SLVSBN4C January   2013  – August 2016 DRV8839

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 Timing Requirements
    7. 6.7 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 Protection Circuits
        1. 7.3.1.1 Overcurrent Protection (OCP)
        2. 7.3.1.2 Thermal Shutdown (TSD)
        3. 7.3.1.3 Undervoltage Lockout (UVLO)
    4. 7.4 Device Functional Modes
      1. 7.4.1 Bridge Control
      2. 7.4.2 Sleep Mode
      3. 7.4.3 Motor Connections
  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 Motor Voltage
        2. 8.2.2.2 Low-Power Operation
        3. 8.2.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Bulk Capacitance
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
      1. 10.3.1 Power Dissipation
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 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 DRV8839 is used in one control applications.

8.2 Typical Application

The following design is a common application of the DRV8839.

DRV8839 typ_app_slvsbn4.gif Figure 9. Typical Application Schematic

8.2.1 Design Requirements

The design requirements are shown in Table 6.

Table 6. Design Requirements

DESIGN PARAMETER REFERENCE EXAMPLE VALUE
Motor voltage VM 5 V
Motor RMS current IRMS 0.3 A
Motor startup current ISTART 0.6 A

8.2.2 Detailed Design Procedure

The following design procedure can be used to configure the DRV8839 in a brushed motor application.

8.2.2.1 Motor Voltage

The appropriate motor voltage depends on the ratings of the motor selected and the desired RPM. A higher voltage spins a brushed DC motor faster with the same PWM duty cycle applied to the power FETs. A higher voltage also increases the rate of current change through the inductive motor windings.

8.2.2.2 Low-Power Operation

When entering sleep mode, TI recommends setting all inputs as a logic low to minimize system power.

8.2.2.3 Application Curves

The following scope captures show a typical motor startup and running. Channel 1 is VM, Channel 2 is IN1, Channel 3 is IN2, and Channel 4 is motor current. the motor used is a NMB Technologies, PPN7PA12C1.

DRV8839 drv8839_3p3vcc5vm_startup.gif Figure 10. Motor Startup With VCC = 3.3 V, VM = 5 V
DRV8839 drv8839_3pvcc_5vm_running.gif Figure 11. Motor Running With VCC = 3.3 V, VM = 5 V