6. MOSFET Switching Circuits
MOSFET switching circuits operate as on/off switches in various applications like power converters and digital logic. The chapter covers switching operations, losses, gate drive circuits, various topologies, and practical selection considerations for MOSFETs. Key focus areas include the importance of minimizing R_DS(on) and switching losses for improved efficiency.
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Sections
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What we have learnt
- MOSFETs operate in either ON or OFF states for switching applications.
- Dynamic and conduction losses are crucial considerations in MOSFET power dissipation calculations.
- Different switching topologies have distinct advantages and challenges in design.
Key Concepts
- -- ON State
- In the ON state, the MOSFET exhibits low R_DS(on), allowing current to flow with minimal resistance.
- -- OFF State
- In the OFF state, the MOSFET presents a high resistance, effectively blocking current flow.
- -- Switching Losses
- The energy lost due to the MOSFET transitioning between ON and OFF states, influenced by switching frequency and times.
- -- Gate Drive Circuits
- Circuits that provide the necessary voltage and current to the gate of MOSFETs for effective switching.
- -- Snubber Networks
- Passive circuits used to suppress voltage spikes and overvoltages caused by inductive loads.
Additional Learning Materials
Supplementary resources to enhance your learning experience.