Analog Circuits | 6. MOSFET Switching Circuits by Pavan | Learn Smarter
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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.

Sections

  • 6

    Mosfet Switching Circuits

    This section covers the operation and key concepts of MOSFETs used as switching devices in various applications.

    Learning Practice

  • 6.1

    Introduction To Mosfet Switching

    This section introduces MOSFETs as on/off switches in electronic circuits, highlighting their key applications in power converters, digital logic, and PWM motor control.

    Learning Practice

  • 6.2

    Basic Switching Operation

    This section covers the fundamental states of MOSFETs during switching operations, discussing their characteristics in the ON and OFF states.

    Learning Practice

  • 6.2.1

    Switching States

    This section explains the operational states of MOSFETs as switches, focusing on 'ON' and 'OFF' states and their implications for power dissipation.

    Learning Practice

  • 6.2.2

    Switching Waveforms

    Switching waveforms involve the time-dependent behavior of MOSFETs during the switching process, highlighting turn-on delay and rise/fall times.

    Learning Practice

  • 6.3

    Switching Losses

    This section describes MOSFET switching losses, including dynamic losses, conduction losses, and total power dissipation.

    Learning Practice

  • 6.3.1

    Dynamic Losses

    Dynamic losses in MOSFET circuits are critical for understanding energy dissipation during switching operations.

    Learning Practice

  • 6.3.2

    Conduction Losses

    Conduction losses in MOSFETs are a significant source of power dissipation during operation and can impact the overall efficiency of switching circuits.

    Learning Practice

  • 6.3.3

    Total Power Dissipation

    This section covers the calculation of total power dissipation in MOSFET switching circuits, factoring in dynamic, conduction, and leakage losses.

    Learning Practice

  • 6.4

    Gate Drive Circuits

    This section covers the essential requirements and configurations of gate drive circuits used in MOSFET applications.

    Learning Practice

  • 6.4.1

    Requirements

    This section outlines the essential requirements for effective gate drive circuits in MOSFET switching applications.

    Learning Practice

  • 6.4.2

    Bootstrap Circuit (For High-Side Nmos)

    The bootstrap circuit is essential for driving high-side NMOS transistors by providing the necessary gate voltage.

    Learning Practice

  • 6.5

    Switching Topologies

    This section explores various switching topologies including low-side, high-side, and half-bridge configurations in MOSFET design.

    Learning Practice

  • 6.5.1

    Low-Side Switch

    The Low-Side Switch is a fundamental switching topology using a MOSFET to control the load connected to ground.

    Learning Practice

  • 6.5.2

    High-Side Switch

    High-side switches employ MOSFETs to control load voltage while facing challenges such as needing higher gate voltages.

    Learning Practice

  • 6.5.3

    Half-Bridge

    The half-bridge topology is an essential switching configuration for MOSFET circuits, consisting of two transistors and allowing effective load control.

    Learning Practice

  • 6.6

    Protection Circuits

    Protection circuits ensure the safe operation of MOSFETs by managing overcurrent scenarios and voltage transients.

    Learning Practice

  • 6.6.1

    Snubber Networks

    Snubber networks are used to suppress voltage spikes in MOSFET circuits, improving reliability and performance.

    Learning Practice

  • 6.6.2

    Overcurrent Protection

    This section covers the importance of overcurrent protection in MOSFET circuits, focusing on desaturation detection methods.

    Learning Practice

  • 6.7

    Summary

    This section summarizes key concepts related to MOSFET switching operations, including states, losses, topologies, and design focus.

    Learning Practice

References

ee4-ac-6.pdf

Class Notes

Memorization

What we have learnt

  • MOSFETs operate in either O...
  • Dynamic and conduction loss...
  • Different switching topolog...

Final Test

Revision Tests