss calculations. An integrated POL synchronous buck converter of 5 MHz, five-one.eight V/3 A prototype is fabricated. The results of the proposed model are compared with simulation and experimental results under variable operating conditions. Smart matching between the mathematical, experimental, and simulation results are obtained.

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