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This slide shows a comparison of the SPM15 with two competitive models carrying a nominal 20W rating. At the top is the thermal performance of the Murata SPM15-050-Q48. This model delivers full rated output of 3A and 15W, at a nominal 24V input voltage, over the full range of operating temperatures of -40°C to 85°C. The 24V input is most typically encountered in industrial equipment applications. Compare this first with Competitor A’s device with a nominal output rating of 5V at 4A, or 20W. At 85°C, this 20W unit delivers less than 30% of its rated 20W, or about 5W. At temperatures above about 70°C, Murata’s 15W SPM outperforms Competitor A. In the second example, Competitor B also offers a 20W product with a 4:1 input range. For the 5V output model shown, de-rating starts at 55°C, the crossover for this part occurs at approximately 70°C. Note that competitor B does offer an optional heatsink to improve thermal performance, but this adds cost and height to the unit. A third competitor, not shown on the slide, also has a comparable 20W product, with the cross over for these models occurring at about 66°C. Thus, while competitive units are available with higher nominal power ratings, the SPM demonstrates better thermal performance at elevated temperatures.
