SLOSE83A March   2023  – January 2025 DRV8952

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
    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  Independent Half-bridge Operation
    5. 6.5  Current Sensing and Regulation
      1. 6.5.1 Current Sensing and Feedback
      2. 6.5.2 Current Sensing with External Resistor
      3. 6.5.3 Current Regulation
    6. 6.6  Charge Pump
    7. 6.7  Linear Voltage Regulator
    8. 6.8  VCC Voltage Supply
    9. 6.9  Logic Level Pin Diagram
    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 (nSLEEP = 0)
      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 Solenoid Loads
        1. 7.1.1.1 Solenoid Driver Typical Application
        2. 7.1.1.2 Thermal Calculations
          1. 7.1.1.2.1 Power Loss Calculations
          2. 7.1.1.2.2 Junction Temperature Estimation
        3. 7.1.1.3 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 Brushed-DC Motors
        1. 7.1.3.1 Brushed-DC Driver Typical Application
        2. 7.1.3.2 Power Loss Calculation
        3. 7.1.3.3 Junction Temperature Estimation
        4. 7.1.3.4 Driving Single Brushed-DC Motor
      4. 7.1.4 Driving Thermoelectric Coolers (TEC)
      5. 7.1.5 Driving Brushless DC Motors
    2. 7.2 Power Supply Recommendations
      1. 7.2.1 Bulk Capacitance
      2. 7.2.2 Power Supplies
    3. 7.3 Layout
      1. 7.3.1 Layout Guidelines
      2. 7.3.2 PCB Material Recommendation
      3. 7.3.3 Thermal Considerations
  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
  10. 9 Device and Documentation Support
    1. 9.1 Related Documentation
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1. 11.1 Tape and Reel Information

6.5.1 Current Sensing and Feedback

The DRV8952 in DDW package supports four IPROPI outputs, one for each half-bridge. The IPROPI outputs represent the current of each high-side MOSFET, as shown below -

Equation 1. IPROPI = IHS x AIPROPI

Where IHS is the current flowing through the high-side MOSFET and AIPROPI is the current mirror gain.

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. This allows the 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 IPROPI voltage should be less than the maximum recommended value of VREF, which is 3.3V.

The corresponding IPROPI voltage to the output current can be calculated as shown below -

Equation 2. VIPROPI (V) = IPROPI (A) x RIPROPI (Ω)
DRV8952 Integrated Current SensingFigure 6-1 Integrated Current Sensing

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