Critically discontinuous operationIt is the transition point between DCM and CCM. With critically discontinuous modeof operation, primary winding current starts from zero at every cycle. Secondarycurrent goes down to zero just when primary winding current starts ramping upagain.Off time + on time = fly back periodThere is no idle period. Equation for DCM can apply for it.Given a constant turn on period, output current is a function ofturn off period. Therule of thumb for 50% duty cycle, you have to transfer twice thtotal output powerwithin the on period.Po = LfIpk2/2For ¼the original power, frequency will double. At no load frequencywill go veryveryhigh so a minimum and maximum load must be determined.
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