SLVAFZ0 November   2024 DRV8161 , DRV8162

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Three-Phase Gate Driver
    1. 2.1 Architecture
    2. 2.2 Layout Considerations
      1. 2.2.1 Advantages
        1. 2.2.1.1 MCU to DRV Signal Routing
        2. 2.2.1.2 Component Reduction
      2. 2.2.2 Challenges
        1. 2.2.2.1 MOSFET Placement
    3. 2.3 Typical Applications
  6. 3Half-Bridge (Single Phase) Gate Driver
    1. 3.1 Architecture
    2. 3.2 Layout Considerations
      1. 3.2.1 Advantages
        1. 3.2.1.1 MOSFET Placement
        2. 3.2.1.2 Independent Control
        3. 3.2.1.3 Ease of Replacement
      2. 3.2.2 Challenges
        1. 3.2.2.1 Longer Routing Between Gate Driver and Micro Controller
        2. 3.2.2.2 Additional Component Requirements
    3. 3.3 Typical Applications
  7. 4Summary
  8. 5References

Typical Applications

Target applications of single-half bridge driver include the robotics and factory automation market. The current market is seeing a large shift in incorporating robots and cobots in factory automation to increase production line yields by increasing speed or efficiency. BLDC motors play a key role in offering high torque and high speed required in modern factory floors.

These applications often require the MOSFET placement advantage offered by single half-bridges. Many motor designs benefit from having the driver power stage being placed closer the motor phase magnets for signal integrity and for reducing the effects of board parasitics, as well as offering smaller system size. Therefore, the flexibility of single half-bridges in routing makes it appealing for such application than a standard 3-phase gate driver.

Another emerging market for single half-bridge drivers is in the e-mobility market with e-scooters and e-Bikes. These applications deal with system challenges of transients on source nodes due to higher load or due to accidental operation in generator mode. Having reduction in board parasitcs due to short MOSFET to driver paths makes this architecture well designed to these systems.