Switch-mode power-supply design can be a mysterious thing if you do not know how and where to start, because there is a great variety of topologies and controller types from which to choose. In this blog series I will describe how to pick the most fitting power supply topology for your application and what you need to know to get there. The best starting point is usually a dedicated specification for your application. This specification should at least include information about the input-voltage range, output voltage and maximum load current. However, choosing the best-fitting topology and/or system solution will be easier if you can also answer some of the subsequent questions:
Of course, all of this information is not always necessary. The more detailed your power-supply specification is, however, the easier it is to pick the best-fitting topology and the best performing components.
The most common switch-mode power-supply topologies are:
These topologies are supported by TI’s Power Stage Designer 3.0 tool.
Table 1 summarizes the most common parameters for power supply specifications.
Table 1: Summary of helpful specification parameters
In my next post, I will describe how to pick the most fitting topology based on the parameters of your specification.
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