Two diodes change demagnetization-signal polarity


Posted on Apr 4, 2012

Power-supply designers usually like flyback converters to operate in DCM (discontinuous-conduction mode) rather than in CCM (continuous-conduction mode). In DCM, the flyback converter is a first-order system at low frequencies, which eases the feedback-loop compensation. You can use a low-cost secondary rectifier, thanks to soft blocking conditions. In DCM, IP goes to zero, and the diode stops conducting, whereas the power-switch turn-on event in CCM forces the diode to brutally stop conducting.






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