SLPS598E May   2017  – June 2024 CSD88584Q5DC

PRODUCTION DATA  

  1.   1
  2. 1Features
  3. 2Applications
  4. 3Description
  5. 4Specifications
    1. 4.1 Absolute Maximum Ratings
    2. 4.2 Recommended Operating Conditions
    3. 4.3 Power Block Performance
    4. 4.4 Thermal Information
    5. 4.5 Electrical Characteristics
    6. 4.6 Typical Power Block Device Characteristics
    7. 4.7 Typical Power Block MOSFET Characteristics
  6. 5Application and Implementation
    1. 5.1 Application Information
    2. 5.2 Brushless DC Motor With Trapezoidal Control
    3. 5.3 Power Loss Curves
    4. 5.4 Safe Operating Area (SOA) Curve
    5. 5.5 Normalized Power Loss Curves
    6. 5.6 Design Example – Regulate Current to Maintain Safe Operation
    7. 5.7 Design Example – Regulate Board and Case Temperature to Maintain Safe Operation
      1. 5.7.1 Operating Conditions
      2. 5.7.2 Calculating Power Loss
      3. 5.7.3 Calculating SOA Adjustments
  7. 6Layout
    1. 6.1 Layout Guidelines
      1. 6.1.1 Electrical Performance
      2. 6.1.2 Thermal Considerations
    2. 6.2 Layout Example
  8. 7Device and Documentation Support
    1. 7.1 Receiving Notification of Documentation Updates
    2. 7.2 Support Resources
    3. 7.3 Trademarks
    4. 7.4 Electrostatic Discharge Caution
    5. 7.5 Glossary
  9. 8Revision History
  10. 9Mechanical, Packaging, and Orderable Information

5.7.2 Calculating Power Loss

  • Power loss at 40A ≈ 4.7W (Figure 4-1)
  • Normalized power loss for switching frequency ≈ 1.24 (Figure 4-4)
  • Normalized power loss for input voltage ≈ 1.09 (Figure 4-5)
  • Normalized power loss for duty cycle ≈ 1.06 (Figure 4-6)
  • Final calculated power loss = 4.7W × 1.24 × 1.09 × 1.06 ≈ 6.7W