ZHCSHZ0A April 2018 – July 2018 DRV8306
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Three Phase Smart Gate Drivers
- 7.3.2 DVDD Linear Voltage Regulator
- 7.3.3 Pulse-by-Pulse Current Limit
- 7.3.4 Hall Comparators
- 7.3.5 FGOUT Signal
- 7.3.6 Pin Diagrams
- 7.3.7 Gate-Driver Protective Circuits
- 7.4 Device Functional Modes
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文檔支持
- 12機械、封裝和可訂購信息
9.1 Bulk Capacitance Sizing
Having appropriate local bulk capacitance is an important factor in motor drive system design. It is generally beneficial to have more bulk capacitance, while the disadvantages are increased cost and physical size. The amount of local capacitance depends on a variety of factors including:
- The highest current required by the motor system
- The power supply's type, capacitance, and ability to source current
- The amount of parasitic inductance between the power supply and motor system
- The acceptable supply voltage ripple
- Type of motor (brushed DC, brushless DC, stepper)
- The motor startup and braking methods
The inductance between the power supply and motor drive system will limit the rate current can change from the power supply. If the local bulk capacitance is too small, the system will respond to excessive current demands or dumps from the motor with a change in voltage. When adequate bulk capacitance is used, the motor voltage remains stable and high current can be quickly supplied.
The data sheet provides a recommended minimum value, but system level testing is required to determine the appropriate sized bulk capacitor.
Figure 43. Motor Drive Supply Parasitics Example