SLVAF40 July   2021 TPS2661

 

  1.   Trademarks
  2. 1Introduction
  3. 2Discrete Solution With PTC
  4. 3TPS26610 Advantages to a Typical Solution
    1. 3.1 BOM and Size Reduction
    2. 3.2 Burden Resistor and Power Dissipation
    3. 3.3 Voltage Drop
    4. 3.4 Signal Good
    5. 3.5 Additional TPS26610 Features
      1. 3.5.1 Miswiring
      2. 3.5.2 Surge
      3. 3.5.3 Current-Loop Test During Installation (Unpowered)
      4. 3.5.4 High Accuracy For Current Measurements
  5. 4Conclusion

4 Conclusion

Considering the schematics in Figure 2-1 and Figure 3-1, the pros of the current-loop protector TPS26610 over the discrete solution with the PTC are summarized in Table 4-1.

Table 4-1 Comparison of Current-Loop Protector TPS26610 Over the Discrete Solution With the PTC
TPS26610 Discrete Solution With PTC
Number of components 3 8
Solution size Reduced up to 85% 100%
Burden resistor properties Lower size and value Power dissipation constraints (higher size and value)
Signal Good Yes No
Voltage drop at the terminals Burden resistor + 200 mV (TPS26610) Burden resistor + PTC + protection resistors
Surge protection Yes Yes
Miswiring protection Yes Yes
Protection in powered and unpowered module Yes Yes

In conclusion, the TPS26610 is the integrated solution to both meet the technical specifications required in a current loop protector for AIN and the increasingly-restrictive space conditions.