Most manufacturers offer modular power supplies with several temperature ranges to choose from: commercial grade, industrial grade, military grade, etc. When selecting a modular power supply, it's crucial to consider the actual operating temperature range required. Different temperature ratings involve different materials and manufacturing processes, resulting in significant price differences. Inappropriate selection can affect application, so careful consideration is essential. There are two main selection methods: First, choose based on power consumption and packaging. If, given a fixed size (packaging), the actual power consumption is close to the rated power, then the module's rated temperature range must strictly meet the actual needs, or even have a slight margin. Second, choose based on the temperature range itself. If a product with a smaller temperature range is chosen due to cost considerations, but the temperature is sometimes approaching its limit, what can be done? Derating. This involves selecting a product with a higher power rating or a larger package. This "overpowered" approach results in a lower temperature rise, mitigating the problem to some extent. The derating percentage varies depending on the power rating, generally 3-10W/℃ for 50W and above. In short, you can either choose a product with a wide temperature range, which allows for more efficient power utilization and a smaller package, but is more expensive; or choose a product with a general temperature range, which is cheaper, but requires a larger power margin and package size. A compromise should be made.
Grade of Commerce (0℃ to +70℃)
Industrial grade (-40℃ to +85℃)
Military grade (-55℃ to +125℃)
Variable frequency and fixed frequency
Like all switching devices, DC/DC converters generate noise during operation, making filtering performance a crucial selection criterion. Integrated DC/DC converters typically employ either variable frequency switching (VFSS) or fixed frequency switching (FPS) technology. VFSS converters, requiring continuous adjustments based on load conditions, experience bandwidth widening, increasing filter complexity. FPS converters, on the other hand, are much simpler in this regard and can even utilize LC filters.
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