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Linear vs. switching power supplies Not always an easy choice(3)

source:Industry News Popular:adapter release time:2021-09-02 13:54:13 Article author:sznbone

  There is also the issue of transient response to sudden changes in load. The all-analog linear supply can be tuned to optimally respond to step-changes in load. The goal is to respond fast without overshoot or ringing, and a properly designed supply can provide this. In contrast, the closed-loop dynamics of the switching power supply are much more difficult to control. The switching supply may be slower or excessively overshoot and ring before it stabilizes, depending on design specifics and clock frequency.

TRANSIENT RESPONSE(图1)

  There is no doubt that the switching supply offers major benefits in efficiency, weight and size. But before assuming it is the right or only choice, engineers should consider the application as well as the impact of noise and ripple. There are installations where these attributes are not the priorities; instead, low ripple and output noise are the top priorities along with superior transient performance. Applications in this category include extremely low-noise amplifiers, advanced signal processing and data acquisition systems (including sensors, multiplexers, A/D converters and sample and hold circuits) and precision automatic test equipment (ATE) and laboratory test equipment.


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