SLVSHA4 June   2024 DRV8421

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings Comm
    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
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 PWM Motor Drivers
      2. 7.3.2 Truth Tables
      3. 7.3.3 Parallel Operation
      4. 7.3.4 Protection Circuits
        1. 7.3.4.1 OCP
        2. 7.3.4.2 TSD
        3. 7.3.4.3 UVLO
    4. 7.4 Device Functional Modes
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Application Curves
    3. 8.3 Power Supply Recommendations
      1. 8.3.1 Bulk Capacitance Sizing
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Community Resources
    2. 9.2 Trademarks
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

7.3.4.3 UVLO

If at any time the voltage on the VM pin falls below the UVLO falling threshold voltage, VUVLO, all circuitry in the device is disabled, and all internal logic is reset. Operation resumes when VVM rises above the UVLO rising threshold. In DRV8421B, the nFAULT pin is driven low during an undervoltage condition and is released after operation has resumed.

Table 7-5 Fault Handling
FAULT ERROR REPORT H-BRIDGE INTERNAL CIRCUITS RECOVERY
VM undervoltage (UVLO) nFAULT unlatched (DRV8421B only) Disabled Shut down System and fault clears on recovery
Overcurrent (OCP) nFAULT unlatched (DRV8421B only) Disabled Operating System and fault clears on recovery and motor is driven after time, tRETRY
Thermal shutdown (TSD) nFAULT unlatched (DRV8421B only) Disabled Operating System and fault clears on recovery