SLVAF72 September   2021 TPS2661

 

  1.   Trademarks
  2. 1Overview of a HART Enabled Analog Input Module
  3. 2Protection Provided by TPS2661 to Analog Input Module
    1. 2.1 Overload Protection
    2. 2.2 Output Hot Short and Input Hot Plug
    3. 2.3 Miswiring on Input
    4. 2.4 Input Under Voltage Protection
  4. 3Protection Provided by TPS2661 to Analog Output Module (AOM)
    1. 3.1 Miswiring on Output
    2. 3.2 Output under voltage protection
  5. 4HART Tests Done on TPS2661x
  6. 5Challenges Using Discrete Solution Instead of TPS2661x

2.1 Overload Protection

The TPS2661x devices feature a fixed bidirectional over current threshold of 32-mA (IOL) typical. It can also allow 2 times the IOL for limited time depending on the mode of operation. If the current tries to exceed the IOL limit, the device regulates the current and eventually reduce the output voltage. The power dissipation across the device during current regulation will be (VIN - VOUT) x IOUT and this could heat up the device and lead to thermal shutdown. The device does auto retry to power up post that and eventually power up if the overload condition passes.