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The comparison showed that the 20 A planar Schottky had the lowest total power supply efficiency of 78.3%. When the 60 A rated devices were substituted in the same power supply, the efficiency improved by 0.8% and 0.9%. These improvements translate into a power savings of 2.35 W and 2.77 W, respectively. The 40 A TMBS rectifier had the best efficiency at 79.6%. This resulted in a efficiency improvement of 1.3% and a power savings of 3.72 W as compared to the 20 A planar Schottky rectifier. Even when the 40 A TMBS rectifier was used to replace the 60 A planar devices, the improvement in efficiency was still positive at 0.4%. To further demonstrate the capabilities of the new TMBS devices, a second test evaluated TMBS rectifiers with ratings of 40 A and 100 V in a 120-W adapter. The typical solution for this application is a synchronous rectification approach implemented with two 40 A, 100 V MOSFETs and a matching driver IC. As shown in this table, the pair of TMBS rectifiers under full-rated 120 W output conditions provide the same total adapter efficiency of 87% as the more complicated, costly and less robust synchronous rectification solution.
