Transcription of DC-DC Converters Feedback and Control - ON Semiconductor
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DC-DC Converters Feedback and Control - ON Semiconductor
DC-DC Converters Feedback and Feedback generalities Conditions for stability Poles and zeros Phase margin and quality coefficient Undershoot and crossover frequency Compensating the converter Compensating with a TL431 Watch the optocoupler! Compensating a DCM flyback Compensating a CCM flyback Simulation and bench results Feedback generalities Conditions for stability Poles and zeros Phase margin and quality coefficient Undershoot and crossover frequency Compensating the converter Compensating with a TL431 Watch the optocoupler! Compensating a DCM flyback Compensating a CCM flyback Simulation and bench results is Feedback ? A target is assigned to one or several state-variables, Vout= 12 V. A circuitry monitors Voutdeviations related to Vin, Iout, T etc. If Voutdeviates from its target, an error is created and fed-backto the power stage for action.
www.onsemi.com 3 Agenda Feedback generalities Conditions for stability Poles and zeros Phase margin and quality coefficient Undershoot and crossover frequency Compensating the converter
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