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 Protection Provided by TPS2661 to Analog Input Module

TPS2661x provides Universal Input protection for ±20 mA, 0 to 20 mA, 4-20 mA. Figure 2-1 shows an analog input module with TPS2661x current loop protector. TPS2661x provides the over current, over voltage and surge protection needed for the Analog input modules. This device offers protection up to a voltage of +/- 50V, while supporting operation on lower power supplies because of a low Rds on of 7.5Ohm. All these protection benefits are offered while still being HART compliant. The low leakage currents from the current loop helps it to maintain the integrity of the data being transmitted in the form of an analog dc current while allowing the modulated ac current on top of it in the form of HART.

GUID-20201106-CA0I-QPXN-J60V-8H1MLLX6KF84-low.gif Figure 2-1 Protection for Analog Input with TPS2661x