ZHCSMT3A november   2020  – march 2023 ALM2403-Q1

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  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 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 Overtemperature and Shutdown Pin (OTF/SH_DN)
      2. 7.3.2 Thermal Shutdown
      3. 7.3.3 Current-Limit and Short-Circuit Protection
      4. 7.3.4 Input Common-Mode Range
      5. 7.3.5 Reverse Body Diodes in Output-Stage Transistors
      6. 7.3.6 EMI Filtering
    4. 7.4 Device Functional Modes
      1. 7.4.1 Open-Loop and Closed-Loop Operation
      2. 7.4.2 Shutdown
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Capacitive Load and Stability
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Resolver Excitation Amplifier Combined With MFB 2nd-Order, Low-Pass Filter
          1. 8.2.2.1.1 Filter Design
          2. 8.2.2.1.2 Short-to-Battery Protection
        2. 8.2.2.2 Power Dissipation and Thermal Reliability
          1. 8.2.2.2.1 Improving Package Thermal Performance
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  9. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 接收文档更新通知
    3. 9.3 支持资源
    4. 9.4 Trademarks
    5. 9.5 静电放电警告
    6. 9.6 术语表
  10. 10Mechanical, Packaging, and Orderable Information

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

The corner frequency of the 2nd-order MFB filter is set to approximately twenty times less than the PWM frequency. The corner frequency defined at –3 dB is shown in Equation 1.

Equation 1. f p = 1 2   ×   π   ×   R 3   ×   C 3   ×   R 2   ×   C 2

The 2nd-order MFB active filter uses an inverted input topology and the op amp gain is determined by the ratios of resistors R2 and R1:

Equation 2. G a i n = - R 2 R 1

The gain settings are based on the output drive requirements and PWM signal amplitude. With different gain settings, the filter characteristics, such as rolloff, can change. The design must be fine-tuned to meet optimal performance needs.

The quality (Q) factor of the low-pass filter is configured with Q = 1. The purpose of designing for this Q factor is to minimize attenuation around the corner frequency of 10 kHz, thus extending the pass-band gain. The Q factor of the 2nd-order MFB filter is given by Equation 3:

Equation 3. Q =   C 2   / C 3 R 3   / R 2   +   R 2   / R 3   +   R 3   ×   R 2 / R 1