Feedback loops aren't what they used to be. Here are some practical tips for dealing with the problems presented by modern topologies.
Gone are the days of a single feedback path, an external or discreet error amplifier, and a direct connection from output to input. Gone also are the days of voltage mode control, even though it is a better choice in some applications. The majority of power supplies manufactured today throughout the world use a similar topology. Multiple outputs with coupled inductors each feed the common summing node of a TL431
"programmable zener" error amplifier.
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