SLVAFS9 August   2024 DRV8316 , DRV8317

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Power Loss and Performance Expectations
  6. 3Lab Data and Analysis
    1. 3.1 Current Output, Rds(on), and PWM Frequency
    2. 3.2 Slew Rate and Device
    3. 3.3 Temporal Thermal Analysis
    4. 3.4 PCB Design
  7. 4Thermal Design Recommendations
  8. 5Summary
  9. 6References

1 Introduction

Some of Texas Instruments' integrated FET motor drivers include thermal calculators that can be found on TI.com. These can be used to predict thermal performance based on system parameters, but lab data can provide additional context for the information presented by the data sheet and calculator. This application note provides real-world data explaining how settings such as PWM frequency, slew rate, and electrical characteristics affect the total power loss during operation. This document also profiles how the DRV8317 heats up over time during operation. Lastly, this application note contains design recommendations to assist in creating products with improved thermal performance.

Throughout this application note, two devices are the subject of the lab tests:

  • DRV8317
    The DRV8317 has a small footprint and thermal characteristics that make the DRV8317 a smart design choice for low voltage and small form factor applications. The integrated features further reduce board size and bill of materials cost, making design easier.
  • DRV8316
    The DRV8316 is similar to DRV8317, but the DRV8316 has higher power output capabilities and can include an integrated buck regulator.