ZHCSCX5A October   2014  – November 2015 DRV8848

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 修订历史记录
  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 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 PWM Motor Drivers
      2. 7.3.2 Bridge Control
      3. 7.3.3 Parallel Operation
      4. 7.3.4 Current Regulation
      5. 7.3.5 Current Recirculation and Decay Modes
      6. 7.3.6 Protection Circuits
        1. 7.3.6.1 OCP
        2. 7.3.6.2 TSD
        3. 7.3.6.3 UVLO
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Current Regulation
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Bulk Capacitance Sizing
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 社区资源
    2. 11.2 商标
    3. 11.3 静电放电警告
    4. 11.4 Glossary
  12. 12机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

8.1 Application Information

The DRV8848 is used in stepper or brushed DC motor control.

8.2 Typical Application

The user can configure the DRV8848 with the following design procedure.

DRV8848 typ_app_LLSEL7.gif Figure 10. Typical Application Schematic

8.2.1 Design Requirements

Table 4 gives design input parameters for system design.

Table 4. Design Parameters

DESIGN PARAMETER REFERENCE EXAMPLE VALUE
Nominal supply voltage VVM 12 V
Supply voltage range 4 to 18 V
Motor winding resistance RL 3 Ω/phase
Motor winding inductance LL 330 µH/phase
Target chopping current ICHOP 500 mA
Chopping current reference voltage VVREF 3.3 V

8.2.2 Detailed Design Procedure

8.2.2.1 Current Regulation

The chopping current (ICHOP) is the maximum current driven through either winding. This quantity depends on the sense resistor value (RXISEN).

Equation 2. DRV8848 eq_2__Ichop_LLSEL7.gif

ICHOP is set by a comparator which compares the voltage across RXISEN to a reference voltage. Note that ICHOP must follow Equation 3 to avoid saturating the motor.

Equation 3. DRV8848 eq_3_Ichop_LLSEL7.gif

where

  • VVM is the motor supply voltage.
  • RL is the motor winding resistance.

8.2.3 Application Curves

DRV8848 app_I_reg_llsel7.gif
Figure 11. Current Regulation
DRV8848 app_step_mode_llsel7.gif
Figure 12. Stepper Mode Operation