SLVSFE3C November   2020  – December 2021 TPS2661

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Overload Protection and Fast-Trip
      2. 8.3.2 Reverse Current Blocking for Unipolar Current Inputs TPS26610, TPS26611 and TPS26612 (4–20 mA, 0–20 mA)
      3. 8.3.3 OUTPUT and INPUT Cutoff During Overvoltage, Undervoltage Due to Miswiring
        1. 8.3.3.1 Output Overvoltage With TPS2661x Devices
        2. 8.3.3.2 Output or Input Undervoltage With TPS26610, TPS26611 and TPS26612
        3. 8.3.3.3 Output Undervoltage With TPS26613 and TPS26614
      4. 8.3.4 External Power Supply (±Vs)
      5. 8.3.5 Loop Testing Without ±Vs Supply (Loop Power Mode in TPS26610, TPS26613 Only)
        1. 8.3.5.1 Supply Sensing With VSNS for Loop Power Mode With TPS26610 and TPS26613
      6. 8.3.6 Enable Control With TPS26611, TPS26612, and TPS26614
      7. 8.3.7 Signal Good Indicator (SGOOD)
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application: Analog Input Protection for Current Inputs with TPS26610
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure for Current Inputs with TPS26610
        1. 9.2.2.1 Selecting ±Vs Supplies for TPS26610
        2. 9.2.2.2 Selecting RBurden
        3. 9.2.2.3 Selecting MODE Configuration for TPS26610
      3. 9.2.3 Application Performance Plots for Current Inputs with TPS26610
    3. 9.3 Typical Application: Analog Input Protection for Multiplexed Current and Voltage Inputs with TPS26611
      1. 9.3.1 Design Requirements
      2. 9.3.2 Detailed Design Procedure for Analog Input Protection for Multiplexed Current and Voltage Inputs with TPS26611
        1. 9.3.2.1 Selecting ±Vs Supplies for TPS26611
        2. 9.3.2.2 Selecting MODE Configuration for TPS26611
        3. 9.3.2.3 Selecting Bias Resistors R1, R2 for Setting Common Mode Voltage for Voltage Inputs
      3. 9.3.3 Application Performance Plots for V/I Inputs with TPS26611
    4. 9.4 System Examples
      1. 9.4.1 Power Supply Protection of 2-Wire Transmitter with TPS26612
      2. 9.4.2 Protection of 3-Wire Transmitters and Analog Output Modules With TPS26611, TPS26612
      3. 9.4.3 UART IO Protection With TPS26611, TPS26612
      4. 9.4.4 Higher Loop Impedance With TPS26613 and TPS26614
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Support Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

9.4.1 Power Supply Protection of 2-Wire Transmitter with TPS26612

GUID-20210222-CA0I-RDPD-W0LJ-FP39Q2BTCC53-low.gif Figure 9-11 Power Supply Protection for 2-Wire Transmitter with TPS26612

TPS26612 can be used for protection of power supply powering a two wire field transmitter as shown in Figure 9-11. Connect an external signal diode (D1) from IN to +Vs pin of TPS26612 in case of external field supply to protect the system from miswiring. In case the supply is internal to the module and miswiring is not a possibility, the signal diode (D1) is not needed. TPS26612 device includes higher threshold for overvoltage protection on OUT to accommodate the voltage drop of diode (D1) between IN and +Vs.

TPS26612 has over-load expiry time (tOL_expiry) disabled for the first overload fault after power-up up to a duration of tAR_dis (5 sec). With overload expiry time disabled, TPS26612 is able to power up 2-wire transmitters requiring higher start-up for longer durations (up to 5 sec.). The current limit threshold (IOL or 2 x IOL) for startup can be selected by MODE pin.

GUID-20210223-CA0I-KV6V-SRCZ-NKQXFMRS11J9-low.png
VIN = 24 V, COUT = 1 mF
Figure 9-12 TPS26612: Startup of 2-Wire transmitter with MODE = GND, IOUT = 30 mA
GUID-20210223-CA0I-LMKX-8N15-4BRDKMLRC0VQ-low.png
VIN = 24 V, COUT = 1 mF
Figure 9-13 TPS26612: Startup of 2-Wire transmitter with MODE = Open, IOUT = 60 mA

During the first overload fault, if the junction temperature reaches TSD, the device turns off the internal FETs and turns on as the junction temperature goes below [TTSD – TTSDHyst].