Limitations
Continuous mode has the following disadvantages, which complicate the control of the converter:
- The voltage feedback loop requires a lower bandwidth due to a zero in the response of the converter.
- The current feedback loop used in current mode control needs slope compensation in cases where the duty cycle is above 50%.
- The power switches are now turning on with positive current flow - this means that in addition to turn-off speed, the switch turn-on speed is also important for efficiency and reducing waste heat in the switching element.
Discontinuous mode has the following disadvantages, which limit the efficiency of the converter:
- High RMS and peak currents in the design
- High flux excursions in the inductor
Read more about this topic: Flyback Converter
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