SLOS842A September   2013  – June 2015 DRV8301-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 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  Buck Converter Characteristics
    7. 6.7  Current Shunt Amplifier Characteristics
    8. 6.8  Gate Timing and Protection Characteristics
    9. 6.9  SPI Timing Requirements (Slave Mode Only)
    10. 6.10 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Function Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Three-Phase Gate Driver
      2. 7.3.2 Current Shunt Amplifiers
      3. 7.3.3 Buck Converter
      4. 7.3.4 Protection Features
        1. 7.3.4.1 Overcurrent Protection and Reporting (OCP)
        2. 7.3.4.2 Undervoltage Protection (PVDD_UV and GVDD_UV)
        3. 7.3.4.3 Overvoltage Protection (GVDD_OV)
        4. 7.3.4.4 Overtemperature Protection
        5. 7.3.4.5 Fault and Protection Handling
      5. 7.3.5 Start-up and Shutdown Sequence Control
    4. 7.4 Device Functional Modes
      1. 7.4.1 EN_GATE
      2. 7.4.2 DTC
      3. 7.4.3 VDD_SPI
    5. 7.5 Programming
      1. 7.5.1 SPI Communication
        1. 7.5.1.1 SPI
        2. 7.5.1.2 SPI Format
    6. 7.6 Register Maps
      1. 7.6.1 Read / Write Bit
      2. 7.6.2 Address Bits
      3. 7.6.3 SPI Data Bits
        1. 7.6.3.1 Status Registers
        2. 7.6.3.2 Control Registers
        3. 7.6.3.3 Overcurrent Adjustment
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Gate Driver Start-up Issue Errata
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Gate Drive Average Current Load
        2. 8.2.2.2 Overcurrent Protection Setup
        3. 8.2.2.3 Sense Amplifier Setup
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Bulk Capacitance
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

9 Power Supply Recommendations

9.1 Bulk Capacitance

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 needed depends on a variety of factors, including:

  • The highest current required by the motor system
  • The capacitance of the power supply and its ability to source or sink current
  • The amount of parasitic inductance between the power supply and motor system
  • The acceptable voltage ripple
  • The type of motor used (brushed DC, brushless DC, stepper)
  • The motor braking method

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 generally provides a recommended value, but system-level testing is required to determine the appropriate sized bulk capacitor.

DRV8301-Q1 example_setup_slos719.gifFigure 12. Example Setup of Motor Drive System With External Power Supply

The voltage rating for bulk capacitors should be greater than the operating voltage, to provide margin for cases when the motor transfers energy to the supply.