SNOSDL1 December   2024 LMG3650R035

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  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 Switching Parameters
      1. 7.1.1 Turn-On Times
      2. 7.1.2 Turn-Off Times
      3. 7.1.3 Drain-Source Turn-On and Turn-off Slew Rate
      4. 7.1.4 Zero-Voltage Detection Times (LMG3656R035 only)
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
      1. 8.2.1 LMG3650R035 Functional Block Diagram
      2. 8.2.2 LMG3651R035 Functional Block Diagram
      3. 8.2.3 LMG3656R035 Functional Block Diagram
      4. 8.2.4 LMG3657R035 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Drive Strength Adjustment
      2. 8.3.2 VDD Supply
      3. 8.3.3 Overcurrent and Short-Circuit Protection
      4. 8.3.4 Overtemperature Protection
      5. 8.3.5 UVLO Protection
      6. 8.3.6 Fault Reporting
      7. 8.3.7 Auxiliary LDO (LMG3651R035 Only)
      8. 8.3.8 Zero-Voltage Detection (ZVD) (LMG3656R035 Only)
      9. 8.3.9 Zero-Current Detection (ZCD) (LMG3657R035 Only)
    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 Slew Rate Selection
        2. 9.2.2.2 Signal Level-Shifting
    3. 9.3 Power Supply Recommendations
      1. 9.3.1 Using an Isolated Power Supply
      2. 9.3.2 Using a Bootstrap Diode
        1. 9.3.2.1 Diode Selection
        2. 9.3.2.2 Managing the Bootstrap Voltage
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
  11. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Support Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Tape and Reel Information

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発注情報

9.3.2.2 Managing the Bootstrap Voltage

In a synchronous buck or other converter where the low-side switch occasionally operates in third-quadrant, the bootstrap supply charges through a path that includes the third-quadrant voltage drop of the low-side LMG365xR035 during the dead time as shown in Charging Path for Bootstrap Diode. This third-quadrant drop can be large, which can over-charge the bootstrap supply in certain conditions. The VDD supply of LMG365xR035 must be kept below 18V.

LMG3650R035 LMG3651R035 LMG3656R035 LMG3657R035 Charging Path for Bootstrap DiodeFigure 9-7 Charging Path for Bootstrap Diode

As shown in Suggested Bootstrap Regulation Circuit, the recommended bootstrap supply includes a bootstrap diode, a series resistor, and a 16V TVS or Zener diode in parallel with the VDD bypass capacitor to prevent damaging the high-side LMG365xR035. The series resistor limits the charging current at start-up and when the low-side device is operating in third-quadrant mode. This resistor must be selected to allow sufficient current to power the LMG365xR035 at the desired operating frequency. At 100kHz operation, TI recommends a value of approximately 2Ω. At higher frequencies, this resistor value must be reduced or the resistor omitted entirely to ensure sufficient supply current.

LMG3650R035 LMG3651R035 LMG3656R035 LMG3657R035 Suggested Bootstrap Regulation Circuit Figure 9-8 Suggested Bootstrap Regulation Circuit