SLVSHB2 February   2024 DRV8262-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
      1. 5.4.1 Transient Thermal Impedance & Current Capability
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1  Overview
    2. 6.2  Functional Block Diagram
    3. 6.3  Feature Description
    4. 6.4  Device Operational Modes
      1. 6.4.1 Dual H-Bridge Mode (MODE1 = 0)
      2. 6.4.2 Single H-Bridge Mode (MODE1 = 1)
    5. 6.5  Current Sensing and Regulation
      1. 6.5.1 Current Sensing and Feedback
      2. 6.5.2 Current Regulation
        1. 6.5.2.1 Mixed Decay
        2. 6.5.2.2 Smart tune Dynamic Decay
      3. 6.5.3 Current Sensing with External Resistor
    6. 6.6  Charge Pump
    7. 6.7  Linear Voltage Regulator
    8. 6.8  VCC Voltage Supply
    9. 6.9  Logic Level, Tri-Level and Quad-Level Pin Diagrams
    10. 6.10 Protection Circuits
      1. 6.10.1 VM Undervoltage Lockout (UVLO)
      2. 6.10.2 VCP Undervoltage Lockout (CPUV)
      3. 6.10.3 Logic Supply Power on Reset (POR)
      4. 6.10.4 Overcurrent Protection (OCP)
      5. 6.10.5 Thermal Shutdown (OTSD)
      6. 6.10.6 nFAULT Output
      7. 6.10.7 Fault Condition Summary
    11. 6.11 Device Functional Modes
      1. 6.11.1 Sleep Mode
      2. 6.11.2 Operating Mode
      3. 6.11.3 nSLEEP Reset Pulse
      4. 6.11.4 Functional Modes Summary
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Driving Brushed-DC Motors
        1. 7.1.1.1 Brushed-DC Motor Driver Typical Application
        2. 7.1.1.2 Power Loss Calculations - Dual H-bridge
        3. 7.1.1.3 Power Loss Calculations - Single H-bridge
        4. 7.1.1.4 Junction Temperature Estimation
        5. 7.1.1.5 Application Performance Plots
      2. 7.1.2 Driving Stepper Motors
        1. 7.1.2.1 Stepper Driver Typical Application
        2. 7.1.2.2 Power Loss Calculations
        3. 7.1.2.3 Junction Temperature Estimation
      3. 7.1.3 Driving Thermoelectric Coolers (TEC)
  9. 8 Package Thermal Considerations
    1. 8.1 DDW Package
      1. 8.1.1 Thermal Performance
        1. 8.1.1.1 Steady-State Thermal Performance
        2. 8.1.1.2 Transient Thermal Performance
    2. 8.2 PCB Material Recommendation
  10. 9 Power Supply Recommendations
    1. 9.1 Bulk Capacitance
    2. 9.2 Power Supplies
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  12. 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 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information
    1. 13.1 Tape and Reel Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.5.1 Current Sensing and Feedback

The device supports one IPROPI output when operating in the single H-bridge mode, and two IPROPI outputs when operating in the dual H-bridge mode.

The IPROPI pins output a current that is proportional to the current flowing in the high-side FETs of the H-bridge, scaled by the current mirror gain AIPROPI. The IPROPI output current can be calculated by Equation 1. The IHS1 and IHS2 in Equation 1 are only valid when the current flows from drain to source in the high-side MOSFET. If current flows from source to drain, the value of IHS1 and IHS2 for that channel is zero. Because of this, the IPROPI pin does not represent the current when operating in a fast decay mode (coast mode) or low-side slow decay mode. The IPROPI pin represents the H-bridge current under forward drive, reverse drive, and high-side slow decay, thereby allowing for continuous current monitoring in typical brushed DC motor applications.

Even in coast mode, the current can be sampled by briefly re-enabling the driver in either drive or slow-decay modes and measuring the current before switching back to coast mode again.

Equation 1. IPROPI = (IHS1 + IHS2) x AIPROPI

Each IPROPI pin should be connected to an external resistor (RIPROPI) to ground in order to generate a proportional voltage (VIPROPI) on the IPROPI pin with the IIPROPI analog current output. This allows for the load current to be measured as the voltage drop across the RIPROPI resistor with a standard analog to digital converter (ADC). The RIPROPI resistor can be sized based on the expected load current in the application so that the full range of the controller ADC is utilized. The device implements an internal clamp circuit to limit VIPROPI with respect to VVREF on the VREF pin and protect the external ADC in case of output overcurrent or unexpected high current events.

The corresponding IPROPI voltage to the output current can be calculated by Equation 2.

Equation 2. VIPROPI (V) = IPROPI (A) x RIPROPI (Ω)

The IPROPI voltage should be less than the maximum recommended value of VREF, which is 3.3V. For the RIPROPI resistor, 10%, 5%, 1% and 0.1% are all valid tolerance values. The typical recommendation is 1% for best trade off between performance and cost.

GUID-20220608-SS0I-S463-82BZ-QLR7X9J04MZW-low.svgFigure 6-4 Integrated Current Sensing

The AERR parameter in the Electrical Characteristics table is the error of the AIPROPI gain. It indicates the combined effect of offset error added to the IOUT current and gain error.