ZHCSG04F january   2017  – may 2023 TPS65235-1

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Pin Configuration and Functions
  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 Timing Requirements
    7. 6.7 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Boost Converter
      2. 7.3.2  Linear Regulator and Current Limit
      3. 7.3.3  Boost Converter Current Limit
      4. 7.3.4  Charge Pump
      5. 7.3.5  Slew Rate Control
      6. 7.3.6  Short-Circuit Protection, Hiccup, and Overtemperature Protection
      7. 7.3.7  Tone Generation
      8. 7.3.8  Tone Detection
      9. 7.3.9  Audio Noise Rejection
      10. 7.3.10 Disable and Enable
      11. 7.3.11 Component Selection
        1. 7.3.11.1 Boost Inductor
        2. 7.3.11.2 Capacitor Selection
        3. 7.3.11.3 Surge Components
        4. 7.3.11.4 Consideration for Boost Filtering and LNB Noise
    4. 7.4 Device Functional Modes
    5. 7.5 Programming
      1. 7.5.1 Serial Interface Description
      2. 7.5.2 TPS65235-1 I2C Update Sequence
    6. 7.6 Register Maps
      1. 7.6.1 Control Register 1 (address = 0x00) [reset = 0x08]
      2. 7.6.2 Control Register 2 (address = 0x01) [reset = 0x09]
      3. 7.6.3 Status Register (address = 0x02) [reset = 0x29]
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 DiSEqc1.x Support
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 DiSEqc2.x Support
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curve
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 第三方产品免责声明
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 接收文档更新通知
    4. 9.4 支持资源
    5. 9.5 Trademarks
    6. 9.6 静电放电警告
    7. 9.7 术语表
  11. 10Mechanical, Packaging, and Orderable Information

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7.3.2 Linear Regulator and Current Limit

The linear regulator is used to generate the 22-kHz tone signal by changing the LDO reference voltage. The linear regulator features low-dropout voltage to minimize power loss while maintaining enough head room for the 22-kHz tone with 650-mV amplitude. The linear regulator also implements a tight current limit for overcurrent protection. The current limit is set by an external resistor connected to ISET pin. Figure 7-1 shows the relationship between the current limit threshold and the resistor value.

GUID-79D3FE33-E99D-42E8-85C2-A2DCD4D4208D-low.gifFigure 7-1 Linear Regulator Current Limit Vs Resistor
Equation 1. R S E T   k Ω   = 117.08   ×   I S E T - 1.267   A

A 200-kΩ resistor sets the current to 0.65 A, and 110-kΩ resistor sets the current to approximately 1 A.