SLVS857B December   2009  – January 2015 DRV8808

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 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 Setup Mode, Extended Setup Mode, Power-Down Mode
        1. 7.3.1.1 Operation Setup Register Bit Assignment
        2. 7.3.1.2 Operation Extended Setup Register Bit Assignment
        3. 7.3.1.3 Deep Sleep Mode
        4. 7.3.1.4 DC Motor Drive
        5. 7.3.1.5 Short/Open for Motor Outputs
        6. 7.3.1.6 Charge Pump
        7. 7.3.1.7 DC-DC Converters
        8. 7.3.1.8 nReset: Input for System Reset
        9. 7.3.1.9 VM Start-up/Power-Down and Glitch Condition
      2. 7.3.2 Blanking Time Insertion Timing for DC Motor Driving
      3. 7.3.3 Function Table in nORT, Power Down, VM Conditions
    4. 7.4 Device Functional Modes
      1. 7.4.1 Operation With 7 V < VM < 18 V
      2. 7.4.2 Operation With 18 V ≤ VM ≤ 38 V
    5. 7.5 Programming
      1. 7.5.1 Serial Interface
  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
        1. 8.2.2.1 Output Voltage for Each DC-DC Converter
        2. 8.2.2.2 Output Voltage Start Up Sequence
        3. 8.2.2.3 Other Parameters
        4. 8.2.2.4 Motor Configuration
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

8.1 Application Information

The DRV8808 provides an integrated motor driver solution. The chip has three H-bridges internally and is configurable to different settings by SPI communication.

8.2 Typical Application

fbd_slvs857.gifFigure 27. 3 DC Motors, 3 Switching Regulators and 1 LDO Usage Case

8.2.1 Design Requirements

To begin the design process, determine the following:

  • Output voltage for each DC-DC converter and LDO.
  • Output voltage start up sequence.
  • Other parameters through SPI.

8.2.2 Detailed Design Procedure

8.2.2.1 Output Voltage for Each DC-DC Converter

Output voltage is set by external feedback resister network. For example,

1.5-V Output : 1.0 KΩ and 2.0 KΩ

1.0-V Output : 0 Ω and 3.0 KΩ

3.3-V Output : 6.8 KΩ and 1.5 KΩ

8.2.2.2 Output Voltage Start Up Sequence

DC-DC converters start up sequence is determined by CSELECT pin. See DC-DC Converters for details.

8.2.2.3 Other Parameters

Other parameters are programmed through SPI.

8.2.2.4 Motor Configuration

Many parameters are set by SPI register setting. Ramp up device with nSLEEP = Low, then write setup registers through SPI.

8.2.3 Application Curves

C001_SLVS857.pngFigure 28. Tsense (Analog Out) Temperate Coefficient: Voltage Plot Example (Typical)
C002_SLVS857.pngFigure 29. DC-DC Converter - DC Load Regulation Example (Typical)