ZHCS819G March   2012  – March 2018 DRV110

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      DRV110 由电源线电压供电
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
    1.     Pin 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 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 Keep Time
      2. 7.3.2 PWM Current Control
      3. 7.3.3 Configuring Peak and Hold Currents
      4. 7.3.4 Configuring the PWM Frequency
      5. 7.3.5 Voltage Supply and Integrated Zener Diode
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Mode
      2. 7.4.2 Shutdown
  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 Limiting Resistor Selection
        2. 8.2.2.2 Passive Component Selection
      3. 8.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 文档支持
      1. 11.1.1 相关文档
    2. 11.2 接收文档更新通知
    3. 11.3 社区资源
    4. 11.4 商标
    5. 11.5 静电放电警告
    6. 11.6 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

8.2.2.2 Passive Component Selection

With the selected peak current, hold current, and peak keep time values, the values of RPEAK, RHOLD (for 14-pin package), CKEEP, and RSENSE can be determined. Table 4 lists the example values and results from calculation.

Table 4. Example Application Values When RSENSE = 1 Ω

VARIABLE VALUE 14-PIN VALUES 8-PIN VALUES CALCULATED FROM
Peak current 150 mA RPEAK = 400 kΩ RPEAK = 400 kΩ Equation 2
Hold current 50 mA RHOLD = 200 kΩ or
connect HOLD to ground		 Default Equation 3
Keep time 100 ms CKEEP = 1 µF CKEEP = 1 µF Equation 1
PWM frequency 20 kHz ROSC = Shorted to ground ROSC = Shorted to ground Equation 4

Use Equation 2 and Equation 3 to calculate the values of the RPEAK resistor and RHOLD (if applicable) resistor. For the sample values, the RPEAK resistor is set to 400 kΩ and the RHOLD resistor is shorted to GND. TI recommends using a 0-Ω resistor for prototyping in case changes to this value are desired.

Next, select the value of the CKEEP capacitor based on Equation 1. For the sample value, the CKEEP capacitor is set to 1 µF. The ROSC resistor is initially be shorted to GND, but a 0-Ω resistor is also recommended for prototyping. Additionally, a low-pass filter on the SENSE line can be added in a high-noise environment and is recommended for prototyping. The typical value for the low pass filter resistor is 1 kΩ and the typical value for the filter capacitor is 100 pF.

The value of sense resistor can be selected based on the preference of the designer. The only restriction is that the voltage across the sense resistor (found by the RSENSE resistance times the IHOLD current) must be greater than 30 mV for reliable operation.

The external FET and current recirculation diode must be selected based on the current values defined in Table 4 and the supply voltage. The current recirculation diode should be a fast recovery diode.