SLRS065E September   2013  – November 2015 DRV8860

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Handling Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Recommended Output Current
      2. 8.3.2 Daisy Chain Connection
      3. 8.3.3 Protection Circuits
        1. 8.3.3.1 Overcurrent Protection (OCP)
        2. 8.3.3.2 Open Load Detection (OL) - DRV8860 only
        3. 8.3.3.3 Thermal Shutdown (TSD)
        4. 8.3.3.4 Undervoltage Lockout (UVLO)
        5. 8.3.3.5 Digital Noise Filter
    4. 8.4 Device Functional Modes
      1. 8.4.1 Internal Registers
    5. 8.5 Programming
      1. 8.5.1 Serial Control Interface
        1. 8.5.1.1 Data Writing Waveform
        2. 8.5.1.2 Fault Register Reading Waveform
        3. 8.5.1.3 Special Command
          1. 8.5.1.3.1 Special command: Write Control Register
          2. 8.5.1.3.2 Special command: Read Control Register
          3. 8.5.1.3.3 Special command: Read Data Register
          4. 8.5.1.3.4 Special command: Fault Register Reset
          5. 8.5.1.3.5 Special command: PWM Start
        4. 8.5.1.4 Output Energizing and PWM Control
          1. 8.5.1.4.1 PWM Start Special Command Used
    6. 8.6 Register Maps
      1. 8.6.1 Data Register
      2. 8.6.2 Fault Register
      3. 8.6.3 Control Register
  9. 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 Drive Current
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Power Supply and Logic Sequencing
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Thermal Consideration
      1. 11.3.1 Power Dissipation
      2. 11.3.2 Heatsinking
  12. 12Device and Documentation Support
    1. 12.1 Community Resources
    2. 12.2 Trademarks
    3. 12.3 Electrostatic Discharge Caution
    4. 12.4 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

10 Power Supply Recommendations

The DRV8860 is designed to operate from an input voltage supply (VM) range between 8 and 38 V. A 0.1-µF ceramic capacitor rated for VM must be placed as close as possible to the VM pin. In addition to the local decoupling cap, additional bulk capacitance is required and must be sized accordingly to the application requirements.

Bulk capacitance sizing is an important factor in motor drive system design. It is dependent on a variety of factors including:

  • Type of power supply
  • Acceptable supply voltage ripple
  • Parasitic inductance in the power supply wiring
  • Type of load
  • Load startup current

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. The user should size the bulk capacitance to meet acceptable voltage ripple levels.

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

DRV8860 DRV8860A Power_supply_example_slrs065.gif Figure 38. Example Setup of Motor Drive System with External Power Supply

10.1 Power Supply and Logic Sequencing

There is no specific sequence for powering-up the DRV8860. It is okay for digital input signals to be present before VM is applied. After VM is applied to the DRV8860, it begins operation based on the status of the control pins.