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

3 Protection Provided by TPS2661 to Analog Output Module (AOM)

Programmable logic controller (PLC) applications require a full function, flexible, programmable analog output solution. Figure 3-1 shows an analog output module. It hosts a DAC which converts the digital data and control instructions from the PLC MCU to analog data for the downstream actuators or indicators. Most of the AOM’s will be HART compatible to communicate with the on-field sensors used for system diagnostics. A HART enabled analog output module consists of a HART modem which will demodulate the ac coupled HART signals.

TPS2661x can be used for protection of analog output module against any high voltage field miswiring. The out-pin voltage is monitored with respect to the +Vs/-Vs supply voltages. If the OUT voltage goes outside the +Vs/-Vs supply rails, the FETs cutoff current conduction path and protects the whole system.

GUID-20210222-CA0I-1BVB-BMKN-CWMN3TQJBD38-low.gif Figure 3-1 Analog Output Protection with TPS2661x