ZHCSQ96 July   2021 DRV8770

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings Comm
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Gate Drivers
        1. 7.3.1.1 Gate Drive Timings
          1. 7.3.1.1.1 Propagation Delay
          2. 7.3.1.1.2 Deadtime and Cross-Conduction Prevention
        2. 7.3.1.2 Mode (Inverting and non-inverting INLx)
      2. 7.3.2 Pin Diagrams
      3. 7.3.3 Gate Driver Protective Circuits
        1. 7.3.3.1 VBSTx Undervoltage Lockout (BSTUV)
        2. 7.3.3.2 GVDD Undervoltage Lockout (GVDDUV)
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Bulk Capacitance Sizing
  10. 10Layout
    1. 10.1 Layout Example
    2. 10.2 Layout Guidelines
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 支持资源
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 术语表
  12. 12Mechanical, Packaging, and Orderable Information

封装选项

请参考 PDF 数据表获取器件具体的封装图。

机械数据 (封装 | 引脚)
  • RGE|24
散热焊盘机械数据 (封装 | 引脚)
订购信息

9.1 Bulk Capacitance Sizing

Having appropriate local bulk capacitance is an important factor in motor drive system design. It is generally beneficial to have more bulk capacitance, while the disadvantages are increased cost and physical size. The amount of local capacitance depends on a variety of factors including:

  • The highest current required by the motor system
  • The power supply's type, capacitance, and ability to source current
  • The amount of parasitic inductance between the power supply and motor system
  • The acceptable supply voltage ripple
  • Type of motor (brushed DC, brushless DC, stepper)
  • The motor startup and braking methods

The inductance between the power supply and motor drive system will limit the rate current can change from the power supply. If the local bulk capacitance is too small, the system will respond to excessive current demands or dumps from the motor with a change in voltage. When adequate bulk capacitance is used, the motor voltage remains stable and high current can be quickly supplied.

The data sheet provides a recommended minimum value, but system level testing is required to determine the appropriate sized bulk capacitor.

GUID-4C228AC8-BA56-492A-B1A1-8A115B954933-low.gifFigure 9-1 Motor Drive Supply Parasitics Example