SLVSFV5A july   2023  – july 2023 DRV8262

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
      1. 6.4.1 Transient Thermal Impedance & Current Capability
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1  Overview
    2. 7.2  Functional Block Diagram
    3. 7.3  Feature Description
    4. 7.4  Device Operational Modes
      1. 7.4.1 Dual H-Bridge Mode (MODE1 = 0)
      2. 7.4.2 Single H-Bridge Mode (MODE1 = 1)
    5. 7.5  Current Sensing and Regulation
      1. 7.5.1 Current Sensing and Feedback
      2. 7.5.2 Current Regulation
        1. 7.5.2.1 Mixed Decay
        2. 7.5.2.2 Smart tune Dynamic Decay
      3. 7.5.3 Current Sensing with External Resistor
    6. 7.6  Charge Pump
    7. 7.7  Linear Voltage Regulator
    8. 7.8  VCC Voltage Supply
    9. 7.9  Logic Level, Tri-Level and Quad-Level Pin Diagrams
    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
      2. 7.11.2 Operating Mode
      3. 7.11.3 nSLEEP Reset Pulse
      4. 7.11.4 Functional Modes Summary
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Driving Brushed-DC Motors
        1. 8.1.1.1 Brushed-DC Motor Driver Typical Application
        2. 8.1.1.2 Power Loss Calculations - Dual H-bridge
        3. 8.1.1.3 Power Loss Calculations - Single H-bridge
        4. 8.1.1.4 Junction Temperature Estimation
        5. 8.1.1.5 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 Thermoelectric Coolers (TEC)
  10. 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
    2. 9.2 DDV Package
    3. 9.3 PCB Material Recommendation
  11. 10Power Supply Recommendations
    1. 10.1 Bulk Capacitance
    2. 10.2 Power Supplies
  12. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  13. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 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
  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

7.5.2 Current Regulation

The current chopping threshold (ITRIP) is set through a combination of the VREF voltage (VVREF) and IPROPI output resistor (RIPROPI). This is done by comparing the voltage drop across the external RIPROPI resistor to VVREF with an internal comparator.

Equation 3. ITRIP x AIPROPI = VVREF (V) / RIPROPI (Ω)

For example, in the dual H-bridge mode, to set ITRIP at 5 A with VVREF at 3.3V, RIPROPI has to be -

RIPROPI = VVREF / (ITRIP x AIPROPI ) = 3.3 / (5 x 212 x 10-6) = 3.09 kΩ

In the single H-bridge mode, connect the two IPROPI pins together. In the dual H-bridge mode, there are two VREF pins, which allows setting separate current chopping threshold for each brushed-DC motor.

The internal current regulation can be disabled by tying IPROPI to GND and setting the VREF pin voltage greater than GND (if current feedback is not required). If current feedback is required and current regulation is not required, set VVREF and RIPROPI such that VIPROPI never reaches the VVREF threshold.

GUID-20220608-SS0I-XT34-DGG9-WCP6VLXGDGSF-low.svg Figure 7-5 Current Regulation

The current through the motor windings is regulated by an adjustable off-time PWM current regulation circuit. During PWM current chopping, the H-bridge is enabled to drive through the motor winding until the PWM current chopping threshold is reached.

When the ITRIP current has been reached, for single BDC or dual BDC applications, with the DECAY pin grounded, the device enforces slow current decay by enabling both the high-side FETs for a time of tOFF, programmed by the TOFF pin.

When the tOFF time has elapsed and the current level falls below the current regulation (ITRIP) level, the output is re-enabled according to the inputs. If, after the tOFF time has elapsed, the current is still higher than the ITRIP level, the device enforces another tOFF time period of the same duration. This "double tOFF" time continues until current is less than ITRIP at the end of tOFF time.

While in current regulation, the inputs can be toggled to drive the load in the opposite direction to decay the current faster. For example, if the load was in forward drive prior to entering current regulation it can only go into reverse drive when the driver enforces current regulation.

For single or dual-BDC applications, the DECAY pin should be kept grounded for high-side slow decay during tOFF. For stepper applications, DECAY pin voltage should be according to the desired decay mode. The decay mode is selected by the DECAY pin as shown in Table 7-7.

Table 7-7 Decay Mode Settings
DECAY DECAY MODE

0

Slow decay (brake or high-side re-circulation)
1 Smart tune dynamic decay
Hi-Z Mixed decay: 30% fast

If the state of the INx control pin inputs changes during the tOFF time, the remainder of the tOFF time is ignored, and the outputs will again follow the inputs. This is shown in Figure 7-6.

GUID-0FFB654F-8865-4FA5-B464-E48BDD910B04-low.gifFigure 7-6 Current Regulation

As shown in Table 7-8, the TOFF pin configures the PWM OFF time. The OFF time settings can be changed on the fly.

Table 7-8 Off-Time Settings
TOFF OFF-TIME (tOFF)
0 7 µs
1 16 µs
Hi-Z 24 µs
330 kΩ to GND 32 µs