SLVAEX0 October   2020 TPS1H000-Q1 , TPS1H100-Q1 , TPS1H200A-Q1 , TPS1HA08-Q1 , TPS1HB16-Q1 , TPS1HB50-Q1 , TPS2HB16-Q1 , TPS2HB50-Q1 , TPS4H000-Q1 , TPS4H160-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Normal Operation Diagnostics
    1. 2.1 Configuring Diagnostics With SEL/SELx Pin
      1. 2.1.1 Diagnostics Select Pin: SEL1
      2. 2.1.2 Diagnostics Select Pin: SELx
    2. 2.2 Operating Current Measurements Using the SNS/CS Pin
      1. 2.2.1 Internal/External Factor: Load Current Through Device
      2. 2.2.2 External Factor: Analog-to-Digital Converter (ADC)
      3. 2.2.3 External Factor: Probe Ground Termination
      4. 2.2.4 External Factor: Component Tolerances
    3. 2.3 Device Temperature on the Sense (SNS) Pin
  5. 3Fault State Diagnostics
    1. 3.1 Fault Behavior Configurations: Latch/THER/Delay Pin
      1. 3.1.1 Latch Pin
      2. 3.1.2 THER Pin
      3. 3.1.3 Delay Pin
    2. 3.2 Open Load Fault
    3. 3.3 Short to Battery Fault
    4. 3.4 Thermal Shutdown
    5. 3.5 Loss of Ground or Power Supply
    6. 3.6 Summary
  6. 4References

3.1.3 Delay Pin

The devices that have a DELAY pin can be configured three ways: pulled directly to GND, pulled to GND through a capacitor, or pulled high through an external pull up. This allows for three modes for devices that have the DELAY pin: Holding, Latch-Off, and Auto-Retry as shown in Table 3-2.

The Latch-Off and Auto-Retry operate in similar modes as the LATCH behavior. Latch-Off mode will latch off after a configured delay time by grounding the DELAY pin through a capacitor. Auto-Retry will periodically attempt to restart normal operation after some time. The Holding mode is configured by grounding the DELAY pin and sets the device to hold the current limit until the device hits thermal shutdown.

Table 3-2 shows these modes, their behavior, and how to recover from them.

Table 3-2 DELAY Pin Configuration, Current Limit Behavior and Fault Recovery
Mode Delay Configuration Output Current Behavior /Fault Recovery
Holding Connect to GND directly When hitting a current limit, the output current holds at the set current. The device enters into thermal shutdown mode when TJ > T(SD) /Fault clears when IN turns low for a duration longer than t/FAULT OR when the current limit is removed when IN is high
Latch-Off Connect to GND through a capacitor When hitting a current limit, the output current holds at the set current, but latches off after a preset DELAY time (tdl1 + tdl2) whereGUID-CDF8C273-5759-4BAD-8CCC-9267BB6B536C-low.png The output stays latched off regardless of whether the current limit is removed. The output recovers when IN is toggling. /Fault clears when IN turns low for a duration longer than t/FAULT
Auto-Retry External Pullup When hitting a current limit, the output current holds at the set current, but periodically comes on for thic(on) and turns off for t­hic(off). /Fault clears when IN turns low for a duration longer than t/FAULT OR when the current limit is removed for thic(on)