Chassis & Safety Solutions

Robust power-path and three-phase motor-drive semiconductor solutions for electric steering, braking, active suspension, stability control and other safety-critical chassis actuators.

Automotive chassis and safety electronics application

Protected high-current power delivery for safety-critical chassis actuators

Modern chassis and safety systems use electrically driven pumps, steering motors, brake actuators and suspension mechanisms that must respond quickly and predictably from a noisy 12 V or 48 V vehicle supply. A practical architecture combines a high-current bus switch for controlled power-path connection, inrush management and rapid fault isolation with a three-phase full bridge that delivers bidirectional torque to a BLDC or PMSM actuator. Coordinated PWM control, current feedback and diagnostic supervision help the system maintain low conduction loss, fast protection response and stable actuator performance during cranking, load-dump, thermal stress and dynamic vehicle maneuvers.

Key advantages

  • High-current vehicle-bus switching
  • Low conduction loss
  • Controlled inrush current
  • Fast fault isolation
  • Bidirectional motor torque
  • Efficient three-phase actuation
  • Rapid overcurrent response
  • Current and thermal feedback readiness
  • 12 V / 48 V platform scalability
  • Support for regenerative current paths
  • Robust transient tolerance
  • Safety-diagnostic integration

Chassis and safety architecture and product mapping

Chassis & Safety Actuator Architecture

Protected vehicle-bus power switching, three-phase full-bridge actuation and feedback paths for steering, braking, suspension and stability-control systems.

Chassis & Safety Solutions Editable two-to-one SVG block diagram for automotive chassis and safety systems. Interactive MOT-supported blocks are Bus Switch and Three-Phase Full Bridge. CHASSIS & SAFETY SOLUTIONS 12 V / 48 V Vehicle Bus Fuse · EMI · surge environment Bus Switch Power connect · inrush control · fault isolation Three-Phase Full Bridge Bidirectional BLDC / PMSM actuator drive M Chassis & Safety Actuator EPS · brake pump · active suspension · stability control PROTECTED DC BUS SAFETY ECU: ENABLE · PWM · CURRENT LIMIT · DIAGNOSTICS POSITION / CURRENT / TEMPERATURE FEEDBACK Filled blocks: MOT supported device candidates Outline blocks: system-level functional blocks MOT Semiconductor Solutions
Tip: Select a block in the diagram or choose a module from the list. On mobile, swipe horizontally to view the full diagram.

Explore the chassis and safety power architecture through the interactive block diagram. Select Bus Switch or Three-Phase Full Bridge to review each function, key engineering considerations and placeholder MOT device mapping.

About the solution

Controlled vehicle-bus connection followed by bidirectional three-phase actuation

The vehicle supply enters through filtering and transient protection, then passes through a high-current bus switch that controls startup, limits inrush and isolates the downstream drive during faults. The protected DC bus feeds a three-phase full bridge that regulates current and torque in the chassis actuator. A safety ECU supplies enable and PWM commands while monitoring phase current, position, temperature and diagnostic status to coordinate predictable shutdown or degraded operation when abnormal conditions are detected.

Scalable for electric steering, brake pumps, active suspension and stability-control actuators

The same power-path and bridge functions can be adapted for electric power steering, electro-hydraulic brake or ABS pumps, brake-by-wire actuators, active suspension compressors, roll-control motors and other chassis mechanisms. Semiconductor current rating, voltage margin, bridge topology, switching frequency, thermal design and diagnostic coverage can be scaled for 12 V and 48 V vehicle platforms and for different actuator duty cycles.

Low-loss MOSFETs and power-path devices for safety-critical switching positions

High-current bus-switch MOSFETs, back-to-back power-path devices, three-phase bridge MOSFETs, clamp and freewheel diodes, gate-driving functions, current-sense devices and protection supervisors form a practical semiconductor platform for compact, efficient and diagnosable chassis-control electronics.

Controlled vehicle-bus connection followed by bidirectional three-phase actuation

The vehicle supply enters through filtering and transient protection, then passes through a high-current bus switch that controls startup, limits inrush and isolates the downstream drive during faults. The protected DC bus feeds a three-phase full bridge that regulates current and torque in the chassis actuator. A safety ECU supplies enable and PWM commands while monitoring phase current, position, temperature and diagnostic status to coordinate predictable shutdown or degraded operation when abnormal conditions are detected.

Scalable for electric steering, brake pumps, active suspension and stability-control actuators

The same power-path and bridge functions can be adapted for electric power steering, electro-hydraulic brake or ABS pumps, brake-by-wire actuators, active suspension compressors, roll-control motors and other chassis mechanisms. Semiconductor current rating, voltage margin, bridge topology, switching frequency, thermal design and diagnostic coverage can be scaled for 12 V and 48 V vehicle platforms and for different actuator duty cycles.

Low-loss MOSFETs and power-path devices for safety-critical switching positions

High-current bus-switch MOSFETs, back-to-back power-path devices, three-phase bridge MOSFETs, clamp and freewheel diodes, gate-driving functions, current-sense devices and protection supervisors form a practical semiconductor platform for compact, efficient and diagnosable chassis-control electronics.

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