SLVAEE9A October   2019  – July 2021 TPS2065C , TPS2065D , TPS2069C , TPS2069D , TPS25221

 

  1.   Trademarks
  2. 1Introduction
  3. 2Root cause of False Fault Glitch
  4. 3Solution for the Fault Glitch
    1. 3.1 With RC Filter to Eliminate Fault Glitch as Start-Up
    2. 3.2 Validate the Influence of RC Filter to Normal Operation
  5. 4Summary
  6. 5Revision History

1 Power Switch Fault Glitch Solution During Power Up

The Fault open-drain output of power switch is usually connected to MCU as an indicator when an over-current or over temperature condition is encountered. However, in some cases, as input of power switch powers up fast, momentary false fault asserts that may lead to the MCU operating incorrectly.

It is suggested to use the software method such as controlling the MCU to avoid the fault glitch. This application report also displays one work around to avoid this false fault signal transferring to MCU. The document is applicable for TPS25221, TPS2065C/D, and TPS2069C/D.