ZHCSMA7C january   2022  – december 2022 TPS4811-Q1

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 Switching Characteristics
    7. 7.7 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  Charge Pump and Gate Driver output (VS, PU, PD, BST, SRC)
      2. 9.3.2  Capacitive Load Driving
        1. 9.3.2.1 FET Gate Slew Rate Control
        2. 9.3.2.2 Using Precharge FET - (with TPS48111-Q1 Only)
      3. 9.3.3  Overcurrent and Short-Circuit Protection
        1. 9.3.3.1 Overcurrent Protection With Auto-Retry
        2. 9.3.3.2 Overcurrent Protection With Latch-Off
      4. 9.3.4  Short-Circuit Protection
      5. 9.3.5  Analog Current Monitor Output (IMON)
      6. 9.3.6  Overvoltage (OV) and Undervoltage Protection (UVLO)
      7. 9.3.7  Device Functional Mode (Shutdown Mode)
      8. 9.3.8  Remote Temperature sensing and Protection (DIODE)
      9. 9.3.9  Output Reverse Polarity Protection
      10. 9.3.10 TPS4811x-Q1 as a Simple Gate Driver
  11. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application: Driving HVAC PTC Heater Load on KL40 Line in Power Distribution Unit
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Application Curves
    3. 10.3 Typical Application: Driving B2B FETs With Pre-charging the Output Capacitance
      1. 10.3.1 Design Requirements
      2. 10.3.2 External Component Selection
      3. 10.3.3 Application Curves
    4. 10.4 Power Supply Recommendations
    5. 10.5 Layout
      1. 10.5.1 Layout Guidelines
      2. 10.5.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 接收文档更新通知
    2. 11.2 支持资源
    3. 11.3 Trademarks
    4. 11.4 静电放电警告
    5. 11.5 术语表
  13. 12Mechanical, Packaging, and Orderable Information

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9.3.3 Overcurrent and Short-Circuit Protection

TPS4811x-Q1 has two-level current protection.

  • Adjustable overcurrent protection (IOC) threshold and response time (tOC),

  • Adjustable short-circuit threshold (ISC) with internally fixed fast response (tSC).

Figure 9-9 shows the I-T characteristics.

GUID-20221220-SS0I-KDWR-VVCV-V9LR9VV1FZ78-low.svg Figure 9-9 Overcurrent and Short-Circuit Protection Characteristics.

The device senses the voltage across the external current sense resistor through CS+ and CS–. Set the circuit breaker detection threshold using an external resistor RIWRN across IWRN and GND. Use Equation 6 to calculate the required RIWRN value.

Equation 6. GUID-20220922-SS0I-J2D5-KNRW-DJDDDBHT05L5-low.svg

Where, RSET is the resistor connected across CS+ and VS, RSNS is the current sense resistor, IOC is the overcurrent level

Note:

For short-circuit protection feature only, connect IWRN pin to GND and select RISCP resistor as per Section 9.3.4.

For overcurrent protection feature only, connect ISCP pin to CS– pin directly and select RIWRN resistor as per Equation 6.

In case of overcurrent or short-circuit event, TPS48111-Q1 controller turns off main FET by pulling PD low but state of pre-charge FET drive (G) is not changed.