ZHCSM06C december   2020  – may 2023 TPS272C45

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Device Comparison Table
  7. 6 Pin Configuration and Functions
    1. 6.1 Recommended Connections for Unused Pins
  8. 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 SNS Timing Characteristics
    7. 7.7 Switching Characteristics
    8. 7.8 Typical Characteristics
  9. 8 Parameter Measurement Information
  10. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Programmable Current Limit
        1. 9.3.1.1 Inrush Current Handling
        2. 9.3.1.2 Calculating RILIMx
        3. 9.3.1.3 Configuring ILIMx From an MCU
      2. 9.3.2 Low Power Dissipation
      3. 9.3.3 Protection Mechanisms
        1. 9.3.3.1 Short-Circuit Protection
          1. 9.3.3.1.1 VS During Short-to-Ground
        2. 9.3.3.2 Inductive Load Demagnetization
        3. 9.3.3.3 Thermal Shutdown
        4. 9.3.3.4 Undervoltage Lockout on VS (UVLO)
        5. 9.3.3.5 Undervoltage Lockout on Low Voltage Supply (VDD_UVLO)
        6. 9.3.3.6 Power-Up and Power-Down Behavior
        7. 9.3.3.7 Overvoltage Protection (OVPR)
      4. 9.3.4 Diagnostic Mechanisms
        1. 9.3.4.1 Current Sense
          1. 9.3.4.1.1 RSNS Value
            1. 9.3.4.1.1.1 Current Sense Output Filter
        2. 9.3.4.2 Fault Indication
          1. 9.3.4.2.1 Fault Event Diagrams
        3. 9.3.4.3 Short-to-Supply or Open-Load Detection
          1. 9.3.4.3.1 Detection With Switch Enabled
          2. 9.3.4.3.2 Detection With Switch Disabled
        4. 9.3.4.4 Current Sense Resistor Sharing
    4. 9.4 Device Functional Modes
      1. 9.4.1 Off
      2. 9.4.2 Diagnostic
      3. 9.4.3 Active
      4. 9.4.4 Fault
  11. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 IEC 61000-4-5 Surge
      2. 10.1.2 Inverse Current
      3. 10.1.3 Loss of GND
      4. 10.1.4 Paralleling Channels
      5. 10.1.5 Thermal Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 RILIM Calculation
        2. 10.2.2.2 Diagnostics
          1. 10.2.2.2.1 Selecting the RISNS Value
      3. 10.2.3 Application Curves
    3. 10.3 Power Supply Recommendations
    4. 10.4 Layout
      1. 10.4.1 Layout Guidelines
      2. 10.4.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 接收文档更新通知
    3. 11.3 支持资源
    4. 11.4 Trademarks
    5. 11.5 静电放电警告
    6. 11.6 术语表
  13. 12Mechanical, Packaging, and Orderable Information

6.1 Recommended Connections for Unused Pins

The TPS272C45 is designed to provide an enhanced set of diagnostic and protection features. However, if the system design only allows for a limited number of I/O connections, some pins can be considered as optional.

Table 6-2 Connections for Optional Pins
PIN NAMECONNECTION IF NOT USEDIMPACT IF NOT USED
SNSGround through 1-kΩ resistorAnalog current sense is not available.
LATCHGND pin of ICWith LATCH unused (pin grounded), the device auto-retries after a fault. If latched behavior is desired, but the system describes limited I/O, it is possible to use one microcontroller output to control the latch function of several high-side channels.
ILIMDGND pin of ICIf ILIMD pin is connected to IC_GND, the current limit threshold is at a constant value determined by the ILIM1/ILIM2 resistor values (delay time of zero).
ILIM1/ILIM2GND pin of ICIf either ILIMx pin is left floating or connected to IC_GND, the device is set to the default internal current-limit threshold.
FLT / FLTxGND pin of ICIf the FLT pin is unused, the system cannot read faults from the output.
SELGND pin of ICWith SEL unused, only channel one current sensing or Fault reporting is available from the SNS pin.
DIA_ENGND pin of ICWith DIA_EN unused, the analog current sense, open-load and short-to-supply diagnostics are not available.
VDDGND pin of ICVersion A: Connect to a 3.3-V or 5-V supply
Version C, D: With VDD unused, all supply current is drawn from the primary supply VS.
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