Non-Isolated Topologies Power Topology Supply Schematic Power Typical Relative Magnetics (Watts) Efficiency Cost Required DC Transfer Function (VOUT/VIN) Maximum Universal Multiple VOUT<VIN Practical Input Outputs Range Duty Cycle (90-264) VAC VOUT>VIN Range Buck 500 85 1 Single Inductor D 0.9 No No Yes No Boost 150 70 1 Single Inductor 1 _____ 1–D 0.9 No No No Yes BuckBoost 150 70 1 Single Inductor –D _____ 1–D 0.9 No No Yes Yes SEPIC 150 75 1.2 Coupled or Two Inductors D _____ 1–D 0.9 No No Yes Yes Ćuk 150 75 1.2 Coupled or Two Inductors –D _____ 1–D 0.9 No No Yes Yes DCM Flyback 150 75 1.5 Transformer Dx ________ TxVout 2xIout xLP 0.9 Yes Yes Yes Yes Forward 150 75 1.8 Transformer and Inductor 2Ns ___ xD Np 0.45 Yes Yes Yes Yes PushPull 500 80 1.8 Transformer and Inductor Ns ___ xD Np 0.45 No Yes Yes Yes HalfBridge 500 85 2 Transformer and Inductor Ns ___ xD Np 0.45 Yes Yes Yes Yes Resonant LLC 500 90 2 Frequency Dependent Based on Resonant Tank Transfer Function 0.45 Yes Yes Yes Yes Isolated Topologies __________ Transformer √ 13