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

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

7.3.3 Parallel Operation

The two drivers can be used in parallel to deliver twice the current to a single motor. To enter parallel mode in DRV8421A, the 4-wire input version, the following actions must be taken (refer to Figure 7-7):

  1. IN1 and IN3 must be tied together
  2. IN2 and IN4 must be tied together
  3. OUT1 and OUT3 must be tied together
  4. OUT2 and OUT4 must be tied together

To exit parallel mode, all inputs must be made independent and the device must be powered-up.

Table 7-3 Parallel Mode Operation: DRV8421A (4-wire input)
Inputs Outputs Function
IN1 IN2 IN3 IN4 OUT1 OUT2 OUT3 OUT4
0 0 0 0 Off Off Off Off Standby (Hi-Z)
1 0 1 0 1 0 1 0 Forward
0 1 0 1 0 1 0 1 Reverse
1 1 1 1 0 0 0 0 Brake
DRV8421 Parallel Mode Operation: DRV8421A Figure 7-7 Parallel Mode Operation: DRV8421A

For the DRV8421B, the 2-wire input version, parallel mode operation can be achieved by taking the following steps (refer to Figure 7-8):

  1. IN1 and IN2 must be tied together
  2. OUT1 and OUT3 must be tied together
  3. OUT2 and OUT4 must be tied together

To exit parallel mode, all inputs must be made independent and the device must be powered-up.

Table 7-4 Parallel Mode Operation: DRV8421B (2-wire input)
Inputs Outputs Function
EN IN1 IN2 OUT1 OUT2 OUT3 OUT4
L X X Off Off Off Off Standby/Low Power Sleep Mode
H L L H L H L Forward
H H L H L H Reverse
Note:

Providing 50% duty cycle to IN1/IN2 tied together will stop the motor in DRV8421B Parallel Mode. To move forward, provide a duty cycle lower than 50%. To move reverse, provide a duty cycle higher than 50%.

DRV8421 Parallel Mode Operation: DRV8421B Figure 7-8 Parallel Mode Operation: DRV8421B