ZHCSO95B june   2022  – may 2023 TPS1641

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
  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 Timing Requirements
    7. 7.7 Typical Characteristics
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Enable and Shutdown Input (EN/SHDN)
      2. 8.3.2  Overvoltage Protection (OVP)
      3. 8.3.3  Output Slew Rate and Inrush Current Control (dVdt)
      4. 8.3.4  Active Current Limiting (ILIM) With the TPS16412, TPS16413, TPS16416, and TPS16417
      5. 8.3.5  Active Power Limiting (PLIM) With the TPS16410, TPS16411, TPS16414, and TPS16415
        1. 8.3.5.1 Internal Current Limit for the TPS16410 and TPS16411
      6. 8.3.6  Overcurrent Protection (IOCP) and Blanking Time (IDLY or PDLY) for Transient Loads
      7. 8.3.7  Fast-Trip and Short-Circuit Protection
      8. 8.3.8  Analog Load Current Monitor (IMON) on the IOCP Pin
      9. 8.3.9  IN to OUT Short Detection (TPS16410, TPS16411, TPS16412, and TPS16413)
      10. 8.3.10 Thermal Shutdown and Overtemperature Protection
      11. 8.3.11 Fault Response and Indication (FLT)
    4. 8.4 Device Functional Modes
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application: 15-W Power Limiting for Low Power Circuits (LPCs)
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Setting Overvoltage Setpoints
        2. 9.2.2.2 Setting the Output Overcurrent Setpoint (IOCP)
        3. 9.2.2.3 Setting the Output Power Limit
        4. 9.2.2.4 Monitoring the Output Current
        5. 9.2.2.5 Limiting the Inrush Current and Setting the Output Slew Rate
      3. 9.2.3 Application Curves
    3. 9.3 System Examples
      1. 9.3.1 Accurate Power or Current Limiting at the Output of DC/DC or Flyback Converter
    4. 9.4 Best Design Practices
    5. 9.5 Power Supply Recommendations
      1. 9.5.1 Transient Protection
    6. 9.6 Layout
      1. 9.6.1 Layout Guidelines
      2. 9.6.2 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. 11Mechanical, Packaging, and Orderable Information

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8.3.11 Fault Response and Indication (FLT)

FLT is an open-drain output to indicate the overvoltage, IN to OUT short, overtemperature, current limit, and power limit events. Table 8-4 summarizes the state of FLT pin under different events. To prevent excessive dissipation in device during adjacent pin short test (FLT to EN/SHDN), pull up the FLT pin with a resistor (RFLT) such that sink current into FLT pin is less than 3 mA. Figure 8-16 shows the connection diagram for FLT pin with a pullup resistor.

GUID-20211222-SS0I-T39B-VFFB-M9WMGDKCNBWR-low.svg Figure 8-16 FLT Output in the TPS1641x
Table 8-4 FLT Pin Indication for Different Events
Event, Condition FLT Pin Retry Delay With IDLY/PDLY = Open or GND for TPS16410, TPS16412, TPS16414, and TPS16416 Retry Delay With Capacitor on IDLY/PDLY pin for TPS16410, TPS16412, TPS16414, and TPS16416
Overvoltage protection (VOVP > VOVPR)(1) Low NA NA
IN to short detection (TPS16410, TPS16411, TPS16412, and TPS16413) Low No retry, latch off No retry, latch off
Thermal shutdown (TJ > TTSD) Low 620 ms 8 × tPDLY/IDLY
After current or power limiting timeout Low 620 ms 8 × tPDLY/IDLY
(1) For overvoltage protection, device turns on the FET as VOVP falls below VOVPF
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