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[FAQ] System Design Considerations for High-Power Motor Driver Applications

Please see this app note for recommendations on how to design an effective high power motor drive system

LINK: System Design Considerations for High-Power Motor Driver Applications

Abstract: Motor applications that sustain higher power ratings introduce design considerations that are not required in lower power applications. By looking at the anatomy of the power stage we can develop troubleshooting guidelines, a library of external circuits, TI driver product features, or layout techniques to combat the volatile nature of higher power systems.

Table of Contents:

  • 1 Introduction to High-Power Motor Applications
    • 1.1 Effects of a Poorly-Designed High-Power Motor Driver System
    • 1.2 Example of the High-Power Design Process
  • 2 Examining a High-Power Motor Drive System at a High Level
    • 2.1 Anatomy of the Motor Drive Power Stage and How to Troubleshoot
    • 2.2 Troubleshooting a High-Power System
  • 3 High-Power Design Through MOSFETs and MOSFET Gate Current (IDRIVE)
    • 3.1 MOSFET Gate Current
  • 4 High-Power Design Through External Components
    • 4.1 Bulk and Decoupling Capacitors
    • 4.2 RC Snubber Circuits
    • 4.3 High-Side Drain to Low-Side Source Capacitor
    • 4.4 Gate-to-GND Diodes
  • 5 High-Power Design Through a Parallel MOSFET Power Stage
  • 6 High-Power Design Through Protection
    • 6.1 VDS and VGS Monitoring
    • 6.2 Passive Gate-to-Source Pulldown Resistors
    • 6.3 Power Supply Reverse Polarity or Power Supply Cutoff Protection
  • 7 High-Power Design Through Motor Control Methods
    • 7.1 Brake versus Coast
  • 8 High-Power Design Through Layout
    • 8.1 What is a Kelvin Connection?
    • 8.2 General Layout Advice