ZHCSMM1C April   2023  – February 2024 TPS274C65

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
    1.     7
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 SPI Timing Requirements
    8. 6.8 Typical Characteristics
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Pin Diagrams
      2. 8.3.2 SPI Mode Operation
        1. 8.3.2.1 Diagnostic Bit Behavior
      3. 8.3.3 Programmable Current Limit
        1. 8.3.3.1 Inrush Current Handling
      4. 8.3.4 DO_EN Feature
      5. 8.3.5 Protection Mechanisms
        1. 8.3.5.1 Overcurrent Protection
        2. 8.3.5.2 Short Circuit Protection
          1. 8.3.5.2.1 VS During Short-to-Ground
        3. 8.3.5.3 Inductive-Load Switching-Off Clamp
        4. 8.3.5.4 Inductive Load Demagnetization
        5. 8.3.5.5 Thermal Shutdown
        6. 8.3.5.6 Undervoltage protection on VS
        7. 8.3.5.7 Undervoltage Lockout on Low Voltage Supply (VDD_UVLO)
        8. 8.3.5.8 Power-Up and Power-Down Behavior
        9. 8.3.5.9 Reverse Current Blocking
      6. 8.3.6 Diagnostic Mechanisms
        1. 8.3.6.1 Current Sense
          1. 8.3.6.1.1 RSNS Value
            1. 8.3.6.1.1.1 SNS Output Filter
        2. 8.3.6.2 Fault Indication
          1. 8.3.6.2.1 Current Limit Behavior
        3. 8.3.6.3 Short-to-Battery and Open-Load Detection
        4. 8.3.6.4 On-State Wire-Break Detection
        5. 8.3.6.5 Off State Wire-Break Detection
        6. 8.3.6.6 ADC
      7. 8.3.7 LED Driver
    4. 8.4 Device Functional Modes
      1. 8.4.1 OFF/POR
      2. 8.4.2 INIT
      3. 8.4.3 Active
    5. 8.5 TPS274C65BS Available Registers List
    6. 8.6 TPS274C65 Registers
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 IEC 61000-4-5 Surge
        2. 9.2.2.2 Loss of GND
        3. 9.2.2.3 Paralleling Channels
      3. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 接收文档更新通知
    2. 10.2 支持资源
    3. 10.3 Trademarks
    4. 10.4 静电放电警告
    5. 10.5 术语表
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

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8.3.6.4 On-State Wire-Break Detection

When the switch is enabled, TPS274C65 supports on-state open load detecttion as low as 0.32mA. In order to achieve this accuracy, TPS274C65 uses a higher resistance path that is enabled for a short period of time(TWB_ON1). If the WB_ON is kept high, the higher resistance path will be turned on again after 100ms retry time. The wire-break will also be retried whenever the WB_ON signal is toggled. Please refer to Figure 8-35 for the wire-break detection timing diagram. This functionality is enabled when EN_WB_ON and diagnostics are enabled, during this time open-load threshold will be detected and signaled through WB_ON_FLT bit if wire break is detected.

Table 8-9 Open-Load ON-State Detection Threshold
WB_ON_THD[2] WB_ON_THD[1] WB_ON_THD[0] Typical Current Threshold (mA)
0 0 0 0.32
0 0 1 0.64
0 1 0 0.96
0 1 1 1.28
1 0 0 1.6
1 0 1 1.92
1 1 0 2.24
1 1 1 2.56
GUID-20231017-SS0I-4LXB-H66P-S7NWQP5ZSJ6N-low.svg Figure 8-35 ON-State Wire-Break Detection
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