SLVAFE5 September   2022 TPS92610-Q1 , TPS92611-Q1 , TPS92612-Q1 , TPS92613-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2TPS9261x-Q1 Fault Detection and Discrete Fault Detection Introduction
    1. 2.1 Discrete Fault Detection
    2. 2.2 Open Load vs Short-to-Battery Detection
    3. 2.3 Short to Ground vs Overtemperature Detection
    4. 2.4 Fault Detection Logic Summary
  5. 3Discrete Fault Detection Circuit Details
    1. 3.1 Simulation
    2. 3.2 PCB Implementation
    3. 3.3 Test Setup
    4. 3.4 Thermal Testing for Overtemperature Conditions
  6. 4Conclusion
  7. 5References

1 Introduction

Vehicle manufacturers greatly benefit from implementing circuits with detailed fault detection capabilities because this fault information can be shared with the driver through screen or LED indicators, with mechanics through the OBD port, and even to an OEM database or smart phone application over Wi-Fi, 4GLTE, or 5G wireless connections. The TPS9261x-Q1 family of LED drivers has the capability to detect an over temperature (OT), short to ground (SG), and open load (OL) or short to battery (SB) condition. However, there is only a single fault output to indicate if any of the above faults has occurred. This application note covers a method to detect these faults when implementing the TPS9261x-Q1 to drive off board LEDs.