Practical Comparisons of DC/DC Control Modes - Design Requirements
Part 6 of a 21 part series. This section will review the design parameters used in this head to head comparison
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When designing dc/dc converters, it's important to start by bounding the three designs. We need to know what the desired parameters that we're going to design around are. So for this comparison, we are going to pick an application where the output voltage needs to be around 1.2 volts typically, with a 12 volt input.
The output voltage needs to stay within plus or minus 5% of the typical output voltage and we know that the input voltage rail is relatively well-regulated with plus or minus 10% variation on it.
The output full load current is rated up to 8 amps for this design and we want the output voltage to have no more than 36 millivolt of deviation to a 4 amp load step where the load step is slewing at a rate of 1 amp per microsecond.
Now, we're going to create three different designs using the three different converters that we described previously that address this application. Now, when designing a converter, there are a lot of things to consider in addition to just the basic specifications.
You have to consider what the overall size of the converter that you're targeting is, what sort of power or heat dissipation you're looking for, and what expectations you have in terms of solution cost. And this will impact the selection of components and the converter that you choose.
This video is part of a series
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Practical comparisons of three DC/DC control-modes
video-playlist (21 videos)