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

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7 Detailed Description

7.1 Overview

The DRV8836 is an integrated motor driver solution used for brushed motor control. The device integrates two
H-bridges, and can drive two DC motor or one stepper motor. The output driver block for each 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 bridges connect in parallel for additional current capability.

The mode pin allows selection of either a PHASE/ENABLE or IN/IN interface.

7.2 Functional Block Diagram

DRV8836 fbd_lvsb17.gif

7.3 Feature Description

7.3.1 Sleep Mode

If the nSLEEP pin enters a logic-low state, the DRV8836 enters a low-power sleep mode. In this state all unnecessary internal circuitry is powered down.

7.3.2 Power Supplies and Input Pins

There is a weak pulldown resistor (approximately 100 kΩ) to ground on the input pins.

7.3.3 Protection Circuits

The DRV8836 is fully protected against undervoltage, overcurrent, and overtemperature events.

7.3.3.1 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 disable. After approximately
1 ms, the bridge re-enables automatically.

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

7.3.3.2 Thermal Shutdown (TSD)

If the die temperature exceeds safe limits, all FETs in the H-bridge disable. Once the die temperature has fallen to a safe level operation automatically resumes.

7.3.3.3 Undervoltage Lockout (UVLO)

If at any time the voltage on the VCC pins 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 DRV8836 is active when the nSLEEP pin is set to a logic high. When in sleep mode, the H-bridge FETs disable (Hi-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

Two control modes are available in the DRV8836: IN/IN mode and PHASE/ENABLE mode. IN/IN mode is selected if the MODE pin is driven low or left unconnected; PHASE/ENABLE mode is selected if the MODE pin is driven to logic high. The following tables show the logic for these modes.

Table 3. IN/IN Mode

MODE xIN1 xIN2 xOUT1 xOUT2 FUNCTION
(DC MOTOR)
0 0 0 Z Z Coast
0 0 1 L H Reverse
0 1 0 H L Forward
0 1 1 L L Brake

Table 4. PHASE/ENABLE Mode

MODE xENABLE xPHASE xOUT1 xOUT2 FUNCTION
(DC MOTOR)
1 0 X L L Brake
1 1 1 L H Reverse
1 1 0 H L Forward