Transcription of 'Seminar 800 Topic 7 - Control Loop Design' - TI.com
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'Seminar 800 Topic 7 - Control Loop Design' - TI.com
Lloyd Dixonmargin. Thus a phase lag of 117 at fc correspondsto a 63 phase 1 shows the gain -phase plots of two aver-age current mode Control loops and their transientresponse to a step change in load current. Bothloops cross over at 10 plots are simplified gain -phase plots thatare convenient for depicting the frequency charac-teristics of a feedback 1 POLE loop has one active pole from 10 Hzto over lookHz. Thus the phase lag atfc is 90 andthe phase margin is also 90 . Note that with the -1slope associated with a single pole, the gain doesnot rise rapidly at lower frequencies. The lowerSummary:This paper surveys many practical aspects ofcontrol circuit design . topics include: differentapproaches for achieving Nyquist stability criteria,transient response vs. phase margin, low frequencyaccuracy vs. the shape of the Bode plot, why it isdangerous to depend on conditional stability,achieving the maximum crossover frequency of aswitched loop., other factors which may limit loopbandwidth, sources of error, and where to place thegain needed for practical aspects include large signalbehavior and how to minimize offset error delays ofcompensation capacitors in the feedback Loop BasicsThe Control loop in a high perfonnance switchingpower supply requires high gain, to achieve goodregulation, and high bandwidth, to achieve rapidresponse to sudden changes of line or loop gain inevitably declines at highfrequency, limiting
Control Loop Design Examples Definitions: Rt: "transresistance"-the translation of inductor current to a voltage, Vi' In its simplest form,
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