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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7 Detailed Description

7.1 Overview

The DRV8839 is an integrated motor driver solution used for brushed motor control. The device integrates two independent ½ H-bridge, and can drive one motor in both directions or two motors in one direction. The output driver block for each ½ H-bridge consists of N-channel power MOSFETs. An internal charge pump generates the gate drive voltages. Protection features include overcurrent protection, short-circuit protection, undervoltage lockout, and overtemperature protection.

The DRV8839 allows separation of the motor voltage and logic voltage if desired. If VM and VCC are less than
7 V, the two voltages may be connected.

The control interface of the DRV8839 uses INx and ENx to control each ½ H-bridge separately.

7.2 Functional Block Diagram

DRV8839 fbd_lvsbn4.gif

7.3 Feature Description

7.3.1 Protection Circuits

The DRV8839 is fully protected against undervoltage, overcurrent, and overtemperature events.

7.3.1.1 Overcurrent Protection (OCP)

An analog current limit circuit on each FET limits the current through the FET by removing the gate drive. If this analog current limit persists for longer than the OCP time, all FETs in the H-bridge disables. After approximately 1 ms, the bridge will be re-enabled automatically.

Overcurrent conditions on both high-side and low-side devices; a short to ground, supply, or across the motor winding result in an overcurrent shutdown.

7.3.1.2 Thermal Shutdown (TSD)

If the die temperature exceeds safe limits, all FETs in the H-bridge disables. Operation automatically resumes once the die temperature has fallen to a safe level.

7.3.1.3 Undervoltage Lockout (UVLO)

If at any time the voltage on the VCC pin falls below the undervoltage lockout threshold voltage, all circuitry in the device disables and internal logic resets. Operation resumes when VCC rises above the UVLO threshold.

Table 1. Device Protection

FAULT CONDITION ERROR REPORT H-BRIDGE INTERNAL CIRCUITS RECOVERY
VCC undervoltage (UVLO) VCC < VUVLO None Disabled Disabled VCC > VUVLO
Overcurrent (OCP) IOUT > IOCP None Disabled Operating tOCR
Thermal shutdown (TSD) TJ > TTSD None Disabled Operating TJ < TTSD – THYS

7.4 Device Functional Modes

The DRV8839 is active when the nSLEEP pin is set to a logic high. When in sleep mode, the ½ H-bridge FETs are disabled (High-Z).

Table 2. Device Operating Modes

OPERATING MODE CONDITION H-BRIDGE INTERNAL CIRCUITS
Operating nSLEEP high Operating Operating
Sleep mode nSLEEP low Disabled Disabled
Fault encountered Any fault condition met Disabled See Table 1

7.4.1 Bridge Control

The DRV8839 is controlled using separate enable and input pins for each ½-H-bridge.

The following table shows the logic for the DRV8839:

Table 3. Bridge Control

ENx INx OUTx
0 X Z
1 0 L
1 1 H

7.4.2 Sleep Mode

If the nSLEEP pin reaches a logic-low state, the DRV8839 enters a low-power sleep mode. In this state all unnecessary internal circuitry powers down.

7.4.3 Motor Connections

If a single DC motor connects to the DRV8839, it is connected between the OUT1 and OUT2 pins as shown in Figure 7:

DRV8839 single_dc_connection_lvsbn4.gif Figure 7. Single DC Motor Connection

Motor operation is controlled as show in Table 4.

Table 4. Single DC Motor Operation

EN1 EN2 IN1 IN2 OUT1 OUT2 MOTOR OPERATION
0 X X X Z See (1) Off (coast)
X 0 X X See (2) Z Off (coast)
1 1 0 0 L L Brake
1 1 0 1 L H Reverse
1 1 1 0 H L Forward
1 1 1 1 H H Brake
(1) State depends on EN2 and IN2, but does not affect motor operation because OUT1 is tri-stated.
(2) State depends on EN1 and IN1, but does not affect motor operation because OUT2 is tri-stated.

Two DC motors can be connected to the DRV8839. In this mode, it is not possible to reverse the direction of the motors; they turn only in one direction. The connections are shown in Figure 8:

DRV8839 dual_dc_connection_lvsbn4.gif Figure 8. Dual DC Motor Connection

Motor operation is controlled shown in Table 5.

Table 5. Dual DC Motor Operation

ENx INx OUTx MOTOR OPERATION
0 X Z Off (coast)
1 0 L Brake
1 1 H Forward