SLOSE83 March   2023 DRV8952

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 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1  Overview
    2. 7.2  Functional Block Diagram
    3. 7.3  Feature Description
    4. 7.4  Independent Half-bridge Operation
    5. 7.5  Current Sensing and Regulation
      1. 7.5.1 Current Sensing and Feedback
      2. 7.5.2 Current Sensing with External Resistor
      3. 7.5.3 Current Regulation
    6. 7.6  Charge Pump
    7. 7.7  Linear Voltage Regulator
    8. 7.8  VCC Voltage Supply
    9. 7.9  Logic Level Pin Diagram
    10. 7.10 Protection Circuits
      1. 7.10.1 VM Undervoltage Lockout (UVLO)
      2. 7.10.2 VCP Undervoltage Lockout (CPUV)
      3. 7.10.3 Logic Supply Power on Reset (POR)
      4. 7.10.4 Overcurrent Protection (OCP)
      5. 7.10.5 Thermal Shutdown (OTSD)
      6. 7.10.6 nFAULT Output
      7. 7.10.7 Fault Condition Summary
    11. 7.11 Device Functional Modes
      1. 7.11.1 Sleep Mode (nSLEEP = 0)
      2. 7.11.2 Operating Mode
      3. 7.11.3 nSLEEP Reset Pulse
      4. 7.11.4 Functional Modes Summary
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Driving Solenoid Loads
        1. 8.1.1.1 Solenoid Driver Typical Application
        2. 8.1.1.2 Thermal Calculations
          1. 8.1.1.2.1 Power Loss Calculations
          2. 8.1.1.2.2 Junction Temperature Estimation
        3. 8.1.1.3 Application Performance Plots
      2. 8.1.2 Driving Stepper Motors
        1. 8.1.2.1 Stepper Driver Typical Application
        2. 8.1.2.2 Power Loss Calculations
        3. 8.1.2.3 Junction Temperature Estimation
      3. 8.1.3 Driving Brushed-DC Motors
        1. 8.1.3.1 Brushed-DC Driver Typical Application
        2. 8.1.3.2 Power Loss Calculation
        3. 8.1.3.3 Junction Temperature Estimation
        4. 8.1.3.4 Driving Single Brushed-DC Motor
      4. 8.1.4 Driving Thermoelectric Coolers (TEC)
      5. 8.1.5 Driving Brushless DC Motors
  9. 9 Package Thermal Considerations
    1. 9.1 DDW Package
      1. 9.1.1 Thermal Performance
        1. 9.1.1.1 Steady-State Thermal Performance
        2. 9.1.1.2 Transient Thermal Performance
  10. 10Power Supply Recommendations
    1. 10.1 Bulk Capacitance
    2. 10.2 Power Supplies
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 PCB Material Recommendation
    3. 11.3 Thermal Considerations
  12. 12Device and Documentation Support
    1. 12.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 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

8.1.2.1 Stepper Driver Typical Application

The following schematic shows the DRV8952 driving a stepper motor.

Figure 8-4 Driving Stepper Motor with DRV8952

The full-scale current (IFS) is the maximum current driven through either winding. This quantity will depend on the VREF voltage and the resistor connected from IPROPI pin to ground (for the DDW package) or on the KV parameter (for the PWP package). The maximum allowable voltage on the VREF pins is 3.3 V. DVDD can be used to provide VREF through a resistor divider.

Note:

The IFS current must also follow Equation 5 to avoid saturating the motor. VM is the motor supply voltage, and RL is the motor winding resistance.

Equation 5. GUID-3DD1F9AE-9EC1-4E01-A720-98A0EF89BB58-low.gif

If the target motor speed is too high, the motor will not spin. Make sure that the motor can support the target speed.

For a desired motor speed (v), microstepping level (nm), and motor full step angle (θstep), determine the frequency of the input waveform as follows -

Equation 6. GUID-BD4BA16A-9F42-4D19-87AB-E48D54AA15D9-low.gif

θstep can be found in the stepper motor data sheet or written on the motor itself.

The frequency ƒstep gives the frequency of input change on the DRV8952. 1/ ƒstep = tSTEP on the diagram below. Equation 7 shows an example calculation for a 120 rpm target speed and 1/2 step.

Equation 7. GUID-8B3B4AE0-41E9-43FC-945E-D0BF6B40EF22-low.gif
Figure 8-5 Example 1/2 Stepping Operation

For the DDW package, connect the IPROPI outputs corresponding to the same H-bridge together. IPROPI1 and IPROPI2, when connected together, reprsent the current of coil A of the stepper (connected between OUT1 and OUT2) during drive and slow-decay (high-side recirculation) modes. Similarly, IPROPI3 and IPROPI4, connected together, will reprsent coil B current. When two IPROPI pins are connected together, the effective current mirror gain will be 424 μA/A typical. The resistor from the combined IPROPI pin to ground should be selected accordingly.