SLVSFQ6A November   2020  – June 2021 TPS2640

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison
  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 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Undervoltage Lockout (UVLO)
      2. 9.3.2 Overvoltage Protection (OVP)
      3. 9.3.3 Reverse Input Supply Protection
      4. 9.3.4 Hot Plug-In and In-Rush Current Control
      5. 9.3.5 Overload and Short Circuit Protection
        1. 9.3.5.1 Overload Protection
          1. 9.3.5.1.1 Active Current Limiting
          2. 9.3.5.1.2 Electronic Circuit Breaker with Overload Timeout, MODE = OPEN
        2. 9.3.5.2 Short Circuit Protection
          1. 9.3.5.2.1 Start-Up With Short-Circuit On Output
        3. 9.3.5.3 FAULT Response
          1. 9.3.5.3.1 Look Ahead Overload Current Fault Indicator
        4. 9.3.5.4 Current Monitoring
        5. 9.3.5.5 IN, OUT, RTN, and GND Pins
        6. 9.3.5.6 Thermal Shutdown
        7. 9.3.5.7 Low Current Shutdown Control (SHDN)
    4. 9.4 Device Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Step by Step Design Procedure
        2. 10.2.2.2 Undervoltage Lockout and Overvoltage Set Point
        3. 10.2.2.3 Programming Current Monitoring Resistor—RIMON
        4. 10.2.2.4 Setting Output Voltage Ramp Time—(tdVdT)
          1. 10.2.2.4.1 Case 1: Start-Up Without Load—Only Output Capacitance C(OUT) Draws Current During Start-Up
          2. 10.2.2.4.2 Case 2: Start-Up With Load—Output Capacitance C(OUT) and Load Draws Current During Start-Up
          3. 10.2.2.4.3 Support Component Selections—RFLTb and C(IN)
      3. 10.2.3 Application Curves
    3. 10.3 System Examples
      1. 10.3.1 Acive ORing Operation
      2. 10.3.2 Field Supply Protection in PLC, DCS I/O Modules
      3. 10.3.3 Simple 24-V Power Supply Path Protection
    4. 10.4 Do's and Dont's
  11. 11Power Supply Recommendations
    1. 11.1 Transient Protection
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
    3. 13.3 Receiving Notification of Documentation Updates
    4. 13.4 Support Resources
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

9.4 Device Functional Modes

Different operational modes of the device are explained in Table 9-2.

Table 9-2 Device Operational Differences Under Different MODE Configurations
MODEPIN CONFIGURATION

MODE CONNECTED TO RTN (CURRENT LIMIT WITH AUTO-RETRY)

A 402-kΩ RESISTOR CONNECTED BETWEEN MODE AND RTN PINS (CURRENT LIMIT WITH LATCHOFF)

MODE PIN = OPEN (CIRCUIT BREAKER WITH AUTO-RETRY)
Start-up Inrush current controlled by dVdT
Inrush limited to I(OL) level as set by R(ILIM) Inrush limited to I(OL) level as set by R(ILIM) Inrush limited to I(OL) level as set by R(ILIM)
Fault timer runs when current is limited to I(OL)
Fault timer expires after tCB(dly) causing the FETs to turnoff
If TJ > T(TSD), device turns off
Overcurrent response Current is limited to I(OL) level as set by R(ILIM) Current is limited to I(OL) level as set by R(ILIM) Current is allowed through the device if I(LOAD) < I(FASTTRIP)
Power dissipation increases as V(IN) – V(OUT) increases Power dissipation increases as V(IN) – V(OUT) increases Fault timer runs when the current increases above I(OL)
Fault timer expires after tCB(dly) causing the FETs to turnoff
Device turns off when TJ > T(TSD) Device turns off when TJ > T(TSD) Device turns off if TJ > T(TSD) before timer expires
Device attempts restart 540 ms after TJ < [T(TSD) – 10°C] Device remains off TPS26400 device attempts to restart 540 ms after TJ < [T(TSD) – 10°C]
Short-circuit response Fast turnoff when I(LOAD) > I(FASTRIP)
Quick restart and current limited to I(OL), follows standard start-up