ZHCST41 September   2023 LMG3624

ADVANCE INFORMATION  

  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 Switching Characteristics
  8. 7 Parameter Measurement Information
    1. 7.1 GaN Power FET Switching Parameters
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 GaN Power FET Switching Capability
      2. 8.3.2 Turn-On Slew-Rate Control
      3. 8.3.3 Current-Sense Emulation
      4. 8.3.4 Input Control Pins (EN, IN)
      5. 8.3.5 AUX Supply Pin
        1. 8.3.5.1 AUX Power-On Reset
        2. 8.3.5.2 AUX Under-Voltage Lockout (UVLO)
      6. 8.3.6 Overcurrent Protection
      7. 8.3.7 Overtemperature Protection
      8. 8.3.8 Fault Reporting
    4. 8.4 Device Functional Modes
  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 Turn-On Slew-Rate Design
        2. 9.2.2.2 Current-Sense Design
      3. 9.2.3 Application Curves
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
        1. 9.4.1.1 Solder-Joint Stress Relief
        2. 9.4.1.2 Signal-Ground Connection
        3. 9.4.1.3 CS Pin Signal
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 接收文档更新通知
    3. 10.3 支持资源
    4. 10.4 Trademarks
    5. 10.5 静电放电警告
    6. 10.6 术语表
  12. 11Mechanical, Packaging, and Orderable Information

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9.2.2.2 Current-Sense Design

The current sense resistor RCS1 is calculated as described in the Current-Sense Emulation section where a traditional current-sense resistor design calculation is first performed and then muliplied by the current-sense emulation inverse gain. The traditional current-sense resistor design calculation, denoted RCS(trad), is for when the current-sense resistor is in series with the power switch and is sensing the full power-switch current.

Equation 5. RCS1 = 1,036 * RCS(trad)

RCS2 may or may not exist depending on the quasi-resonant controller. If RCS2 is used, keep in mind the RCS2 design calculation may assume a traditional current-sense resistor with a very small value that has no impact on the RCS2 calculation. Be careful to ensure the RCS2 calculation accounts for the significant RCS1 value.