JAJSG06E April   2016  – October 2018 LMG3410R070 , LMG3411R070

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      ブロック概略図
      2.      100V/nsを超えるスイッチング性能
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 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
  8. 8 Parameter Measurement Information
    1. 8.1 Switching Parameters
      1. 8.1.1 Turn-on Delays
      2. 8.1.2 Turn-off Delays
      3. 8.1.3 Drain Slew Rate
      4. 8.1.4 Turn-on and Turn-off Energy
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Direct-Drive GaN Architecture
      2. 9.3.2 Internal Buck-Boost DC-DC Converter
      3. 9.3.3 Internal Auxiliary LDO
      4. 9.3.4 Fault Detection
        1. 9.3.4.1 Over-current Protection
        2. 9.3.4.2 Over-Temperature Protection and UVLO
      5. 9.3.5 Drive Strength Adjustment
    4. 9.4 Device Functional Modes
      1. 9.4.1 Low-Power Mode
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1 Slew Rate Selection
          1. 10.2.2.1.1 Startup and Slew Rate with Bootstrap High-Side Supply
        2. 10.2.2.2 Signal Level-Shifting
        3. 10.2.2.3 Buck-Boost Converter Design
      3. 10.2.3 Application Curves
    3. 10.3 Paralleling GaN Devices
    4. 10.4 Do's and Don'ts
  11. 11Power Supply Recommendations
    1. 11.1 Using an Isolated Power Supply
    2. 11.2 Using a Bootstrap Diode
      1. 11.2.1 Diode Selection
      2. 11.2.2 Managing the Bootstrap Voltage
      3. 11.2.3 Reliable Bootstrap Start-up
  12. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 Power Loop Inductance
      2. 12.1.2 Signal Ground Connection
      3. 12.1.3 Bypass Capacitors
      4. 12.1.4 Switch-Node Capacitance
      5. 12.1.5 Signal Integrity
      6. 12.1.6 High-Voltage Spacing
      7. 12.1.7 Thermal Recommendations
    2. 12.2 Layout Example
  13. 13デバイスおよびドキュメントのサポート
    1. 13.1 デバイス・サポート
      1. 13.1.1 デベロッパー・ネットワークの製品に関する免責事項
    2. 13.2 ドキュメントのサポート
      1. 13.2.1 関連資料
    3. 13.3 ドキュメントの更新通知を受け取る方法
    4. 13.4 コミュニティ・リソース
    5. 13.5 商標
    6. 13.6 静電気放電に関する注意事項
    7. 13.7 Glossary
  14. 14メカニカル、パッケージ、および注文情報

11.1 Using an Isolated Power Supply

Using an isolated power supply to power the high-side device has the advantage that it will work regardless of continued power-stage switching or duty cycle. It can also power the high-side device before power-stage switching begins, eliminating the power-loss concern of switching with an unpowered LMG341xR070 (see Startup and Slew Rate with Bootstrap High-Side Supply for details). Finally, a properly-selected isolated supply will contribute fewer parasitics to the switching power stage, increasing power-stage efficiency. However, the isolated power supply solution is larger and more expensive than the bootstrap solution.

The isolated supply can be constructed from an output of a flyback or FlyBuck™ converter, or using an isolated power module. When using an unregulated supply, ensure that the input to the LMG341xR070 does not exceed the maximum supply voltage. If necessary, a 18 V zener to clamp the VDD voltage supplied by the isolated power converter. Minimizing the inter-winding capacitance of the isolated power supply or transformer is necessary to reduce switching loss in hard-switched applications.