JAJSJV4 November   2020 THVD8010

PRODUCTION DATA  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  4. 4 Revision History
  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 ESD Ratings - IEC Specifications
    4. 6.4 Recommended Operating Conditions
    5. 6.5 Thermal Information
    6. 6.6 Electrical Characteristics
    7. 6.7 Power Dissipation Characteristics
    8. 6.8 Switching Characteristics
    9. 6.9 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1 OOK Modulation with F_SET pin
      2. 8.3.2 OOK Demodulation
      3. 8.3.3 Transmitter Timeout
      4. 8.3.4 Polarity Free Operation
      5. 8.3.5 Glitch Free Mode Change
      6. 8.3.6 Integrated IEC ESD and EFT Protection
    4. 8.4 Device Functional Modes
      1. 8.4.1 OOK Mode
      2. 8.4.2 Thermal shutdown (TSD)
  9. 9 Application and implementation
    1. 9.1 Application information
    2. 9.2 Typical application (OOK mode)
      1. 9.2.1 Design requirements
        1. 9.2.1.1 Carrier frequency
      2. 9.2.2 Detailed design procedure
        1. 9.2.2.1 Inductor value selection
        2. 9.2.2.2 Capacitor value selection
      3. 9.2.3 Application Curves
  10. 10Power supply recommendations
  11. 11Layout
    1. 11.1 Layout guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
    2. 12.2 ドキュメントの更新通知を受け取る方法
    3. 12.3 サポート・リソース
    4. 12.4 Trademarks
    5. 12.5 静電気放電に関する注意事項
    6. 12.6 用語集
  13. 13Mechanical, 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

9.2.2.2 Capacitor value selection

Capacitor selection is easier than inductor selection, primarily because capacitance impedance is important to allow higher frequency signals through. However, the capacitor ratings for voltage must be carefully selected to meet the application requirements. Special considerations for hot plug nodes should be made to ensure that voltage transients during hot plugging do not exceed the absolute maximum values. See Section 6.1.

The number of nodes on the bus does not play into the capacitance calculation. The impedance of a capacitor is shown in Equation 4.

Equation 4. GUID-4BB1CF5C-EDE7-4D26-BAA7-8FD195A29DBB-low.gif

Maintaining Z ≤ 5 Ω keeps the impedance low enough at the carrier frequency to allow data to pass through. If the equation is rearranged to calculate C, the result is shown in Equation 5.

Equation 5. GUID-0682CE2D-D8FA-47E6-83DE-C21FC259333D-low.gif

If the previous example of a 300 kHz carrier frequency is used, then a minimum capacitance value of about 106 nF. For a quick reference, refer to Figure 9-3.