SLVSB17D March   2012  – April 2016 DRV8836

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 Sleep Mode
      2. 7.3.2 Power Supplies and Input Pins
      3. 7.3.3 Protection Circuits
        1. 7.3.3.1 Overcurrent Protection (OCP)
        2. 7.3.3.2 Thermal Shutdown (TSD)
        3. 7.3.3.3 Undervoltage Lockout (UVLO)
    4. 7.4 Device Functional Modes
      1. 7.4.1 Bridge Control
  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. 8.2.3 Application Curve
  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
      2. 10.3.2 Heatsinking
  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

8 Application and Implementation

NOTE

The 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 DRV8836 is used in one or two motor control applications. When configured in parallel, the DRV8836 provides double the current to one motor.

8.2 Typical Application

The two H-bridges in the DRV8836 can be connected in parallel for double the current of a single H-bridge. Figure 5 shows the connections.

The following design is a common application of the DRV8836.

DRV8836 parallel_lvsb17.gif Figure 5. Parallel Mode Connections

8.2.1 Design Requirements

The design requirements are shown in Table 5.

Table 5. Design Requirements

DESIGN PARAMETER REFERENCE EXAMPLE VALUE
Motor voltage VCC 4 V
Motor RMS current IRMS 0.3 A
Motor startup current ISTART 0.6 A
Motor current trip point ILIMIT 0.5 A

8.2.2 Detailed Design Procedure

The following design procedure can be used to configure the DRV8836 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.

8.2.3 Application Curve

The following scope captures motor startup as VCC ramps from 0 V to 6 V. Channel 1 is VCC, and Channel 4 is the motor current of an unloaded motor during startup. The motor used is a NMB Technologies Corporation OOB7PA12C, PPN7PA12C1. As VCC ramps the current in the motor increases until the motor speed builds up. The motor current then reduces for normal operation.

Inputs are set as follows:

  • Mode: IN/IN
  • AIN1: High
  • AIN2: Low
DRV8836 DRV8836_6Vcc_6VM.png Figure 6. Motor Startup With No Load