Q: Where and why is the flyback approach used?Ī: It is generally used in what is considered the low-to-medium power range, around 100 to 250 W or less. It has two distinct operating phases, with a basic principle that power from the input side is transferred to the output side only when the primary-side switch is off and its current flow is zero or close to it. Other factors include isolated versus non-isolated design, which is defined by the application.Ī: A flyback converter is a simple implementation of a switch-mode power supply (SMPS), and it can be designed to deliver a DC output from either an AC or DC input, with outputs both lower and higher than the supply source (buck/boost operation). Of course, cost is almost always among them, but technical issues are regulation, accuracy, transient performance, ripple and filtering, EMI generation, efficiency at specific load points and across a load range, size, weight, BOM complexity, stability, temperature performance, and performance despite component tolerances. Q: What are some of the performance parameters?Ī: There are many. Q: What is the role of a power converter?Ī: In principle, it’s simple: take a power source (sometimes regulated, sometimes not) and transform it into a regulated output voltage at up to a specific current level, or deliver a regulated current with a required compliance voltage. The flyback design is a converter approach which has been used for 70+ years and is still in use, now using an IC as a controller and various approaches to physical implementation. There’s a wide and diverse array of power-supply converter topologies among which to choose, each with tradeoffs in their various performance attributes and cost. Among the many available topologies used for power-supply converters, the flyback design offers some distinct advantages along with unique idiosyncrasies.
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