Buck-boost - 2 FETs, 2 diodes, 1 or 2 inductors, single stage energy conversion, 1 complex conjugate pole pair in ccm (continuous conduction mode operation), 1 right half plane zero in ccm, moderate bandwidth, noisy input & output require pre- & post-filtering, low efficiency at low output voltage due to 2 diodes, moderate efficiency at higher output voltages.
Cuk/boost-buck - 2 FETs, 2 diodes, 2 inductors, dual stage energy conversion, 2 complex conjugate pole pairs in ccm , 2 right half plane zeros in ccm, low bandwidth, quiet input & output require no pre- or post-filtering, low efficiency at low output voltage due to 2 diodes, low to moderate efficiency at higher output voltages.
Sepic - 1 FET, 1 diode, 2 inductors, dual stage energy conversion, 2 complex conjugate pole pairs in ccm, 3 right half plane zeros in ccm, lowest bandwidth, quiet input & noisy output require no pre-filtering but requires post-filtering, moderate efficiency at low output voltage due to 1 diode, moderate efficiency at higher output voltages.
Isolated flyback - 1 FET, 1 diode, 1 transformer gapped to store energy, single stage energy conversion, 1 complex conjugate pole pair in ccm, 1 right half plane zero in ccm, moderate bandwidth, noisy input & output require pre- & post-filtering, moderate efficiency at low output voltage due to 1 diode, moderate efficiency at higher output voltages. Similar to buck-boost except isolated due to xfmr.
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